2026-03-16 15:53:44 +01:00
49 changed files with 6587 additions and 414 deletions
--- a/.claude/settings.json
+++ b/.claude/settings.json
@@ -0,0 +1,7 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash"
+    ]
+  }
+}
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog

+## [Unreleased]
+### Docs
+- Added `docs/ISSUE-279-I18N-MVP-CLOSEOUT.md` with the issue #279 i18n MVP close-out note, including migration impact, reusable release-note text, and a release-readiness checklist refreshed against `main@1bc4c27` after PR #282/#283 landed on 2026-03-13 UTC.
+- Clarified that the close-out note supersedes earlier PR snapshot assumptions and now treats PR #282 (`6ad5430`) and PR #283 (`1bc4c27`) as already merged on `main`.
+
 ## [0.1.0] - 2026-02-27
 ### Added
 - Projekt scaffold for Weirsøe Party Protocol (Django 6.0.2)
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -0,0 +1,119 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+**Weirsøe Party Protocol** is a Danish party game web platform (Jackbox-style) where games display on a primary screen and players participate via mobile. The MVP game is "Fup og Fakta" (a Fibbage-style lie-and-guess game).
+
+- Backend: Django 6.0.2 + Django Channels (WebSockets) + Redis
+- Frontend: Angular 19 shell + shared TypeScript API client library
+- Database: MySQL (SQLite fallback for dev)
+- Deployment: Proxmox LXC containers (not Docker)
+
+## Commands
+
+### Backend (Django)
+```bash
+python manage.py runserver       # Dev server
+python manage.py migrate         # Apply migrations
+python manage.py test            # Run all backend tests
+python manage.py test lobby      # Run tests for a single app
+python manage.py shell           # Django shell
+```
+
+### Frontend — API client (`/frontend`)
+```bash
+cd frontend
+npm install
+npm test       # Vitest unit tests
+npm run build  # TypeScript compile check (--noEmit)
+```
+
+### Frontend — Angular shell (`/frontend/angular`)
+```bash
+cd frontend/angular
+npm install
+npm start      # Dev server (ng serve)
+npm run build  # Production build
+npm run test   # Vitest unit tests
+```
+
+### i18n validation
+```bash
+python scripts/check_i18n_drift.py   # Check for key drift between locales
+```
+
+## Architecture
+
+### Backend apps
+
+| App | Purpose |
+|-----|---------|
+| `partyhub/` | Main Django project — settings, root URLs, ASGI/WSGI, i18n bootstrap |
+| `lobby/` | Session & player management — create/join session, locale-aware error responses |
+| `fupogfakta/` | Game logic — all domain models, score calculation (server-authoritative) |
+| `realtime/` | WebSocket event layer (stub) |
+| `voice/` | Voice/TTS interface (stub, Phase 2) |
+| `core_admin/` | Health endpoint (`/healthz`), global admin |
+
+**Key domain models** (all in `fupogfakta/models.py`): `GameSession`, `Player`, `Category`, `Question`, `RoundConfig`, `RoundQuestion`, `LieAnswer`, `Guess`, `ScoreEvent`.
+
+Score calculation is server-side only. `ScoreEvent` provides an auditable trail of all point changes.
+
+### Frontend layers
+
+1. **Shared API client** (`frontend/src/`) — pure TypeScript, framework-agnostic. Defines all API types (`api/types.ts`) and HTTP client abstraction (`api/client.ts`).
+2. **Angular shell** (`frontend/angular/`) — Angular 19 standalone components (no NgModules), hash-based routing. `host-shell.component` for the presenter screen; `player-shell.component` for mobile players.
+
+The Angular shell consumes the shared client via `frontend/src/api/angular-client.ts`.
+
+### Real-time flow
+
+`LOBBY → LIE → GUESS → REVEAL → FINISHED` — phase transitions broadcast a `PhaseViewModel` to all connected clients via WebSocket. Clients are read-only; only the server is authoritative for state.
+
+### i18n
+
+- **Single source of truth**: `shared/i18n/lobby.json` (keys in both `en` and `da`)
+- Loaded once at startup with LRU cache (`partyhub/i18n_bootstrap.py`)
+- Key naming: domain-first — `frontend.ui.host.*`, `frontend.ui.player.*`, `backend.errors.*`, `backend.error_codes.*`
+- Locale resolved from `Accept-Language` header; missing key returns key + logs warning; missing translation falls back to `en`
+
+## Key Conventions
+
+### Errors
+Backend error responses use stable machine-readable codes (`backend.error_codes.*`) with separately localized messages. Never couple error code strings to locale.
+
+### Game constraints (MVP)
+- 3–12 players per session
+- Session codes: 6-char alphanumeric (no 0/O/1/I/L)
+- Anti-cheat: no duplicate lies, lies cannot match the correct answer, answer order randomized
+
+### Git workflow
+- `main`: stable baseline
+- `feature/<name>`: development branches
+- `release/vX.Y.Z`: release preparation
+- Release: merge → create release branch → update `VERSION` + `CHANGELOG.md` → tag → push
+
+### TypeScript
+Strict mode required. Target ES2022. API response interfaces in `frontend/src/api/types.ts` must match backend responses exactly.
+
+### Database
+Use `ForeignKey` with explicit `on_delete` (`PROTECT`/`CASCADE`/`SET_NULL`). Add `db_index=True` on frequently queried fields. Migrations are auto-generated by Django and versioned in `migrations/`.
+
+## Environment Variables
+
+```
+DJANGO_SECRET_KEY, DJANGO_DEBUG, DJANGO_ALLOWED_HOSTS
+DB_ENGINE, DB_NAME, DB_USER, DB_PASSWORD, DB_HOST, DB_PORT
+CHANNEL_REDIS_HOST, CHANNEL_REDIS_PORT
+USE_SPA_UI (fallback: WPP_SPA_ENABLED)
+WPP_SPA_ASSET_BASE, WPP_SPA_ASSET_VERSION
+```
+
+## Test Files of Note
+
+- `lobby/tests.py` — comprehensive Django TestCase coverage for session/player/i18n/error flows
+- `frontend/angular/src/app/api-contract-smoke.spec.ts` — API contract smoke tests
+- `frontend/angular/src/app/lobby-i18n.spec.ts` — i18n parity checks
+- `frontend/tests/lobby-loader.parity.test.ts` — shared i18n loader parity
--- a/PROMPT.md
+++ b/PROMPT.md
@@ -0,0 +1,71 @@
+# Ralph Loop: Implement WebSocket push for Weirsøe Party Protocol
+
+## Context
+- Project: /home/agw/projects/weirsoe-party-protocol
+- Backend: Django 6.0.2 + Django Channels + Redis
+- The full game REST flow is already implemented in lobby/views.py
+  (create_session, join_session, start_round, show_question, submit_lie,
+  mix_answers, submit_guess, calculate_scores, reveal_scoreboard, finish_game)
+- realtime/ app exists but is a stub (no consumers.py, no routing)
+- partyhub/settings.py has channels in INSTALLED_APPS but no CHANNEL_LAYERS or routing
+- PO hard requirement: WebSocket push is mandatory in MVP (no polling)
+
+## What to build
+
+### 1. realtime/consumers.py — GameConsumer
+- AsyncJsonWebsocketConsumer
+- Connects to group game_{session_code} on connect (session_code from URL)
+- Player auth: session_token query param validated against Player model
+- Host auth: query param role=host, no token required for MVP
+- On disconnect: clean leave from group
+- Handles incoming message type "ping" -> replies with {"type": "pong"}
+- Forwards broadcast group events to WebSocket client
+
+### 2. partyhub/settings.py — CHANNEL_LAYERS
+Add CHANNEL_LAYERS using channels_redis.core.RedisChannelLayer.
+Read CHANNEL_REDIS_HOST (default 127.0.0.1) and CHANNEL_REDIS_PORT (default 6379) from env.
+
+### 3. partyhub/asgi.py — ASGI routing
+Wire URLRouter so ws/game/<session_code>/ routes to GameConsumer.
+Keep existing HTTP routing intact.
+
+### 4. realtime/routing.py
+Define websocket_urlpatterns list.
+
+### 5. realtime/broadcast.py — broadcast helper
+- async def broadcast_phase_event(session_code, event_type, payload)
+  Sends to group game_{session_code} via channel layer.
+- def sync_broadcast_phase_event(session_code, event_type, payload)
+  Sync wrapper using async_to_sync for calling from sync REST views.
+
+### 6. lobby/views.py — hook broadcasts into phase transitions
+After each phase transition, call sync_broadcast_phase_event:
+- start_round      -> phase.lie_started   (question prompt + time limit)
+- show_question    -> phase.question_shown (question text)
+- mix_answers      -> phase.guess_started  (shuffled answers + time limit)
+- calculate_scores -> phase.scores_calculated (per-player score delta)
+- reveal_scoreboard -> phase.scoreboard   (ranked player list)
+- finish_game      -> phase.game_over     (final rankings)
+
+### 7. realtime/tests.py — basic tests
+- Connect/disconnect test using channels.testing.WebsocketCommunicator
+- Verify a broadcast reaches a connected client
+
+## Constraints
+- Keep auth simple: session_token query param for players, unauthenticated host in MVP
+- Use async_to_sync wrapper for sync REST views calling async broadcast
+- Do not break existing REST tests (python manage.py test lobby must still pass)
+- After each file written, run: python manage.py check
+- Follow existing code style in lobby/views.py
+
+## Completion criteria
+Output the exact text: WEBSOCKET COMPLETE
+
+...when ALL of the following are true:
+- realtime/consumers.py exists and handles connect/disconnect/ping
+- realtime/broadcast.py exists with sync_broadcast_phase_event
+- partyhub/settings.py has CHANNEL_LAYERS configured
+- partyhub/asgi.py routes ws/game/<code>/ to GameConsumer
+- All 6 phase transitions in lobby/views.py call sync_broadcast_phase_event
+- python manage.py check passes with no errors
+- python manage.py test lobby passes (existing tests not broken)
--- a/TODO.md
+++ b/TODO.md
@@ -37,8 +37,8 @@ Byg **Weirsøe Party Protocol**: en dansk party-webapp platform ala Jackbox, hvo
  - [x] `core_admin` (global administration)
  - [x] `fupogfakta` (Spil 1)
  - [x] `lobby` (room/session/player join flow)
-  - [x] `realtime` (channels events, game state broadcast)
-  - [x] `voice` (fælles voice-acting interface)
+  - [x] `realtime` (app-skelet oprettet — consumers/routing IKKE implementeret endnu)
+  - [x] `voice` (fælles voice-acting interface — stub)
 - [x] Miljøfiler (`.env.test`, `.env.prod` skabeloner)
 - [x] Konfig for MySQL test/prod

@@ -53,14 +53,15 @@ Byg **Weirsøe Party Protocol**: en dansk party-webapp platform ala Jackbox, hvo
 - [x] `ScoreEvent` (auditérbar pointslog)

 ### Fase 3 — Spilflow `Fup og Fakta`
- [x] Lobby: host opretter session, spillere joiner via kode
- [x] Runde starter med kategori
- [x] Spørgsmål vises -> alle skriver løgn inden X sek
- [x] System blander korrekt svar + løgne
- [x] Guessfase: alle gætter inden Z sek
- [x] Pointudregning (konfigurerbar pr. runde)
- [x] Scoreboard + næste spørgsmål/runde
- [x] Slutresultat
+- [x] Lobby: host opretter session, spillere joiner via kode (REST)
+- [x] Runde starter med kategori (REST)
+- [x] Spørgsmål vises -> alle skriver løgn inden X sek (REST)
+- [x] System blander korrekt svar + løgne (persisted i JSONField, anti-cheat dedup)
+- [x] Guessfase: alle gætter inden Z sek (REST)
+- [x] Pointudregning (konfigurerbar pr. runde, ScoreEvent audit trail)
+- [x] Scoreboard + næste spørgsmål/runde (REST)
+- [x] Slutresultat (REST)
+- [x] **WebSocket push af phase-events til host + spillere** (GameConsumer + broadcast.py, InMemoryChannelLayer i tests)

 ### Fase 4 — Voice-acting (platformkrav)
 - [ ] Definér TTS provider-interface
@@ -103,10 +104,10 @@ Byg **Weirsøe Party Protocol**: en dansk party-webapp platform ala Jackbox, hvo
 - [ ] Migrations + static + health checks

 ### Backlog — Need-to-have / Nice-to-have
- [ ] (Need-to-have) Persistér mixed svarrækkefølge pr. round question, så alle spillere ser samme rækkefølge ved reconnect/refresh
+- [x] (Need-to-have) Persistér mixed svarrækkefølge pr. round question — DONE (JSONField + migration 0003 + test)
 - [x] (Need-to-have) Tilføj spiller-auth/session-token for submit_lie (pt. baseret på player_id i payload)
 - [ ] (Nice-to-have) Endpoint til status/progress i løgnfasen (antal indsendt ud af total)
- [ ] (Need-to-have) [Fejltype: CI/lint F401] [Fil/område: core_admin/*, fupogfakta/tests.py+views.py, lobby/admin.py+models.py, realtime/*, voice/*] [Branch/PR: feature/f3-lobby-create-join, feature/fase0-mvp-fup-og-fakta, feature/lobby-mvp (ingen åbne PRs fundet)] Fjern ubrugte scaffold-imports (eller kør ruff check --fix) så quality gate kan blive grøn før merge.
+- [ ] (Need-to-have) Fjern ubrugte scaffold-imports i core_admin/*, realtime/*, voice/*, fupogfakta/views.py (kør `ruff check --fix`) så CI quality gate er grøn
 - [x] (Need-to-have) [Issue #251] Release-often lane: SPA MVP opdelt i 3 merge-klare micro-PR batches (plan + acceptance criteria dokumenteret i `docs/ISSUE-251-RELEASE-OFTEN-SPA-MVP-BATCH-PLAN.md`).
 - [ ] (Need-to-have) Rate limiting på join/submit endpoints
 - [ ] (Need-to-have) Session-kode brute-force beskyttelse
--- a/docs/ISSUE-252-REACT-FALLBACK-TRIGGERS-ARTIFACT.md
+++ b/docs/ISSUE-252-REACT-FALLBACK-TRIGGERS-ARTIFACT.md
@@ -0,0 +1,27 @@
+# ISSUE-252 Artifact — React fallback trigger criteria (delivery-blocking only)
+
+Issue: **#252**
+
+## Leveret ændring
+Dokumentationen i `docs/spa-cutover-flag.md` er opdateret med en dedikeret sektion:
+- **React fallback trigger-kriterier (kun delivery-blocking)**
+- klare **tilladelses-kriterier** (alle skal være opfyldt)
+- tydelige **scope-limits**
+- eksplicitte **ikke-tilladte** anvendelser
+
+## Acceptance mapping
+1. **Clear trigger criteria**
+   - Definerer præcist hvornår fallback er tilladt:
+     - aktiv delivery-blocking fejl i Angular SPA
+     - ingen sikker Angular-fix inden release-vinduet
+     - rollback alene er utilstrækkelig for leveringsbehovet
+     - beslutning + evidens logges eksplicit (inkl. issue/incident-reference)
+2. **Scope limits**
+   - Begrænset til delivery-blocking host/player-paths.
+   - Ingen feature-bundling eller ikke-kritiske ændringer.
+   - Midlertidig anvendelse kun i aktiv incident/release-vindue.
+3. **When fallback is allowed**
+   - Kun når alle trigger-kriterier er opfyldt og dokumenteret.
+
+## Resultat
+Issue #252 er dokumenteret med operationelle guardrails, så React fallback kun bruges i kontrollerede, leveringsblokerende situationer.
--- a/docs/ISSUE-277-SHARED-I18N-PARITY-ARTIFACT.md
+++ b/docs/ISSUE-277-SHARED-I18N-PARITY-ARTIFACT.md
@@ -0,0 +1,80 @@
+# ISSUE-277 Artifact — shared i18n registry parity report (Django ↔ Angular MVP)
+
+Issue: **#277** (`[READY][#175][P3] Shared i18n registry artifact: backend/frontend keyspace parity report`)
+
+## Artifact metadata
+
+- `artifact_id`: `issue-277-shared-i18n-parity-report`
+- `artifact_version`: `1.0`
+- `catalog_source`: `shared/i18n/lobby.json`
+- `generator`: `scripts/report_i18n_parity.py`
+
+## Naming/version rules (email-manager-inspired strategy)
+
+- **Single canonical artifact per issue**: issue-bundne rapporter navngives `docs/ISSUE-<nr>-<slug>-ARTIFACT.md`.
+- **Stable artifact identity**: `artifact_id` ændres ikke ved tekstlige opdateringer i samme rapporttype; det er den faste reference i review/ops.
+- **Explicit artifact versioning**: `artifact_version` bumpes, når rapportlogik eller scope ændres, så drift/review kan se forskel på format- vs. dataændringer.
+- **Shared namespace first**: keys refereres med fulde navnerum (`frontend.ui.*`, `frontend.errors.*`, `backend.error_codes.*`, `backend.errors.*`) i stedet for lokale aliases i artefakter.
+- **Source-of-truth before consumers**: rapporten afledes fra `shared/i18n/lobby.json`; Django/Angular beskrives som consumers af samme registry og ikke som parallelle kontrakter.
+
+## MVP-critical parity summary
+
+- Frontend UI gameplay keys checked: **16** → `OK`
+- Frontend error keys checked: **7** → `OK`
+- Backend gameplay/error codes checked: **9** → `OK`
+- Distinct frontend error keys reached from backend MVP flow: **6** (`join_failed, nickname_invalid, nickname_taken, session_code_required, session_not_found, start_round_failed`)
+
+Status: **Shared locale matrix is aligned (`en`, `da`) and backend→frontend error handling is contract-complete for MVP-critical flow.**
+
+## Django ↔ Angular parity matrix (MVP-critical error contract)
+
+| Backend code (`backend.error_codes.*`) | Django message key (`backend.errors.*`) | Angular key (`frontend.errors.*`) | Locales `en/da` | Parity note |
+|---|---|---|---|---|
+| `session_code_required` | `session_code_required` | `session_code_required` | `OK` | 1:1 |
+| `nickname_invalid` | `nickname_invalid` | `nickname_invalid` | `OK` | 1:1 |
+| `session_not_found` | `session_not_found` | `session_not_found` | `OK` | 1:1 |
+| `session_not_joinable` | `session_not_joinable` | `join_failed` | `OK` | mapped alias |
+| `nickname_taken` | `nickname_taken` | `nickname_taken` | `OK` | 1:1 |
+| `category_slug_required` | `category_slug_required` | `start_round_failed` | `OK` | many:1 collapse |
+| `category_not_found` | `category_not_found` | `start_round_failed` | `OK` | many:1 collapse |
+| `round_start_invalid_phase` | `round_start_invalid_phase` | `start_round_failed` | `OK` | many:1 collapse |
+| `round_already_configured` | `round_already_configured` | `start_round_failed` | `OK` | many:1 collapse |
+
+## Scope notes
+
+- **Django** consumes backend codes/messages directly from `shared/i18n/lobby.json` via `lobby/i18n.py`.
+- **Angular** consumes the same registry via `frontend/shared/i18n/lobby-loader.ts` and runtime helpers in `frontend/angular/src/app/lobby-i18n.ts`.
+- **Parity in MVP** is therefore strongest on the shared error contract and locale matrix; gameplay UI labels are frontend-owned but still live in the same registry.
+
+## Verified MVP gameplay UI keyspace present in the shared registry
+
+- `frontend.ui.host.title`
+- `frontend.ui.player.title`
+- `frontend.ui.common.session_code`
+- `frontend.ui.player.nickname`
+- `frontend.ui.player.join`
+- `frontend.ui.host.start_round`
+- `frontend.ui.host.show_question`
+- `frontend.ui.player.lie_label`
+- `frontend.ui.player.submit_lie`
+- `frontend.ui.player.submit_guess`
+- `frontend.ui.host.mix_answers`
+- `frontend.ui.host.calculate_scores`
+- `frontend.ui.host.load_scoreboard`
+- `frontend.ui.host.final_leaderboard`
+- `frontend.ui.player.final_leaderboard`
+- `frontend.ui.common.points_short`
+
+## Concrete deviations / follow-up items
+
+1. **Error granularity collapse remains intentional**: backend codes `category_slug_required, category_not_found, round_start_invalid_phase, round_already_configured` all map to `frontend.errors.start_round_failed`. Follow-up only if product wants case-specific Angular copy instead of one shared host failure message.
+2. **Frontend-only fallback copy is not mirrored in Django**: `frontend.errors.unknown` and `frontend.errors.session_fetch_failed` are Angular-side resilience keys, not backend contract keys. Follow-up if API responses should expose stable backend equivalents for these states.
+3. **Gameplay UI labels are registry-shared but not backend-rendered**: `frontend.ui.host.*`, `frontend.ui.player.*`, and `frontend.ui.common.*` are available in the shared artifact, but Django currently consumes only the backend error slice. Follow-up only if server-rendered views must guarantee the same UI label surface as Angular.
+
+## Re-run
+
+```bash
+python3 scripts/check_i18n_drift.py
+python3 scripts/report_i18n_parity.py
+python3 scripts/check_i18n_parity_artifact.py
+```
--- a/docs/ISSUE-278-SMOKE-E2E-GATE-ARTIFACT.md
+++ b/docs/ISSUE-278-SMOKE-E2E-GATE-ARTIFACT.md
@@ -0,0 +1,36 @@
+# Issue #278 Artifact — smoke/e2e gate for da+en locale flow and primary-only audio
+
+## Scope
+Acceptance for `[READY][#175][P4]`:
+1. Verify one MVP host+player smoke run in `en`.
+2. Verify one MVP host+player smoke run in `da`.
+3. Verify audio routing remains `primary-device only` so phone/player clients never take playback ownership.
+
+Dette er en gate-/evidensleverance. Ingen ny produktfunktion ud over test/verifikation.
+
+## Implemented smoke gate
+Angular smoke spec: `frontend/angular/src/app/i18n-mvp-flow-smoke.spec.ts`
+
+The gate now runs two explicit locale scenarios:
+- `en`: host refresh/start-round copy + player submit-guess copy
+- `da`: samme flow med dansk copy
+
+Audio-policy delen af samme smoke-spec verificerer:
+- host/primary playback path er uændret før player mount
+- player mount installerer no-audio guard på secondary device
+- guard fjernes igen ved unmount, så primary path fortsat er eneste aktive output
+
+## Recommended verification command
+Køres fra `frontend/angular`:
+
+```bash
+npm test -- --run src/app/i18n-mvp-flow-smoke.spec.ts src/app/lobby-i18n.spec.ts src/app/features/player/player-shell.component.spec.ts
+```
+
+## Why this is the gate
+- `i18n-mvp-flow-smoke.spec.ts` giver en lille, samlet smoke/e2e-lignende verifikation af host+player i begge locale-kontekster.
+- `lobby-i18n.spec.ts` holder shared locale propagation + contract fallback grøn.
+- `player-shell.component.spec.ts` dækker den dybere regressionflade for audio-guard på secondary device.
+
+## Conclusion
+Gate’en verificerer nu eksplicit begge locale-runs (`da` + `en`) og bekræfter primary-only audio routing i MVP-flowet.
--- a/docs/ISSUE-279-I18N-MVP-CLOSEOUT.md
+++ b/docs/ISSUE-279-I18N-MVP-CLOSEOUT.md
@@ -0,0 +1,168 @@
+# ISSUE-279 — i18n MVP close-out note
+
+Issue: **#279** (`[READY][#175][P5] MVP close-out note: migration/changelog + release-readiness checklist for i18n`)
+
+## Scope
+
+Dette dokument lukker MVP-sporet for issue #175 med tre konkrete ting:
+
+1. en migrationsnote for release/deploy,
+2. changelog-indhold der kan genbruges i næste release-note,
+3. en release-readiness checkliste for i18n, forankret i et verificeret snapshot af `main` ved reviewtidspunktet.
+
+Repo-state ved review-opdatering:
+- `main` peger nu på merge commit `1bc4c27` (PR #283), og inkluderer også PR #282 via merge commit `6ad5430`.
+- Denne note er opdateret mod repo-tilstanden verificeret 2026-03-13 UTC, ikke en løbende garanti for senere `main`-ændringer.
+- Denne revision afløser de tidligere snapshot-antagelser fra PR-historikken, hvor #282/#283 endnu ikke var landet.
+- Der er ingen åbne release-afklaringer tilbage for PR #282/#283; begge er allerede landet på `main`.
+
+## Current i18n MVP state on `main`
+
+Følgende er allerede til stede på `main`:
+
+- **Shared contract** i `shared/i18n/lobby.json`
+  - default locale: `en`
+  - supported locales: `en`, `da`
+  - fælles frontend/backend keyspace + fallback-regler
+- **Django bootstrap** via `partyhub/i18n_bootstrap.py` og `partyhub/settings.py`
+  - `LocaleMiddleware` aktiv
+  - `LANGUAGE_CODE` + `LANGUAGES` bootstrappes fra shared catalog
+- **Backend locale/error flow** via `lobby/i18n.py`
+  - normalisering af locale-tags
+  - locale-aware fejlpayload med `error_code`, `error`, `locale`
+  - fallback til `en` når locale eller oversættelse mangler
+- **Angular MVP wiring** via
+  - `frontend/shared/i18n/lobby-loader.ts`
+  - `frontend/angular/src/app/lobby-i18n.ts`
+  - host/player shells med locale switch og shared copy-opslag
+- **Drift/parity guardrails**
+  - `shared/i18n/key-manifest.json`
+  - `scripts/check_i18n_drift.py`
+  - frontend parity/contract tests
+- **Existing documentation/artifacts**
+  - `docs/I18N_ARCHITECTURE.md`
+  - `docs/ISSUE-175-I18N-SHARED-CONTRACT-ARTIFACT.md`
+  - `docs/ISSUE-225-BACKEND-I18N-BASELINE-ARTIFACT.md`
+  - `docs/ISSUE-257-SHARED-I18N-KEYSPACE-FRONTEND-LOADER-ARTIFACT.md`
+  - `docs/ISSUE-207-I18N-AUDIO-SMOKE-ARTIFACT.md`
+  - `docs/i18n-drift-check.md`
+
+## Migration note for release
+
+### Schema impact
+
+**Der er ingen nye Django-migrations i selve i18n-MVP-sporet på `main`.**
+
+Den i18n-relaterede leverance ligger i shared catalog, locale-bootstrap, error-payload-kontrakt, Angular wiring og test/documentation. Den kræver derfor ikke en særskilt i18n-database-migration for at gå i release.
+
+### Release/deploy expectation
+
+Selv om issue #279 ikke introducerer schemaændringer, skal release-flow stadig følge repoets generelle migreringsgate:
+
+```bash
+python manage.py makemigrations --check --dry-run
+python manage.py migrate --check --noinput
+```
+
+Hvorfor: release-policyen kræver, at vi undgår code/schema drift, og staging-smoke-suiten forventer eksplicit migration consistency check.
+
+### Praktisk migrationskonklusion
+
+Til release-notes/deploy-runbook kan i18n-sporet beskrives sådan her:
+
+- **Migration impact:** none for i18n MVP itself
+- **Deploy requirement:** run standard Django migration consistency checks anyway
+- **Rollback note:** rollback er primært kode-/asset-baseret (shared catalog, frontend bundles, backend locale resolver), ikke schema-baseret
+
+## Suggested changelog content
+
+Følgende tekst kan bruges direkte i næste unreleased/release-sektion:
+
+```markdown
+### i18n
+- Shared da/en lobby i18n contract is now wired across Django and Angular MVP flows via `shared/i18n/lobby.json`.
+- Backend error payloads expose stable locale-aware fields (`error_code`, `error`, `locale`) with fallback to English for unsupported locales.
+- Angular host/player shells now consume shared i18n copy, persist preferred locale, and keep audio-policy messaging aligned with the shared catalog.
+- Added repo guardrails for i18n drift/parity through the shared key manifest, drift checker, and focused frontend/backend contract tests.
+- Release migration impact for the i18n MVP is **none** beyond the standard Django migration consistency checks.
+```
+
+Kort version til annoterede release-notes:
+
+```markdown
+## i18n MVP close-out
+- Shared da/en contract is active across backend + Angular MVP shell.
+- Locale fallback remains `en` for unsupported requests and missing translations.
+- No i18n-specific schema migration is required; keep standard `migrate --check --noinput` in release verification.
+```
+
+## Release-readiness checklist for i18n
+
+Status er vurderet mod verificeret snapshot `main@1bc4c27` (reviewet 2026-03-13 UTC, inkl. PR #282/#283).
+
+### 1) Shared contract and locale behavior
+
+- [x] Shared catalog findes i `shared/i18n/lobby.json`.
+- [x] Default/supported locales er dokumenteret og implementeret som `en` + `da`.
+- [x] Backend bruger shared contract til locale-aware fejlbeskeder.
+- [x] Frontend/Angular bruger shared loader + shared keyspace.
+- [x] Fallback-regel til `en` er dokumenteret og testet.
+
+### 2) Verification artifacts and local checks
+
+- [x] Arkitektur-note findes: `docs/I18N_ARCHITECTURE.md`.
+- [x] Baseline artifact for issue #175 findes.
+- [x] Backend artifact for issue #225 findes.
+- [x] Frontend/shared loader artifact for issue #257 findes.
+- [x] Drift-check dokumentation findes i `docs/i18n-drift-check.md`.
+- [x] Parity artifact fra issue #277 er på `main` via PR #282 (merge commit `6ad5430`).
+
+### 3) Code readiness on current branch topology
+
+- [x] Angular MVP host/player i18n flow er på `main` (PR #281).
+- [x] Shared locale/bootstrap wiring er på `main`.
+- [x] Django i18n hardening fra issue #275 er på `main` via PR #283 (merge commit `1bc4c27`).
+- [x] PR #283 er ikke længere en separat release-afklaring; hardeningen er allerede indarbejdet på `main`.
+
+### 4) Release gate before shipping i18n as “done”
+
+- [x] PR #282 er allerede merged, så parity-artifact-status er afklaret på `main`.
+- [x] PR #283 er allerede merged, så backend hardening-status er afklaret på `main`.
+- [ ] Kør drift-check fra repo root:
+  ```bash
+  python3 scripts/check_i18n_drift.py
+  ```
+- [ ] Kør backend i18n regressions:
+  ```bash
+  . .venv/bin/activate && python manage.py test \
+    partyhub.tests_i18n_bootstrap \
+    lobby.tests.I18nResolverTests
+  ```
+- [ ] Kør frontend shared-contract/parity checks:
+  ```bash
+  cd frontend && npm test -- --run \
+    tests/lobby-loader.parity.test.ts \
+    tests/lobby-i18n.contract.test.ts
+  ```
+- [ ] Kør Angular MVP locale smoke:
+  ```bash
+  cd frontend/angular && npm test -- --run \
+    src/app/lobby-i18n.spec.ts \
+    src/app/i18n-mvp-flow-smoke.spec.ts \
+    src/app/features/host/host-shell.component.spec.ts \
+    src/app/features/player/player-shell.component.spec.ts
+  ```
+- [ ] Bekræft standard migration consistency gate:
+  ```bash
+  . .venv/bin/activate && python manage.py makemigrations --check --dry-run
+  . .venv/bin/activate && python manage.py migrate --check --noinput
+  ```
+- [ ] Følg `docs/RELEASE_POLICY.md`: staging deploy, `/healthz`, smoke-resultat og changelog-reference før tag.
+
+## Close-out conclusion
+
+**Konklusion:** i18n-MVP'en er implementeret på `main`, og issue #279 leverer den manglende release-/migration-closeout dokumentation uden nye kodeændringer i app-logikken.
+
+PR #282 (parity artifact) og PR #283 (Django i18n hardening) er nu begge merged på `main`, så close-out-noten, changelog-teksten og release-readiness-checklisten kan behandles som indbyrdes konsistente for det verificerede snapshot.
+
+Det betyder, at de resterende release-gates for i18n nu er de almindelige verificeringstrin (drift-check, backend/frontend-smoke, migrations-konsistens, staging deploy og changelog-reference) — ikke længere afklaring af om #282/#283 skal lande.
--- a/docs/ISSUE-287-CANONICAL-ROUND-FLOW-BACKEND-ARTIFACT.md
+++ b/docs/ISSUE-287-CANONICAL-ROUND-FLOW-BACKEND-ARTIFACT.md
@@ -0,0 +1,22 @@
+# Issue #287 — Canonical round-flow backend artifact
+
+## State-transition matrix
+
+| Trigger | From | To | Server-owned effect |
+|---|---|---|---|
+| `POST /lobby/sessions/{code}/rounds/start` | `lobby` | `lie` | Opretter `RoundConfig`, vælger/låser konkret `RoundQuestion`, eksponerer prompt + lie-deadline i samme svar |
+| Sidste gyldige `submit_lie` for aktivt spørgsmål | `lie` | `guess` | Dedupe/shuffle `correct_answer + lies`, persisterer `mixed_answers`, broadcaster `phase.guess_started` |
+| Sidste gyldige `submit_guess` for aktivt spørgsmål | `guess` | `reveal` | Beregner score deterministisk, persisterer `ScoreEvent` + opdaterede `Player.score`, returnerer canonical reveal payload |
+| Første canonical state-read efter resolved reveal (`session_detail`, og idempotent `GET /scoreboard` hvis state allerede er resolved) | `reveal` | `scoreboard` | Promoverer scoreboard som state, broadcaster `phase.scoreboard`, eksponerer leaderboard + readiness |
+| `POST /lobby/sessions/{code}/rounds/next` | `scoreboard` | `lie` | Increment round counter, kopierer seneste `RoundConfig`, vælger/låser næste spørgsmål i samme kategori og broadcaster `phase.lie_started` |
+| `POST /lobby/sessions/{code}/finish` | `scoreboard` | `finished` | Fryser slutresultat og returnerer final leaderboard |
+
+## Flow-log (happy path)
+
+1. Host starter runde med kategori.
+2. Server vælger straks spørgsmål og går i `lie`.
+3. Spillere sender løgne; sidste submission auto-advancer til `guess`.
+4. Spillere sender gæt; sidste submission auto-advancer til `reveal` og scorer runden.
+5. Næste canonical state-read promoverer resolved reveal til `scoreboard`; state findes uden separat debug-knap.
+6. Host kan nu kun vælge `next round` eller `finish game`.
+7. `next round` starter næste runde direkte i `lie` med nyt konkret spørgsmål; ingen mellem-hop tilbage til `lobby`.
--- a/docs/plans/2026-03-09-fupogfakta-game-engine-design.md
+++ b/docs/plans/2026-03-09-fupogfakta-game-engine-design.md
@@ -0,0 +1,272 @@
+# Design: Fup og Fakta — Game Engine & Platform Architecture
+
+**Date:** 2026-03-09
+**Status:** Approved
+
+---
+
+## Overview
+
+Build a working Fup og Fakta game (Fibbage-style) on top of a **pluggable game platform**. The platform handles sessions, players, WebSocket push, and Celery-driven timers. Each game is a self-contained **cartridge** that implements a shared driver interface and owns its own models, config, and phase logic.
+
+---
+
+## Platform Architecture
+
+```
+partyhub/     Django project — settings, Celery app, ASGI
+lobby/        Platform layer — sessions, players, GameRun, timer dispatch
+realtime/     WebSocket consumers (already built)
+fupogfakta/   Game cartridge #1
+future_game/  Game cartridge #N (same interface)
+```
+
+### Platform provides (`lobby/`)
+
+#### Models
+
+**`GameSession`** (exists, minor additions)
+- `game_type` (CharField) — e.g. `"fupogfakta"`
+- `host` (FK → User)
+- `code` (6-char session code)
+- `status` (LOBBY / ACTIVE / FINISHED)
+- `config_id` / `config_snapshot` — see Config section
+
+**`GameRun`** (new — ephemeral, deleted on game exit)
+- `session` (OneToOne → GameSession)
+- `current_state` (CharField — game-defined state string)
+- `phase_deadline` (DateTimeField, nullable)
+- `is_paused` (BooleanField, default False)
+- `paused_remaining_seconds` (FloatField, nullable)
+- `celery_task_id` (CharField, nullable)
+- `state_data` (JSONField) — game-specific snapshot for current phase
+
+**`Player`** (exists)
+- `session`, `nickname`, `score`, `session_token`, `is_connected`
+
+#### GameDriver interface
+
+Each cartridge implements:
+
+```python
+class GameDriver:
+    game_type: str                        # e.g. "fupogfakta"
+
+    def on_game_start(session, run, config) -> PhaseResult
+    def on_timer_expired(session, run, config) -> PhaseResult
+    def on_pause(session, run) -> None
+    def on_resume(session, run) -> None
+    def on_exit(session, run) -> None     # must clean up all game data
+    def get_ws_payload(state, state_data) -> dict
+```
+
+`PhaseResult` = `(next_state: str, duration_seconds: int | None, broadcast_payload: dict)`
+
+#### Celery task
+
+```python
+@app.task
+def handle_timer_expired(run_id: int, expected_state: str):
+    # If run no longer exists or state has changed → stale task, ignore
+    # Call driver.on_timer_expired(session, run, config)
+    # Apply PhaseResult: update run, broadcast via channel layer, schedule next task
+```
+
+`expected_state` prevents stale tasks from firing after pause/resume or manual state changes.
+
+#### REST endpoints (platform-level)
+
+- `POST /sessions/{code}/play` — start or resume
+- `POST /sessions/{code}/pause` — pause current phase timer
+- `POST /sessions/{code}/exit` — end game, delete GameRun + all game data
+
+---
+
+## Configuration System
+
+### Base config model (`partyhub/`)
+
+```python
+class BaseGameConfig(models.Model):
+    class Meta:
+        abstract = True
+
+    name = models.CharField(max_length=100)          # "Quick game", "Full evening"
+    user = models.ForeignKey(User, null=True, ...)    # null = system default
+    is_default = models.BooleanField(default=False)
+    created_at = models.DateTimeField(auto_now_add=True)
+```
+
+### Game-specific config (`fupogfakta/`)
+
+```python
+class FupOgFaktaConfig(BaseGameConfig):
+    num_rounds               = PositiveIntegerField(default=3)
+    questions_per_round      = PositiveIntegerField(default=3)
+    min_players              = PositiveIntegerField(default=2)
+    max_players              = PositiveIntegerField(default=8)
+    lie_seconds              = PositiveIntegerField(default=45)
+    guess_seconds            = PositiveIntegerField(default=30)
+    reveal_seconds_per_lie   = PositiveIntegerField(default=8)
+    scoreboard_recap_seconds = PositiveIntegerField(default=10)
+    # Escalating scoring per round (stored as arrays or separate fields)
+    points_correct           = JSONField(default=[1500, 3000, 4500])
+    points_bluff             = JSONField(default=[500, 1000, 1500])
+    # Reaction bonus (static, feeds post-game awards only)
+    reaction_bonus           = IntegerField(default=5)
+```
+
+### Default resolution at session start
+
+1. User has `is_default=True` row for this game type → use that
+2. System default (`user=null, is_default=True`) — set in Django admin
+3. Model field `default=` values (hardcoded)
+
+User can have **multiple named presets** (one-to-many). When starting a session they choose which to use (or it auto-selects their default). The chosen config's values are **snapshotted into `GameRun.state_data`** at game start — immutable for the life of the session.
+
+---
+
+## Fup og Fakta — Game States
+
+```
+LOBBY
+  │ (host presses Play)
+  ▼
+LIE_PHASE         timer: lie_seconds
+  │ (all submitted OR timer expires)
+  ▼
+GUESS_PHASE       timer: guess_seconds
+  │ (timer expires — no mercy)
+  ▼
+REVEAL_LIE_{n}    timer: reveal_seconds_per_lie  (one per lie with ≥1 guess)
+  │                    → score liar incrementally as each is shown
+  ▼
+REVEAL_TRUTH      timer: reveal_seconds_per_lie
+  │                    → score correct guessers
+  ▼
+SCOREBOARD_RECAP  timer: scoreboard_recap_seconds
+  │
+  ├─ more questions in round → back to LIE_PHASE (next question)
+  ├─ round done, more rounds → back to LIE_PHASE (next round, next category)
+  └─ all rounds done → POST_GAME_AWARDS
+       timer: configurable
+       → FINISHED (GameRun deleted, GameSession status = FINISHED)
+```
+
+---
+
+## Fup og Fakta — Phase Details
+
+### LIE_PHASE
+- Question shown to all clients via WebSocket (`phase.lie_started` event)
+- Players submit lie via `POST /fupogfakta/{code}/lie`
+- **If lie matches correct answer (case-insensitive):** return `error_code: lie_matches_correct_answer` — player prompted again, does not consume their submission
+- Anonymous to other players during this phase
+- `state_data` tracks: question id, round number, how many have submitted (for progress display on host screen)
+- Timer expires → transition to GUESS_PHASE regardless of how many submitted
+
+### GUESS_PHASE
+- Answers mixed (lies + truth, deduped) broadcast to all clients (`phase.guess_started`)
+- Players guess via `POST /fupogfakta/{code}/guess`
+- **After selecting:** player can react to other lies with 👍 😂 ❤️ etc. until timer expires. Cannot change guess.
+- Reactions stored in `LieReaction` model (player, lie, reaction_type)
+- Timer expires → transition to first REVEAL_LIE (or REVEAL_TRUTH if no lies had guesses)
+
+### REVEAL_LIE_{n}
+- One Celery task per lie to reveal (only lies with ≥1 guesser)
+- Broadcast: which lie, who wrote it, who guessed it (`phase.reveal_lie`)
+- Score awarded to liar: `points_bluff[round_index] × guesser_count`
+- Score broadcast immediately (`phase.score_delta`)
+- Skipped lies (0 guesses): not shown at all
+
+### REVEAL_TRUTH
+- Broadcast: correct answer, who guessed correctly (`phase.reveal_truth`)
+- Score awarded: `points_correct[round_index]` per correct guesser
+- Also show reaction totals on each lie during this phase
+
+### SCOREBOARD_RECAP
+- Full leaderboard broadcast (`phase.scoreboard`)
+- Auto-advances to next question, next round, or post-game
+
+### POST_GAME_AWARDS
+- Computed from `LieReaction` aggregate:
+  - "Most Hilarious Liar" — most 😂 reactions total
+  - "Most Beloved Lie" — most ❤️ reactions on a single lie
+  - etc. (extensible)
+- Broadcast as `phase.awards`
+- Then FINISHED → GameRun deleted, all session game data wiped
+
+---
+
+## Fup og Fakta — Models
+
+**Existing (keep):** `Category`, `Question`, `RoundQuestion`, `LieAnswer`, `Guess`
+
+**Remove:** `ScoreEvent` (no audit trail needed — game state is ephemeral)
+
+**New:**
+```python
+class LieReaction(models.Model):
+    lie      = ForeignKey(LieAnswer, on_delete=CASCADE)
+    player   = ForeignKey(Player, on_delete=CASCADE)
+    reaction = CharField(max_length=20)  # "laugh", "heart", "fire", etc.
+    created_at = auto_now_add
+    class Meta:
+        unique_together = [("lie", "player", "reaction")]
+```
+
+**Modify `RoundQuestion`:**
+- Add `reveal_order` (PositiveIntegerField, nullable) — set when GUESS_PHASE ends, determines reveal sequence
+
+---
+
+## Pause / Resume
+
+- **Pause:** compute `remaining = phase_deadline - now`, store in `paused_remaining_seconds`, set `is_paused=True`, revoke Celery task by `celery_task_id`
+- **Resume:** set `phase_deadline = now + paused_remaining_seconds`, schedule new Celery task, clear pause fields
+- Stale task guard: every Celery task checks `expected_state == run.current_state` before firing
+
+---
+
+## Host Controls (Session Owner Only)
+
+| Action | Effect |
+|--------|--------|
+| Play   | Starts game from LOBBY, or resumes from paused |
+| Pause  | Freezes current phase timer, broadcasts `phase.paused` |
+| Exit   | Ends game immediately, deletes GameRun + all game data |
+
+Cannot skip. Cannot manually advance phases.
+
+---
+
+## WebSocket Event Reference
+
+| Event | Triggered by | Payload |
+|-------|-------------|---------|
+| `phase.lie_started` | LIE_PHASE start | question prompt, deadline, round info |
+| `phase.lie_progress` | Each lie submitted | n_submitted / n_players (no names) |
+| `phase.guess_started` | GUESS_PHASE start | mixed answers, deadline |
+| `phase.reveal_lie` | REVEAL_LIE_{n} | lie text, author, guessers, score delta |
+| `phase.reveal_truth` | REVEAL_TRUTH | correct answer, correct guessers, score delta |
+| `phase.scoreboard` | SCOREBOARD_RECAP | full leaderboard |
+| `phase.awards` | POST_GAME_AWARDS | award winners |
+| `phase.paused` | Pause | remaining_seconds |
+| `phase.resumed` | Resume | new deadline |
+| `phase.game_over` | FINISHED | final leaderboard |
+
+---
+
+## Data Lifecycle
+
+All game session data (`GameRun`, `RoundQuestion`, `LieAnswer`, `Guess`, `LieReaction`, `Player`) is **deleted when host exits or game reaches FINISHED**. `GameSession` row is kept (with status=FINISHED) for the session code uniqueness constraint. `Category` and `Question` content is permanent.
+
+---
+
+## Not In Scope (This Implementation)
+
+- TTS / read-aloud (Fase 4, deferred)
+- Reconnect recovery after server restart (game is gone if server dies)
+- Spectator/viewer mode (post-MVP)
+- Rate limiting on endpoints (backlog)
+- Bulk question import (Fase 5)
--- a/docs/plans/2026-03-09-fupogfakta-implementation-plan.md
+++ b/docs/plans/2026-03-09-fupogfakta-implementation-plan.md
--- a/docs/spa-cutover-flag.md
+++ b/docs/spa-cutover-flag.md
@@ -59,6 +59,31 @@ Trin-for-trin:

 Target: rollback + sanity-verifikation inden for 10 minutter.

+## React fallback trigger-kriterier (kun delivery-blocking)
+Formål: React fallback må kun bruges som kortvarig leverings-sikring, når release ellers er blokeret.
+
+### Hvornår fallback er tilladt
+Alle punkter skal være opfyldt:
+1. **Delivery-blocking fejl i Angular SPA**
+   - Host/player kerneflow kan ikke leveres i release-vinduet (fx login/join/start/round/scoreboard stopper).
+2. **Ingen hurtig Angular-fix inden for release-vinduet**
+   - Teamet har vurderet at patch + verificering ikke kan nås sikkert i tide.
+3. **Rollback alene løser ikke leveringsbehovet**
+   - `USE_SPA_UI=false` (legacy) er enten utilstrækkelig for den konkrete leverance eller allerede verificeret som ikke tilstrækkelig.
+4. **Beslutning er eksplicit logget**
+   - Trigger, impact, UTC-tid, ansvarlig, issue/incident-reference og plan for tilbagevenden til Angular er dokumenteret i release/smoke artifact.
+
+### Scope-limits for fallback
+- Fallback omfatter kun **delivery-blocking host/player-paths**.
+- Ingen nye features, UX-forbedringer eller ikke-kritiske ændringer må bundtes ind i fallback.
+- Fallback er **midlertidig** og gælder kun for aktiv incident/release-vindue.
+- Når blocker er fjernet, skal miljøet tilbage på standard cutover-spor (Angular + `USE_SPA_UI` styring).
+
+### Ikke tilladt
+- Proaktiv fallback "for en sikkerheds skyld" uden aktiv blocker.
+- Brug af fallback til at omgå normale kvalitetsgates eller testkrav.
+- Langvarig drift i fallback-mode uden dokumenteret blocker og opfølgningsplan.
+
 ## Verifikation
 - Flag OFF: `UiScreenTests.test_legacy_templates_are_used_when_spa_flag_is_off`
 - Flag ON (host): `UiScreenTests.test_host_screen_can_render_angular_shell_when_feature_flag_enabled`
--- a/frontend/angular/src/app/api-contract-smoke.spec.ts
+++ b/frontend/angular/src/app/api-contract-smoke.spec.ts
@@ -19,6 +19,24 @@ describe('SPA Angular API contract smoke (host/player foundation)', () => {
            shown_at: '2026-03-01T18:00:00Z',
            answers: [{ text: 'A' }, { text: 'B' }]
          },
+          reveal: {
+            round_question_id: 77,
+            round_number: 1,
+            prompt: 'Q?',
+            correct_answer: 'A',
+            lies: [{ player_id: 2, nickname: 'Maja', text: 'B', created_at: '2026-03-01T18:00:05Z' }],
+            guesses: [
+              {
+                player_id: 3,
+                nickname: 'Bo',
+                selected_text: 'B',
+                is_correct: false,
+                fooled_player_id: 2,
+                fooled_player_nickname: 'Maja',
+                created_at: '2026-03-01T18:00:15Z'
+              }
+            ]
+          },
          phase_view_model: {
            status: 'lobby',
            round_number: 1,
@@ -31,17 +49,17 @@ describe('SPA Angular API contract smoke (host/player foundation)', () => {
            },
            host: {
              can_start_round: true,
-              can_show_question: true,
-              can_mix_answers: true,
-              can_calculate_scores: true,
-              can_reveal_scoreboard: true,
-              can_start_next_round: true,
-              can_finish_game: true
+              can_show_question: false,
+              can_mix_answers: false,
+              can_calculate_scores: false,
+              can_reveal_scoreboard: false,
+              can_start_next_round: false,
+              can_finish_game: false
            },
            player: {
              can_join: true,
-              can_submit_lie: true,
-              can_submit_guess: true,
+              can_submit_lie: false,
+              can_submit_guess: false,
              can_view_final_result: false
            }
          }
@@ -50,7 +68,7 @@ describe('SPA Angular API contract smoke (host/player foundation)', () => {

      if (url === '/lobby/sessions/ABCD12/scoreboard') {
        return {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
+          session: { code: 'ABCD12', status: 'scoreboard', current_round: 1 },
          leaderboard: [
            { id: 9, nickname: 'Maja', score: 200 },
            { id: 10, nickname: 'Bo', score: 150 }
@@ -107,6 +125,12 @@ describe('SPA Angular API contract smoke (host/player foundation)', () => {
          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
          round_question: { id: 77, round_number: 1 },
          events_created: 2,
+          reveal: {
+            round_question_id: 77,
+            correct_answer: 'A',
+            lies: [],
+            guesses: []
+          },
          leaderboard: [
            { id: 9, nickname: 'Maja', score: 200 },
            { id: 10, nickname: 'Bo', score: 150 }
@@ -170,8 +194,10 @@ describe('SPA Angular API contract smoke (host/player foundation)', () => {
    expect(session.ok).toBe(true);
    if (session.ok) {
      expect(session.data.session.code).toBe('ABCD12');
-      expect(session.data.phase_view_model.host.can_start_next_round).toBe(true);
-      expect(session.data.phase_view_model.player.can_submit_guess).toBe(true);
+      expect(session.data.phase_view_model.host.can_start_next_round).toBe(false);
+      expect(session.data.phase_view_model.player.can_submit_guess).toBe(false);
+      expect(session.data.reveal?.correct_answer).toBe('A');
+      expect(session.data.reveal?.guesses[0].fooled_player_nickname).toBe('Maja');
    }

    expect((await client.joinSession({ code: ' abcd12 ', nickname: ' Maja ' })).ok).toBe(true);
--- a/frontend/angular/src/app/features/host/host-shell.component.spec.ts
+++ b/frontend/angular/src/app/features/host/host-shell.component.spec.ts
@@ -12,7 +12,26 @@ function jsonResponse(status: number, body: unknown) {
  } as unknown as Response;
 }

-function sessionDetailPayload(status: string, options?: { roundQuestionId?: number | null }) {
+function sessionDetailPayload(
+  status: string,
+  options?: {
+    roundQuestionId?: number | null;
+    reveal?: {
+      correct_answer: string;
+      prompt?: string;
+      lies?: Array<{ player_id: number; nickname: string; text: string; created_at?: string }>;
+      guesses?: Array<{
+        player_id: number;
+        nickname: string;
+        selected_text: string;
+        is_correct: boolean;
+        fooled_player_id: number | null;
+        fooled_player_nickname?: string;
+        created_at?: string;
+      }>;
+    } | null;
+  }
+) {
  const roundQuestionId = options?.roundQuestionId ?? 41;

  return {
@@ -37,6 +56,23 @@ function sessionDetailPayload(status: string, options?: { roundQuestionId?: numb
      { id: 1, nickname: 'Host', score: 0, is_connected: true },
      { id: 2, nickname: 'Mads', score: 120, is_connected: true },
    ],
+    reveal:
+      options?.reveal === undefined || options?.reveal === null
+        ? null
+        : {
+            round_question_id: roundQuestionId,
+            round_number: 1,
+            prompt: options.reveal.prompt ?? 'Q?',
+            correct_answer: options.reveal.correct_answer,
+            lies: (options.reveal.lies ?? []).map((lie) => ({
+              ...lie,
+              created_at: lie.created_at ?? '2026-01-01T00:00:05Z',
+            })),
+            guesses: (options.reveal.guesses ?? []).map((guess) => ({
+              ...guess,
+              created_at: guess.created_at ?? '2026-01-01T00:00:10Z',
+            })),
+          },
    phase_view_model: {
      status,
      round_number: 1,
@@ -101,54 +137,53 @@ describe('HostShellComponent gameplay wiring', () => {
    expect(component.loading).toBe(false);
  });

-  it('captures scoreboard error for retry path', async () => {
-    const fetchMock: FetchMock = vi.fn().mockResolvedValue(jsonResponse(500, { error: 'Scoreboard unavailable' }));
+  it('hydrates canonical reveal payload in reveal phase', async () => {
+    const fetchMock: FetchMock = vi.fn().mockResolvedValue(
+      jsonResponse(
+        200,
+        sessionDetailPayload('reveal', {
+          roundQuestionId: 77,
+          reveal: {
+            correct_answer: 'Mercury',
+            lies: [{ player_id: 2, nickname: 'Mads', text: 'Venus' }],
+            guesses: [
+              {
+                player_id: 3,
+                nickname: 'Luna',
+                selected_text: 'Venus',
+                is_correct: false,
+                fooled_player_id: 2,
+                fooled_player_nickname: 'Mads',
+              },
+            ],
+          },
+        })
+      )
+    );

    vi.stubGlobal('fetch', fetchMock);

    const component = new HostShellComponent();
    component.sessionCode = 'ABCD12';

-    await component.loadScoreboard();
+    await component.refreshSession();

-    expect(fetchMock).toHaveBeenCalledWith('/lobby/sessions/ABCD12/scoreboard', expect.objectContaining({ method: 'GET' }));
-    expect(component.scoreboardError).toContain('Scoreboard failed: Scoreboard unavailable');
-    expect(component.loading).toBe(false);
+    expect(component.session?.reveal?.correct_answer).toBe('Mercury');
+    expect(component.session?.reveal?.lies[0]).toMatchObject({ player_id: 2, nickname: 'Mads', text: 'Venus' });
+    expect(component.session?.reveal?.guesses[0]).toMatchObject({
+      player_id: 3,
+      nickname: 'Luna',
+      selected_text: 'Venus',
+      fooled_player_id: 2,
+      fooled_player_nickname: 'Mads',
+    });
  });

  it('wires showQuestion, mixAnswers and calculateScores with canonical phase gating', async () => {
    const fetchMock: FetchMock = vi
      .fn()
-      .mockResolvedValueOnce(
-        jsonResponse(200, {
-          round_question: {
-            id: 77,
-            round_number: 1,
-            prompt: 'Q?',
-            shown_at: '2026-01-01T00:00:00Z',
-            lie_deadline_at: '2026-01-01T00:00:45Z',
-          },
-          config: { lie_seconds: 45 },
-        })
-      )
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('lie', { roundQuestionId: 77 })))
-      .mockResolvedValueOnce(
-        jsonResponse(200, {
-          session: { code: 'ABCD12', status: 'guess', current_round: 1 },
-          round_question: { id: 77, round_number: 1 },
-          answers: [{ text: 'A' }],
-        })
-      )
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('guess', { roundQuestionId: 77 })))
-      .mockResolvedValueOnce(
-        jsonResponse(200, {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
-          round_question: { id: 77, round_number: 1 },
-          events_created: 2,
-          leaderboard: [{ id: 1, nickname: 'Luna', score: 320 }],
-        })
-      )
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('reveal', { roundQuestionId: 77 })));
+      .mockResolvedValueOnce(jsonResponse(200, { session: { code: 'ABCD12', status: 'lie', current_round: 2 } }))
+      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('lie', { roundQuestionId: 99 })));

    vi.stubGlobal('fetch', fetchMock);

@@ -190,8 +225,8 @@ describe('HostShellComponent gameplay wiring', () => {
      expect.objectContaining({ method: 'POST', body: JSON.stringify({}) })
    );
    expect(fetchMock).toHaveBeenNthCalledWith(2, '/lobby/sessions/ABCD12', expect.objectContaining({ method: 'GET' }));
-    expect(component.session?.session.status).toBe('lobby');
-    expect(component.scoreboardPayload).toBe('');
+    expect(component.session?.session.status).toBe('lie');
+    expect(component.roundQuestionId).toBe('99');
    expect(component.finalLeaderboardPayload).toBe('');
    expect(component.finalLeaderboard).toEqual([]);
    expect(component.nextRoundError).toBe('');
@@ -307,5 +342,25 @@ describe('HostShellComponent gameplay wiring', () => {
    await component.refreshSession();

    expect(replaceState).toHaveBeenCalledWith(null, '', '#/host/guess/ABCD12');
+    expect(component.canStartRound).toBe(false);
+    expect(component.canStartNextRound).toBe(false);
+    expect(component.canFinishGame).toBe(false);
+  });
+
+  it('uses phase_view_model to keep host action surface bound to round boundaries only', async () => {
+    const component = new HostShellComponent();
+
+    expect(component.canStartRound).toBe(true);
+    expect(component.canStartNextRound).toBe(false);
+    expect(component.canFinishGame).toBe(false);
+
+    component.session = sessionDetailPayload('lie') as any;
+    expect(component.canStartRound).toBe(false);
+    expect(component.canStartNextRound).toBe(false);
+    expect(component.canFinishGame).toBe(false);
+
+    component.session = sessionDetailPayload('scoreboard') as any;
+    expect(component.canStartNextRound).toBe(true);
+    expect(component.canFinishGame).toBe(true);
  });
 });
--- a/frontend/angular/src/app/features/host/host-shell.component.ts
+++ b/frontend/angular/src/app/features/host/host-shell.component.ts
@@ -3,18 +3,14 @@ import { Component, OnDestroy, OnInit } from '@angular/core';
 import { FormsModule } from '@angular/forms';

 import { createApiClient } from '../../../../../src/api/client';
-import type { FinishGameResponse, ScoreboardResponse } from '../../../../../src/api/types';
+import type { FinishGameResponse, ScoreboardResponse, SessionDetailResponse } from '../../../../../src/api/types';
 import { deriveGameplayPhase, isHostGameplayActionAllowed } from '../../../../../src/spa/gameplay-phase-machine';
 import { createVerticalSliceController } from '../../../../../src/spa/vertical-slice';
 import { clientHasNoAudioOutput, resolvePreferredLocale, subscribeToLocaleChanges, t } from '../../lobby-i18n';

-interface SessionDetail {
-  session: { code: string; status: string; current_round: number };
-  round_question: { id: number; prompt: string; answers: Array<{ text: string }> } | null;
-  players: Array<{ id: number; nickname: string; score: number }>;
-}
+type SessionDetail = SessionDetailResponse;

-type LeaderboardEntry = ScoreboardResponse['leaderboard'][number];
+type LeaderboardEntry = FinishGameResponse['leaderboard'][number];
 type LeaderboardResponse = FinishGameResponse;

@Component({
@@ -26,7 +22,7 @@ type LeaderboardResponse = FinishGameResponse;

    <div class="panel" [attr.data-client-has-no-audio-output]="clientHasNoAudioOutput">
      <label>{{ copy('common.session_code') }} <input [(ngModel)]="sessionCode" /></label>
-      <label>{{ copy('host.category') }} <input [(ngModel)]="categorySlug" /></label>
+      <label *ngIf="canStartRound">{{ copy('host.category') }} <input [(ngModel)]="categorySlug" /></label>
      <button (click)="refreshSession()" [disabled]="loading">{{ copy('common.refresh') }}</button>
      <button (click)="startRound()" [disabled]="loading || !canStartRound">{{ copy('host.start_round') }}</button>
      <button (click)="showQuestion()" [disabled]="loading || !canShowQuestion">{{ copy('host.show_question') }}</button>
@@ -42,7 +38,6 @@ type LeaderboardResponse = FinishGameResponse;

    <p *ngIf="session" class="hint">{{ copy('host.audio_locale_hint') }}: {{ locale }}</p>
    <p *ngIf="error" class="error">{{ error }}</p>
-    <p *ngIf="scoreboardError" class="error">{{ scoreboardError }}</p>
    <p *ngIf="nextRoundError" class="error">{{ nextRoundError }}</p>
    <p *ngIf="finishError" class="error">{{ finishError }}</p>

@@ -53,7 +48,28 @@ type LeaderboardResponse = FinishGameResponse;
      <ul>
        <li *ngFor="let p of session.players">{{ p.nickname }}: {{ p.score }}</li>
      </ul>
-      <pre *ngIf="scoreboardPayload">{{ scoreboardPayload }}</pre>
+      <div class="panel" *ngIf="session.reveal && (session.session.status === 'reveal' || session.session.status === 'scoreboard')">
+        <h3>Reveal</h3>
+        <p><strong>Korrekt svar:</strong> {{ session.reveal.correct_answer }}</p>
+        <p><strong>Spørgsmål:</strong> {{ session.reveal.prompt }}</p>
+        <div *ngIf="session.reveal.lies.length">
+          <strong>Løgne</strong>
+          <ul>
+            <li *ngFor="let lie of session.reveal.lies">{{ lie.nickname }} løj: {{ lie.text }}</li>
+          </ul>
+        </div>
+        <div *ngIf="session.reveal.guesses.length">
+          <strong>Gæt</strong>
+          <ul>
+            <li *ngFor="let guess of session.reveal.guesses">
+              {{ guess.nickname }} valgte {{ guess.selected_text }}
+              <span *ngIf="guess.is_correct">· korrekt</span>
+              <span *ngIf="!guess.is_correct && guess.fooled_player_nickname">· narret af {{ guess.fooled_player_nickname }}</span>
+              <span *ngIf="!guess.is_correct && !guess.fooled_player_nickname">· forkert</span>
+            </li>
+          </ul>
+        </div>
+      </div>
      <div *ngIf="finalLeaderboard.length">
        <h3>{{ copy('host.final_leaderboard') }}</h3>
        <p *ngIf="finalWinner"><strong>{{ copy('host.winner') }}:</strong> {{ finalWinner.nickname }} ({{ finalWinner.score }} {{ copy('common.points_short') }})</p>
@@ -220,7 +236,6 @@ export class HostShellComponent implements OnInit, OnDestroy {
      this.sessionCode = this.session.session.code;
      this.persistSessionCode(this.sessionCode);
      this.roundQuestionId = this.session.round_question?.id ? String(this.session.round_question.id) : '';
-      this.scoreboardPayload = '';
      this.resetFinalLeaderboard();
      this.syncRouteFromSession();
    });
@@ -274,7 +289,7 @@ export class HostShellComponent implements OnInit, OnDestroy {
    this.error = '';
    try {
      const code = this.normalizeCode(this.sessionCode);
-      const payload = await this.request<unknown>(`/lobby/sessions/${encodeURIComponent(code)}/scoreboard`, 'GET');
+      const payload = await this.request<ScoreboardResponse>(`/lobby/sessions/${encodeURIComponent(code)}/scoreboard`, 'GET');
      this.scoreboardPayload = JSON.stringify(payload, null, 2);
      await this.refreshSession();
    } catch (error) {
@@ -298,7 +313,6 @@ export class HostShellComponent implements OnInit, OnDestroy {
        throw new Error(this.copy('host.session_code_required'));
      }
      await this.request(`/lobby/sessions/${encodeURIComponent(code)}/rounds/next`, 'POST', {});
-      this.scoreboardPayload = '';
      this.resetFinalLeaderboard();
      await this.refreshSession();
    } catch (error) {
@@ -339,6 +353,7 @@ export class HostShellComponent implements OnInit, OnDestroy {
  }

  private resetFinalLeaderboard(): void {
+    this.scoreboardPayload = '';
    this.finalLeaderboardPayload = '';
    this.finalLeaderboard = [];
    this.finalWinner = null;
--- a/frontend/angular/src/app/features/player/player-shell.component.spec.ts
+++ b/frontend/angular/src/app/features/player/player-shell.component.spec.ts
@@ -13,7 +13,28 @@ function jsonResponse(status: number, body: unknown) {
  } as unknown as Response;
 }

-function sessionDetailPayload(status: string, options?: { answers?: string[]; players?: Array<{ id: number; nickname: string; score: number }>; roundQuestionId?: number | null }) {
+function sessionDetailPayload(
+  status: string,
+  options?: {
+    answers?: string[];
+    players?: Array<{ id: number; nickname: string; score: number }>;
+    roundQuestionId?: number | null;
+    reveal?: {
+      correct_answer: string;
+      prompt?: string;
+      lies?: Array<{ player_id: number; nickname: string; text: string; created_at?: string }>;
+      guesses?: Array<{
+        player_id: number;
+        nickname: string;
+        selected_text: string;
+        is_correct: boolean;
+        fooled_player_id: number | null;
+        fooled_player_nickname?: string;
+        created_at?: string;
+      }>;
+    } | null;
+  }
+) {
  const answers = options?.answers ?? [];
  const roundQuestionId = options?.roundQuestionId ?? 11;

@@ -39,6 +60,23 @@ function sessionDetailPayload(status: string, options?: { answers?: string[]; pl
      ...player,
      is_connected: true,
    })),
+    reveal:
+      options?.reveal === undefined || options?.reveal === null
+        ? null
+        : {
+            round_question_id: roundQuestionId,
+            round_number: 1,
+            prompt: options.reveal.prompt ?? 'Q?',
+            correct_answer: options.reveal.correct_answer,
+            lies: (options.reveal.lies ?? []).map((lie) => ({
+              ...lie,
+              created_at: lie.created_at ?? '2026-01-01T00:00:05Z',
+            })),
+            guesses: (options.reveal.guesses ?? []).map((guess) => ({
+              ...guess,
+              created_at: guess.created_at ?? '2026-01-01T00:00:10Z',
+            })),
+          },
    phase_view_model: {
      status,
      round_number: 1,
@@ -157,6 +195,63 @@ describe('PlayerShellComponent gameplay wiring', () => {
    expect(component.finalLeaderboard.map((entry) => entry.nickname)).toEqual(['Luna', 'Mads']);
  });

+  it('hydrates canonical reveal payload after guess -> reveal', async () => {
+    const fetchMock: FetchMock = vi.fn().mockResolvedValue(
+      jsonResponse(
+        200,
+        sessionDetailPayload('reveal', {
+          answers: ['A', 'B'],
+          reveal: {
+            correct_answer: 'A',
+            lies: [{ player_id: 3, nickname: 'Løgnhals', text: 'B' }],
+            guesses: [
+              {
+                player_id: 9,
+                nickname: 'Detektiv',
+                selected_text: 'B',
+                is_correct: false,
+                fooled_player_id: 3,
+                fooled_player_nickname: 'Løgnhals',
+              },
+              {
+                player_id: 10,
+                nickname: 'Sandhed',
+                selected_text: 'A',
+                is_correct: true,
+                fooled_player_id: null,
+              },
+            ],
+          },
+        })
+      )
+    );
+
+    vi.stubGlobal('fetch', fetchMock);
+
+    const component = new PlayerShellComponent();
+    component.sessionCode = 'ABCD12';
+
+    await component.refreshSession();
+
+    expect(component.session?.reveal?.correct_answer).toBe('A');
+    expect(component.session?.reveal?.lies[0]).toMatchObject({ player_id: 3, nickname: 'Løgnhals', text: 'B' });
+    expect(component.session?.reveal?.guesses[0]).toMatchObject({
+      player_id: 9,
+      nickname: 'Detektiv',
+      selected_text: 'B',
+      is_correct: false,
+      fooled_player_id: 3,
+      fooled_player_nickname: 'Løgnhals',
+    });
+    expect(component.session?.reveal?.guesses[1]).toMatchObject({
+      player_id: 10,
+      nickname: 'Sandhed',
+      selected_text: 'A',
+      is_correct: true,
+      fooled_player_id: null,
+    });
+  });
+
  it('surfaces guess submit error and retries with selected answer payload', async () => {
    const fetchMock: FetchMock = vi
      .fn()
@@ -539,4 +634,28 @@ describe('PlayerShellComponent gameplay wiring', () => {
    expect(component.clientHasNoAudioOutput).toBe(false);
  });

+  it('keeps phone client controls phase-specific and low-complexity', () => {
+    const component = new PlayerShellComponent();
+
+    expect(component.showJoinControls).toBe(true);
+    expect(component.showLieControls).toBe(false);
+    expect(component.showGuessControls).toBe(false);
+    expect(component.showFinalLeaderboard).toBe(false);
+
+    component.session = sessionDetailPayload('lie') as any;
+    component.playerId = 9;
+    component.sessionToken = 'tok';
+    expect(component.showJoinControls).toBe(false);
+    expect(component.showLieControls).toBe(true);
+    expect(component.showGuessControls).toBe(false);
+
+    component.session = sessionDetailPayload('guess', { answers: ['A', 'B'] }) as any;
+    expect(component.showLieControls).toBe(false);
+    expect(component.showGuessControls).toBe(true);
+
+    component.session = sessionDetailPayload('finished', { players: [{ id: 1, nickname: 'Luna', score: 8 }] }) as any;
+    expect(component.showGuessControls).toBe(false);
+    expect(component.showFinalLeaderboard).toBe(true);
+  });
+
 });
--- a/frontend/angular/src/app/features/player/player-shell.component.ts
+++ b/frontend/angular/src/app/features/player/player-shell.component.ts
@@ -3,6 +3,7 @@ import { Component, OnDestroy, OnInit } from '@angular/core';
 import { FormsModule } from '@angular/forms';

 import { createApiClient } from '../../../../../src/api/client';
+import type { SessionDetailResponse } from '../../../../../src/api/types';
 import {
  deriveGameplayPhase,
  isPlayerGameplayActionAllowed,
@@ -11,11 +12,7 @@ import { createSessionContextStore } from '../../../../../src/spa/session-contex
 import { createVerticalSliceController } from '../../../../../src/spa/vertical-slice';
 import { clientHasNoAudioOutput, resolvePreferredLocale, subscribeToLocaleChanges, t } from '../../lobby-i18n';

-interface SessionDetail {
-  session: { code: string; status: string; current_round: number };
-  round_question: { id: number; prompt: string; answers: Array<{ text: string }> } | null;
-  players: Array<{ id: number; nickname: string; score: number }>;
-}
+type SessionDetail = SessionDetailResponse;

 type ConnectionState = 'online' | 'reconnecting' | 'offline';
 type LoadingTransition = 'refresh' | 'join' | 'submit-lie' | 'submit-guess' | null;
@@ -53,9 +50,9 @@ function resolveLocalStorage(): Storage | undefined {

    <div class="panel" [attr.data-client-has-no-audio-output]="clientHasNoAudioOutput">
      <label>{{ copy('common.session_code') }} <input [(ngModel)]="sessionCode" /></label>
-      <label>{{ copy('player.nickname') }} <input [(ngModel)]="nickname" /></label>
+      <label *ngIf="showJoinControls">{{ copy('player.nickname') }} <input [(ngModel)]="nickname" /></label>
      <button (click)="refreshSession()" [disabled]="loading">{{ copy('common.refresh') }}</button>
-      <button (click)="joinSession()" [disabled]="loading">{{ copy('player.join') }}</button>
+      <button *ngIf="showJoinControls" (click)="joinSession()" [disabled]="loading">{{ copy('player.join') }}</button>
    </div>

    <p *ngIf="connectionState === 'reconnecting'" class="error">
@@ -75,26 +72,53 @@ function resolveLocalStorage(): Storage | undefined {
      <p><strong>{{ copy('common.status') }}:</strong> {{ session.session.status }}</p>
      <p *ngIf="session.round_question"><strong>{{ copy('common.prompt') }}:</strong> {{ session.round_question.prompt }}</p>

-      <label>{{ copy('player.lie_label') }} <input [(ngModel)]="lieText" [disabled]="loading || !canSubmitLie" /></label>
-      <button (click)="submitLie()" [disabled]="loading || !canSubmitLie">{{ copy('player.submit_lie') }}</button>
-      <button *ngIf="submitError?.kind === 'lie'" (click)="submitLie()" [disabled]="loading || !canSubmitLie">{{ copy('player.retry_lie_submit') }}</button>
+      <ng-container *ngIf="showLieControls">
+        <label>{{ copy('player.lie_label') }} <input [(ngModel)]="lieText" [disabled]="loading || !canSubmitLie" /></label>
+        <button (click)="submitLie()" [disabled]="loading || !canSubmitLie">{{ copy('player.submit_lie') }}</button>
+        <button *ngIf="submitError?.kind === 'lie'" (click)="submitLie()" [disabled]="loading || !canSubmitLie">{{ copy('player.retry_lie_submit') }}</button>
+      </ng-container>

-      <div class="answers" *ngIf="session.round_question?.answers?.length">
-        <button
-          type="button"
-          *ngFor="let answer of session.round_question?.answers"
-          (click)="selectedGuess = answer.text"
-          [class.active]="selectedGuess === answer.text"
-          [disabled]="loading || !canSubmitGuess"
-        >
-          {{ answer.text }}
-        </button>
+      <ng-container *ngIf="showGuessControls">
+        <div class="answers" *ngIf="session.round_question?.answers?.length">
+          <button
+            type="button"
+            *ngFor="let answer of session.round_question?.answers"
+            (click)="selectedGuess = answer.text"
+            [class.active]="selectedGuess === answer.text"
+            [disabled]="loading || !canSubmitGuess"
+          >
+            {{ answer.text }}
+          </button>
+        </div>
+
+        <button (click)="submitGuess()" [disabled]="loading || !canSubmitGuess || !selectedGuess">{{ copy('player.submit_guess') }}</button>
+        <button *ngIf="submitError?.kind === 'guess'" (click)="submitGuess()" [disabled]="loading || !canSubmitGuess">{{ copy('player.retry_guess_submit') }}</button>
+      </ng-container>
+
+      <div class="panel" *ngIf="session.reveal && (session.session.status === 'reveal' || session.session.status === 'scoreboard')">
+        <h3>Reveal</h3>
+        <p><strong>Korrekt svar:</strong> {{ session.reveal.correct_answer }}</p>
+        <p><strong>Spørgsmål:</strong> {{ session.reveal.prompt }}</p>
+        <div *ngIf="session.reveal.lies.length">
+          <strong>Løgne</strong>
+          <ul>
+            <li *ngFor="let lie of session.reveal.lies">{{ lie.nickname }} løj: {{ lie.text }}</li>
+          </ul>
+        </div>
+        <div *ngIf="session.reveal.guesses.length">
+          <strong>Gæt</strong>
+          <ul>
+            <li *ngFor="let guess of session.reveal.guesses">
+              {{ guess.nickname }} valgte {{ guess.selected_text }}
+              <span *ngIf="guess.is_correct">· korrekt</span>
+              <span *ngIf="!guess.is_correct && guess.fooled_player_nickname">· narret af {{ guess.fooled_player_nickname }}</span>
+              <span *ngIf="!guess.is_correct && !guess.fooled_player_nickname">· forkert</span>
+            </li>
+          </ul>
+        </div>
      </div>

-      <button (click)="submitGuess()" [disabled]="loading || !canSubmitGuess || !selectedGuess">{{ copy('player.submit_guess') }}</button>
-      <button *ngIf="submitError?.kind === 'guess'" (click)="submitGuess()" [disabled]="loading || !canSubmitGuess">{{ copy('player.retry_guess_submit') }}</button>
-
-      <div *ngIf="session.session.status === 'finished' && finalLeaderboard.length">
+      <div *ngIf="showFinalLeaderboard && finalLeaderboard.length">
        <h3>{{ copy('player.final_leaderboard') }}</h3>
        <ol>
          <li *ngFor="let entry of finalLeaderboard">{{ entry.nickname }}: {{ entry.score }}</li>
@@ -277,7 +301,7 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
    }

    const activeElements = document.querySelectorAll('audio,video') as
-      | NodeListOf<GuardableMediaElement>
+      | NodeListOf<HTMLMediaElement>
      | GuardableMediaElement[]
      | undefined;

@@ -316,6 +340,25 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
    }, 3000);
  }

+  get showJoinControls(): boolean {
+    if (!this.session) {
+      return true;
+    }
+    return Boolean(this.session?.phase_view_model?.player?.can_join && !this.playerId && !this.sessionToken);
+  }
+
+  get showLieControls(): boolean {
+    return Boolean(this.session?.phase_view_model?.player?.can_submit_lie);
+  }
+
+  get showGuessControls(): boolean {
+    return Boolean(this.session?.phase_view_model?.player?.can_submit_guess);
+  }
+
+  get showFinalLeaderboard(): boolean {
+    return Boolean(this.session?.phase_view_model?.player?.can_view_final_result);
+  }
+
  get loadingMessage(): string {
    switch (this.loadingTransition) {
      case 'join':
--- a/frontend/angular/src/app/i18n-mvp-flow-smoke.spec.ts
+++ b/frontend/angular/src/app/i18n-mvp-flow-smoke.spec.ts
@@ -4,42 +4,56 @@ import { HostShellComponent } from './features/host/host-shell.component';
 import { PlayerShellComponent } from './features/player/player-shell.component';
 import { setPreferredLocale } from './lobby-i18n';

+function stubShellGlobals(initialLocale: string) {
+  vi.stubGlobal('window', {
+    location: { hash: '', search: '' },
+    history: { state: null, replaceState: vi.fn() },
+    localStorage: { getItem: vi.fn().mockReturnValue(initialLocale), setItem: vi.fn(), removeItem: vi.fn() },
+    sessionStorage: { getItem: vi.fn().mockReturnValue(null), setItem: vi.fn(), removeItem: vi.fn() },
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+  });
+  vi.stubGlobal('navigator', { language: `${initialLocale}-US`, onLine: true });
+}
+
 describe('i18n MVP flow smoke (host/player + audio policy)', () => {
  afterEach(() => {
    vi.restoreAllMocks();
    vi.unstubAllGlobals();
  });

-  it('resolves host/player copy in en and da from shared catalog', () => {
-    vi.stubGlobal('window', {
-      location: { hash: '', search: '' },
-      history: { state: null, replaceState: vi.fn() },
-      localStorage: { getItem: vi.fn().mockReturnValue('en'), setItem: vi.fn(), removeItem: vi.fn() },
-      sessionStorage: { getItem: vi.fn().mockReturnValue(null), setItem: vi.fn(), removeItem: vi.fn() },
-      addEventListener: vi.fn(),
-      removeEventListener: vi.fn(),
-    });
-    vi.stubGlobal('navigator', { language: 'en-US', onLine: true });
+  it.each([
+    {
+      locale: 'en',
+      hostRefresh: 'Refresh',
+      hostStartRound: 'Start round',
+      playerSubmitGuess: 'Submit guess',
+    },
+    {
+      locale: 'da',
+      hostRefresh: 'Opdatér',
+      hostStartRound: 'Start runde',
+      playerSubmitGuess: 'Send gæt',
+    },
+  ])('resolves one host/player locale run for $locale', ({ locale, hostRefresh, hostStartRound, playerSubmitGuess }) => {
+    stubShellGlobals(locale);

    const host = new HostShellComponent();
    const player = new PlayerShellComponent();
    host.ngOnInit();
    player.ngOnInit();
+    setPreferredLocale(locale);

-    expect(host.copy('game.host.start_round')).toBe('Start round');
-    expect(player.copy('game.player.submit_guess')).toBe('Submit guess');
-
-    setPreferredLocale('da');
-
-    expect(host.copy('game.host.start_round')).toBe('Start runde');
-    expect(player.copy('game.player.submit_guess')).toBe('Send gæt');
+    expect(host.copy('common.refresh')).toBe(hostRefresh);
+    expect(host.copy('game.host.start_round')).toBe(hostStartRound);
+    expect(player.copy('game.player.submit_guess')).toBe(playerSubmitGuess);

    player.ngOnDestroy();
    host.ngOnDestroy();
  });

-  it('keeps audio routing policy primary-only (client has no audio output)', async () => {
-    const originalPlay = vi.fn().mockRejectedValue(new Error('original play'));
+  it('keeps audio routing primary-only by guarding player playback without muting the host path', async () => {
+    const originalPlay = vi.fn().mockRejectedValue(new Error('primary host playback'));
    const mediaPrototype = { play: originalPlay };

    vi.stubGlobal('window', {
@@ -57,7 +71,7 @@ describe('i18n MVP flow smoke (host/player + audio policy)', () => {
    const host = new HostShellComponent();
    host.ngOnInit();

-    await expect(mediaPrototype.play()).rejects.toThrow('original play');
+    await expect(mediaPrototype.play()).rejects.toThrow('primary host playback');

    const player = new PlayerShellComponent();
    player.ngOnInit();
@@ -66,7 +80,7 @@ describe('i18n MVP flow smoke (host/player + audio policy)', () => {

    player.ngOnDestroy();

-    await expect(mediaPrototype.play()).rejects.toThrow('original play');
+    await expect(mediaPrototype.play()).rejects.toThrow('primary host playback');

    host.ngOnDestroy();
  });
--- a/frontend/src/api/client.ts
+++ b/frontend/src/api/client.ts
@@ -5,9 +5,9 @@ import {
  mapJoinSessionResponse,
  mapMixAnswersResponse,
  mapScoreboardResponse,
-  mapStartNextRoundResponse,
  mapSessionDetailResponse,
  mapShowQuestionResponse,
+  mapStartNextRoundResponse,
  mapStartRoundResponse,
  mapSubmitGuessResponse,
  mapSubmitLieResponse
@@ -21,9 +21,9 @@ import type {
  JoinSessionResponse,
  MixAnswersResponse,
  ScoreboardResponse,
-  StartNextRoundResponse,
  SessionDetailResponse,
  ShowQuestionResponse,
+  StartNextRoundResponse,
  StartRoundRequest,
  StartRoundResponse,
  SubmitGuessRequest,
--- a/frontend/src/api/mappers.ts
+++ b/frontend/src/api/mappers.ts
@@ -60,6 +60,17 @@ function readBoolean(record: Record<string, unknown>, key: string, path: string)
  return value;
 }

+function readNullableNumber(record: Record<string, unknown>, key: string, path: string): number | null {
+  const value = record[key];
+  if (value === undefined || value === null) {
+    return null;
+  }
+  if (!isNumber(value)) {
+    throw new Error(`Invalid API contract: expected number|null at ${path}.${key}`);
+  }
+  return value;
+}
+
 export function mapHealthResponse(payload: unknown): HealthResponse {
  const root = asRecord(payload, 'health');
  return {
@@ -102,6 +113,58 @@ function mapSessionDetail(payload: unknown): SessionDetailResponse {
  const host = asRecord(phase.host, 'session_detail.phase_view_model.host');
  const player = asRecord(phase.player, 'session_detail.phase_view_model.player');

+  const revealRaw = root.reveal;
+  let reveal: SessionDetailResponse['reveal'] = null;
+  if (revealRaw !== null && revealRaw !== undefined) {
+    const revealRecord = asRecord(revealRaw, 'session_detail.reveal');
+    const liesRaw = revealRecord.lies;
+    const guessesRaw = revealRecord.guesses;
+    if (!Array.isArray(liesRaw)) {
+      throw new Error('Invalid API contract: expected array at session_detail.reveal.lies');
+    }
+    if (!Array.isArray(guessesRaw)) {
+      throw new Error('Invalid API contract: expected array at session_detail.reveal.guesses');
+    }
+
+    reveal = {
+      round_question_id: readNumber(revealRecord, 'round_question_id', 'session_detail.reveal'),
+      round_number: readNumber(revealRecord, 'round_number', 'session_detail.reveal'),
+      prompt: readString(revealRecord, 'prompt', 'session_detail.reveal'),
+      correct_answer: readString(revealRecord, 'correct_answer', 'session_detail.reveal'),
+      lies: liesRaw.map((lie, index) => {
+        const record = asRecord(lie, `session_detail.reveal.lies[${index}]`);
+        return {
+          player_id: readNumber(record, 'player_id', `session_detail.reveal.lies[${index}]`),
+          nickname: readString(record, 'nickname', `session_detail.reveal.lies[${index}]`),
+          text: readString(record, 'text', `session_detail.reveal.lies[${index}]`),
+          created_at: readString(record, 'created_at', `session_detail.reveal.lies[${index}]`)
+        };
+      }),
+      guesses: guessesRaw.map((guess, index) => {
+        const path = `session_detail.reveal.guesses[${index}]`;
+        const record = asRecord(guess, path);
+        const fooledPlayerId = readNullableNumber(record, 'fooled_player_id', path);
+        const fooledPlayerNickname = record.fooled_player_nickname;
+        if (fooledPlayerId === null) {
+          if (fooledPlayerNickname !== undefined) {
+            throw new Error(`Invalid API contract: expected ${path}.fooled_player_nickname to be omitted when fooled_player_id is null`);
+          }
+        } else if (!isString(fooledPlayerNickname)) {
+          throw new Error(`Invalid API contract: expected string at ${path}.fooled_player_nickname when fooled_player_id is set`);
+        }
+        return {
+          player_id: readNumber(record, 'player_id', path),
+          nickname: readString(record, 'nickname', path),
+          selected_text: readString(record, 'selected_text', path),
+          is_correct: readBoolean(record, 'is_correct', path),
+          fooled_player_id: fooledPlayerId,
+          ...(fooledPlayerNickname === undefined ? {} : { fooled_player_nickname: fooledPlayerNickname }),
+          created_at: readString(record, 'created_at', path)
+        };
+      })
+    };
+  }
+
  return {
    session: {
      code: readString(session, 'code', 'session_detail.session'),
@@ -129,6 +192,7 @@ function mapSessionDetail(payload: unknown): SessionDetailResponse {
      };
    }),
    round_question: roundQuestion,
+    reveal,
    phase_view_model: {
      status: readString(phase, 'status', 'session_detail.phase_view_model'),
      round_number: readNumber(phase, 'round_number', 'session_detail.phase_view_model'),
@@ -337,10 +401,7 @@ export function mapSubmitGuessResponse(payload: unknown): SubmitGuessResponse {
  const root = asRecord(payload, 'submit_guess');
  const guess = asRecord(root.guess, 'submit_guess.guess');
  const window = asRecord(root.window, 'submit_guess.window');
-  const fooledPlayerId = guess.fooled_player_id;
-  if (fooledPlayerId !== null && !isNumber(fooledPlayerId)) {
-    throw new Error('Invalid API contract: expected number|null at submit_guess.guess.fooled_player_id');
-  }
+  const fooledPlayerId = readNullableNumber(guess, 'fooled_player_id', 'submit_guess.guess');

  return {
    guess: {
--- a/frontend/src/api/types.ts
+++ b/frontend/src/api/types.ts
@@ -57,10 +57,37 @@ export interface PhaseViewModel {
  };
 }

+export interface RevealLie {
+  player_id: number;
+  nickname: string;
+  text: string;
+  created_at: string;
+}
+
+export interface RevealGuess {
+  player_id: number;
+  nickname: string;
+  selected_text: string;
+  is_correct: boolean;
+  fooled_player_id: number | null;
+  fooled_player_nickname?: string;
+  created_at: string;
+}
+
+export interface RevealPayload {
+  round_question_id: number;
+  round_number: number;
+  prompt: string;
+  correct_answer: string;
+  lies: RevealLie[];
+  guesses: RevealGuess[];
+}
+
 export interface SessionDetailResponse {
  session: SessionSummary;
  players: SessionPlayer[];
  round_question: SessionRoundQuestion | null;
+  reveal: RevealPayload | null;
  phase_view_model: PhaseViewModel;
 }

--- a/frontend/tests/angular-api-client.test.ts
+++ b/frontend/tests/angular-api-client.test.ts
@@ -1,6 +1,7 @@
 import { describe, expect, it, vi } from 'vitest';

 import { createAngularApiClient, type AngularHttpClientLike } from '../src/api/angular-client';
+import { mapSessionDetailResponse, mapSubmitGuessResponse } from '../src/api/mappers';

 describe('createAngularApiClient', () => {
  it('reads health and session detail using Django-compatible endpoints', async () => {
@@ -206,11 +207,391 @@ describe('createAngularApiClient', () => {
    }
  });

+  it('keeps canonical reveal payload stable when session detail is already in scoreboard phase', async () => {
+    const get = vi.fn<AngularHttpClientLike['get']>(async <T>(url: string) => {
+      if (url === '/lobby/sessions/ABCD12') {
+        return {
+          session: { code: 'ABCD12', status: 'scoreboard', host_id: 1, current_round: 1, players_count: 2 },
+          players: [
+            { id: 2, nickname: 'Maja', score: 10, is_connected: true },
+            { id: 3, nickname: 'Bo', score: 7, is_connected: true }
+          ],
+          round_question: {
+            id: 77,
+            round_number: 1,
+            prompt: 'Q?',
+            shown_at: '2026-03-01T18:00:00Z',
+            answers: [{ text: 'A' }, { text: 'B' }]
+          },
+          reveal: {
+            round_question_id: 77,
+            round_number: 1,
+            prompt: 'Q?',
+            correct_answer: 'A',
+            lies: [{ player_id: 2, nickname: 'Maja', text: 'B', created_at: '2026-03-01T18:00:05Z' }],
+            guesses: [
+              {
+                player_id: 3,
+                nickname: 'Bo',
+                selected_text: 'B',
+                is_correct: false,
+                fooled_player_id: 2,
+                fooled_player_nickname: 'Maja',
+                created_at: '2026-03-01T18:00:15Z'
+              }
+            ]
+          },
+          phase_view_model: {
+            status: 'scoreboard',
+            round_number: 1,
+            players_count: 2,
+            constraints: {
+              min_players_to_start: 2,
+              max_players_mvp: 8,
+              min_players_reached: true,
+              max_players_allowed: true
+            },
+            host: {
+              can_start_round: false,
+              can_show_question: false,
+              can_mix_answers: false,
+              can_calculate_scores: false,
+              can_reveal_scoreboard: false,
+              can_start_next_round: true,
+              can_finish_game: true
+            },
+            player: {
+              can_join: true,
+              can_submit_lie: false,
+              can_submit_guess: false,
+              can_view_final_result: false
+            }
+          }
+        } as T;
+      }
+      throw { status: 404, error: { error: 'Not found' } };
+    });
+
+    const client = createAngularApiClient({ get, post: vi.fn() } as unknown as AngularHttpClientLike);
+    const session = await client.getSession('abcd12');
+
+    expect(session.ok).toBe(true);
+    if (session.ok) {
+      expect(session.data.session.status).toBe('scoreboard');
+      expect(session.data.reveal?.guesses[0].fooled_player_nickname).toBe('Maja');
+      expect(session.data.phase_view_model.host.can_start_next_round).toBe(true);
+      expect(session.data.phase_view_model.host.can_finish_game).toBe(true);
+    }
+  });
+
+  it('normalizes omitted fooled_player_id to null in canonical reveal payloads', async () => {
+    const get = vi.fn<AngularHttpClientLike['get']>(async <T>(url: string) => {
+      if (url === '/lobby/sessions/ABCD12') {
+        return {
+          session: { code: 'ABCD12', status: 'reveal', host_id: 1, current_round: 1, players_count: 2 },
+          players: [
+            { id: 2, nickname: 'Maja', score: 10, is_connected: true },
+            { id: 3, nickname: 'Bo', score: 7, is_connected: true }
+          ],
+          round_question: {
+            id: 77,
+            round_number: 1,
+            prompt: 'Q?',
+            shown_at: '2026-03-01T18:00:00Z',
+            answers: [{ text: 'A' }, { text: 'B' }]
+          },
+          reveal: {
+            round_question_id: 77,
+            round_number: 1,
+            prompt: 'Q?',
+            correct_answer: 'A',
+            lies: [],
+            guesses: [
+              {
+                player_id: 3,
+                nickname: 'Bo',
+                selected_text: 'A',
+                is_correct: true,
+                created_at: '2026-03-01T18:00:15Z'
+              }
+            ]
+          },
+          phase_view_model: {
+            status: 'reveal',
+            round_number: 1,
+            players_count: 2,
+            constraints: {
+              min_players_to_start: 2,
+              max_players_mvp: 8,
+              min_players_reached: true,
+              max_players_allowed: true
+            },
+            host: {
+              can_start_round: false,
+              can_show_question: false,
+              can_mix_answers: false,
+              can_calculate_scores: false,
+              can_reveal_scoreboard: true,
+              can_start_next_round: false,
+              can_finish_game: false
+            },
+            player: {
+              can_join: true,
+              can_submit_lie: false,
+              can_submit_guess: false,
+              can_view_final_result: false
+            }
+          }
+        } as T;
+      }
+      throw { status: 404, error: { error: 'Not found' } };
+    });
+
+    const post = vi.fn<AngularHttpClientLike['post']>(async <T>(url: string, body: unknown) => {
+      if (url === '/lobby/sessions/ABCD12/questions/77/guesses/submit') {
+        expect(body).toEqual({ player_id: 9, session_token: 'tok', selected_text: 'A' });
+        return {
+          guess: {
+            id: 200,
+            player_id: 9,
+            round_question_id: 77,
+            selected_text: 'A',
+            is_correct: false,
+            created_at: '2026-03-01T16:01:00Z'
+          },
+          window: { guess_deadline_at: '2026-03-01T16:01:30Z' }
+        } as T;
+      }
+      throw { status: 404, error: { error: 'Not found' } };
+    });
+
+    const client = createAngularApiClient({ get, post } as AngularHttpClientLike);
+    const session = await client.getSession('abcd12');
+
+    expect(session.ok).toBe(true);
+    if (session.ok) {
+      expect(session.data.reveal?.guesses[0].fooled_player_id).toBeNull();
+      expect(session.data.reveal?.guesses[0]).not.toHaveProperty('fooled_player_nickname');
+    }
+
+    const submitGuess = await client.submitGuess('ABCD12', 77, {
+      player_id: 9,
+      session_token: 'tok',
+      selected_text: 'A'
+    });
+    expect(submitGuess.ok).toBe(true);
+    if (submitGuess.ok) {
+      expect(submitGuess.data.guess.fooled_player_id).toBeNull();
+    }
+  });
+
+  it('maps omitted fooled_player_id to null in submit guess mapper payloads', () => {
+    const mapped = mapSubmitGuessResponse({
+      guess: {
+        id: 200,
+        player_id: 9,
+        round_question_id: 77,
+        selected_text: 'A',
+        is_correct: false,
+        created_at: '2026-03-01T16:01:00Z'
+      },
+      window: { guess_deadline_at: '2026-03-01T16:01:30Z' }
+    });
+
+    expect(mapped.guess.fooled_player_id).toBeNull();
+  });
+
+  it('keeps fooled_player_nickname omitted when canonical reveal payload omits fooled player refs', () => {
+    const mapped = mapSessionDetailResponse({
+      session: { code: 'ABCD12', status: 'reveal', host_id: 1, current_round: 1, players_count: 2 },
+      players: [
+        { id: 2, nickname: 'Maja', score: 10, is_connected: true },
+        { id: 3, nickname: 'Bo', score: 7, is_connected: true }
+      ],
+      round_question: {
+        id: 77,
+        round_number: 1,
+        prompt: 'Q?',
+        shown_at: '2026-03-01T18:00:00Z',
+        answers: [{ text: 'A' }, { text: 'B' }]
+      },
+      reveal: {
+        round_question_id: 77,
+        round_number: 1,
+        prompt: 'Q?',
+        correct_answer: 'A',
+        lies: [],
+        guesses: [
+          {
+            player_id: 3,
+            nickname: 'Bo',
+            selected_text: 'A',
+            is_correct: true,
+            created_at: '2026-03-01T18:00:15Z'
+          }
+        ]
+      },
+      phase_view_model: {
+        status: 'reveal',
+        round_number: 1,
+        players_count: 2,
+        constraints: {
+          min_players_to_start: 2,
+          max_players_mvp: 8,
+          min_players_reached: true,
+          max_players_allowed: true
+        },
+        host: {
+          can_start_round: false,
+          can_show_question: false,
+          can_mix_answers: false,
+          can_calculate_scores: false,
+          can_reveal_scoreboard: true,
+          can_start_next_round: false,
+          can_finish_game: false
+        },
+        player: {
+          can_join: true,
+          can_submit_lie: false,
+          can_submit_guess: false,
+          can_view_final_result: false
+        }
+      }
+    });
+
+    expect(mapped.reveal?.guesses[0].fooled_player_id).toBeNull();
+    expect(mapped.reveal?.guesses[0]).not.toHaveProperty('fooled_player_nickname');
+  });
+
+  it('rejects canonical reveal payloads that include fooled_player_nickname without fooled_player_id', () => {
+    expect(() =>
+      mapSessionDetailResponse({
+        session: { code: 'ABCD12', status: 'reveal', host_id: 1, current_round: 1, players_count: 2 },
+        players: [
+          { id: 2, nickname: 'Maja', score: 10, is_connected: true },
+          { id: 3, nickname: 'Bo', score: 7, is_connected: true }
+        ],
+        round_question: {
+          id: 77,
+          round_number: 1,
+          prompt: 'Q?',
+          shown_at: '2026-03-01T18:00:00Z',
+          answers: [{ text: 'A' }, { text: 'B' }]
+        },
+        reveal: {
+          round_question_id: 77,
+          round_number: 1,
+          prompt: 'Q?',
+          correct_answer: 'A',
+          lies: [],
+          guesses: [
+            {
+              player_id: 3,
+              nickname: 'Bo',
+              selected_text: 'A',
+              is_correct: true,
+              fooled_player_nickname: 'Maja',
+              created_at: '2026-03-01T18:00:15Z'
+            }
+          ]
+        },
+        phase_view_model: {
+          status: 'reveal',
+          round_number: 1,
+          players_count: 2,
+          constraints: {
+            min_players_to_start: 2,
+            max_players_mvp: 8,
+            min_players_reached: true,
+            max_players_allowed: true
+          },
+          host: {
+            can_start_round: false,
+            can_show_question: false,
+            can_mix_answers: false,
+            can_calculate_scores: false,
+            can_reveal_scoreboard: true,
+            can_start_next_round: false,
+            can_finish_game: false
+          },
+          player: {
+            can_join: true,
+            can_submit_lie: false,
+            can_submit_guess: false,
+            can_view_final_result: false
+          }
+        }
+      })
+    ).toThrow('fooled_player_nickname to be omitted when fooled_player_id is null');
+  });
+
+  it('rejects canonical reveal payloads that omit fooled_player_nickname when fooled_player_id is set', () => {
+    expect(() =>
+      mapSessionDetailResponse({
+        session: { code: 'ABCD12', status: 'reveal', host_id: 1, current_round: 1, players_count: 2 },
+        players: [
+          { id: 2, nickname: 'Maja', score: 10, is_connected: true },
+          { id: 3, nickname: 'Bo', score: 7, is_connected: true }
+        ],
+        round_question: {
+          id: 77,
+          round_number: 1,
+          prompt: 'Q?',
+          shown_at: '2026-03-01T18:00:00Z',
+          answers: [{ text: 'A' }, { text: 'B' }]
+        },
+        reveal: {
+          round_question_id: 77,
+          round_number: 1,
+          prompt: 'Q?',
+          correct_answer: 'A',
+          lies: [],
+          guesses: [
+            {
+              player_id: 3,
+              nickname: 'Bo',
+              selected_text: 'B',
+              is_correct: false,
+              fooled_player_id: 2,
+              created_at: '2026-03-01T18:00:15Z'
+            }
+          ]
+        },
+        phase_view_model: {
+          status: 'reveal',
+          round_number: 1,
+          players_count: 2,
+          constraints: {
+            min_players_to_start: 2,
+            max_players_mvp: 8,
+            min_players_reached: true,
+            max_players_allowed: true
+          },
+          host: {
+            can_start_round: false,
+            can_show_question: false,
+            can_mix_answers: false,
+            can_calculate_scores: false,
+            can_reveal_scoreboard: true,
+            can_start_next_round: false,
+            can_finish_game: false
+          },
+          player: {
+            can_join: true,
+            can_submit_lie: false,
+            can_submit_guess: false,
+            can_view_final_result: false
+          }
+        }
+      })
+    ).toThrow('fooled_player_nickname when fooled_player_id is set');
+  });
+
  it('maps host/player gameplay endpoints through typed response mappers', async () => {
    const get = vi.fn<AngularHttpClientLike['get']>(async <T>(url: string) => {
      if (url === '/lobby/sessions/ABCD12/scoreboard') {
        return {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
+          session: { code: 'ABCD12', status: 'scoreboard', current_round: 1 },
          leaderboard: [
            { id: 2, nickname: 'Maja', score: 11 },
            { id: 3, nickname: 'Bo', score: 7 }
@@ -245,7 +626,7 @@ describe('createAngularApiClient', () => {
      if (url === '/lobby/sessions/ABCD12/questions/77/scores/calculate') {
        expect(body).toEqual({});
        return {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
+          session: { code: 'ABCD12', status: 'scoreboard', current_round: 1 },
          round_question: { id: 77, round_number: 1 },
          events_created: 3,
          leaderboard: [{ id: 2, nickname: 'Maja', score: 11 }]
@@ -253,7 +634,7 @@ describe('createAngularApiClient', () => {
      }
      if (url === '/lobby/sessions/ABCD12/rounds/next') {
        expect(body).toEqual({});
-        return { session: { code: 'ABCD12', status: 'lobby', current_round: 2 } } as T;
+        return { session: { code: 'ABCD12', status: 'lie', current_round: 2 } } as T;
      }
      if (url === '/lobby/sessions/ABCD12/finish') {
        expect(body).toEqual({});
--- a/frontend/tests/gameplay-phase-machine.test.ts
+++ b/frontend/tests/gameplay-phase-machine.test.ts
@@ -42,6 +42,7 @@ describe('gameplay phase machine skeleton', () => {
        session: { code: 'ABCD12', status: 'lie', host_id: 1, current_round: 1, players_count: 3 },
        players: [],
        round_question: null,
+        reveal: null,
        phase_view_model: {
          status: 'lie',
          round_number: 1,
@@ -76,6 +77,7 @@ describe('gameplay phase machine skeleton', () => {
        session: { code: 'ABCD12', status: 'finished', host_id: 1, current_round: 1, players_count: 3 },
        players: [],
        round_question: null,
+        reveal: null,
        phase_view_model: {
          status: 'finished',
          round_number: 1,
--- a/frontend/tests/vertical-slice.test.ts
+++ b/frontend/tests/vertical-slice.test.ts
@@ -16,6 +16,7 @@ function makeApiMock(overrides?: Partial<ApiClient>): ApiClient {
        session: { code: 'ABCD12', status: 'lobby', host_id: 1, current_round: 1, players_count: 3 },
        players: [],
        round_question: null,
+        reveal: null,
        phase_view_model: {
          status: 'lobby',
          round_number: 1,
--- a/fupogfakta/migrations/0005_alter_gamesession_status.py
+++ b/fupogfakta/migrations/0005_alter_gamesession_status.py
@@ -0,0 +1,18 @@
+# Generated by Django 6.0.2 on 2026-03-13 16:05
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('fupogfakta', '0004_player_session_token'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='gamesession',
+            name='status',
+            field=models.CharField(choices=[('lobby', 'Lobby'), ('lie', 'Løgnfase'), ('guess', 'Gættefase'), ('reveal', 'Reveal'), ('scoreboard', 'Scoreboard'), ('finished', 'Afsluttet')], default='lobby', max_length=16),
+        ),
+    ]
--- a/fupogfakta/migrations/0005_gamesession_scoreboard_status.py
+++ b/fupogfakta/migrations/0005_gamesession_scoreboard_status.py
@@ -0,0 +1,26 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("fupogfakta", "0004_player_session_token"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="gamesession",
+            name="status",
+            field=models.CharField(
+                choices=[
+                    ("lobby", "Lobby"),
+                    ("lie", "Løgnfase"),
+                    ("guess", "Gættefase"),
+                    ("reveal", "Reveal"),
+                    ("scoreboard", "Scoreboard"),
+                    ("finished", "Afsluttet"),
+                ],
+                default="lobby",
+                max_length=16,
+            ),
+        ),
+    ]
--- a/fupogfakta/migrations/0006_merge_20260315_1249.py
+++ b/fupogfakta/migrations/0006_merge_20260315_1249.py
@@ -0,0 +1,10 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("fupogfakta", "0005_alter_gamesession_status"),
+        ("fupogfakta", "0005_gamesession_scoreboard_status"),
+    ]
+
+    operations = []
--- a/fupogfakta/models.py
+++ b/fupogfakta/models.py
@@ -42,6 +42,7 @@ class GameSession(models.Model):
        LIE = "lie", "Løgnfase"
        GUESS = "guess", "Gættefase"
        REVEAL = "reveal", "Reveal"
+        SCOREBOARD = "scoreboard", "Scoreboard"
        FINISHED = "finished", "Afsluttet"

    host = models.ForeignKey(User, on_delete=models.PROTECT, related_name="hosted_sessions")
--- a/lobby/i18n.py
+++ b/lobby/i18n.py
@@ -24,6 +24,15 @@ def lobby_i18n_error_messages() -> dict:
    return shared_i18n_catalog().get("backend", {}).get("errors", {})


+def resolve_error_key(code: str) -> str:
+    resolved = lobby_i18n_errors().get(code)
+    if isinstance(resolved, str) and resolved:
+        return resolved
+
+    LOGGER.warning("i18n error code missing in shared catalog", extra={"code": code})
+    return code
+
+
 def _quality_value(language_candidate: str) -> float | None:
    for parameter in language_candidate.split(";")[1:]:
        key, separator, value = parameter.partition("=")
@@ -78,12 +87,13 @@ def resolve_error_message(*, key: str, locale: str) -> str:
    return key


-def api_error(request: HttpRequest, *, key: str, status: int) -> JsonResponse:
+def api_error(request: HttpRequest, *, code: str, status: int) -> JsonResponse:
    locale = resolve_locale(request)
+    key = resolve_error_key(code)
    return JsonResponse(
        {
            "error": resolve_error_message(key=key, locale=locale),
-            "error_code": key,
+            "error_code": code,
            "locale": locale,
        },
        status=status,
--- a/lobby/management/commands/smoke_staging.py
+++ b/lobby/management/commands/smoke_staging.py
@@ -70,12 +70,9 @@ class Command(BaseCommand):
        if start_res.status_code != 201:
            raise CommandError(f"start_round failed: {start_res.status_code}")

-        show_res = host_client.post(f"/lobby/sessions/{code}/questions/show", content_type="application/json")
-        if show_res.status_code != 201:
-            raise CommandError(f"show_question failed: {show_res.status_code}")
-
-        round_question_id = show_res.json()["round_question"]["id"]
+        round_question_id = start_res.json()["round_question"]["id"]

+        answers = []
        for player in players:
            nick = player["nickname"]
            lie_res = Client().post(
@@ -91,17 +88,17 @@ class Command(BaseCommand):
            )
            if lie_res.status_code != 201:
                raise CommandError(f"submit_lie failed for {nick}: {lie_res.status_code}")
+            if lie_res.json().get("answers"):
+                answers = lie_res.json()["answers"]

-        mix_res = host_client.post(
-            f"/lobby/sessions/{code}/questions/{round_question_id}/answers/mix",
-            content_type="application/json",
-        )
-        if mix_res.status_code != 200:
-            raise CommandError(f"mix_answers failed: {mix_res.status_code}")
-
-        answers = mix_res.json().get("answers", [])
        if not answers:
-            raise CommandError("mix_answers returned empty answers")
+            detail_res = host_client.get(f"/lobby/sessions/{code}")
+            if detail_res.status_code != 200:
+                raise CommandError(f"session_detail after lies failed: {detail_res.status_code}")
+            answers = detail_res.json().get("round_question", {}).get("answers", [])
+
+        if not answers:
+            raise CommandError("canonical lie->guess transition returned empty answers")

        for player in players:
            nick = player["nickname"]
@@ -120,16 +117,11 @@ class Command(BaseCommand):
            if guess_res.status_code != 201:
                raise CommandError(f"submit_guess failed for {nick}: {guess_res.status_code}")

-        calc_res = host_client.post(
-            f"/lobby/sessions/{code}/questions/{round_question_id}/scores/calculate",
-            content_type="application/json",
-        )
-        if calc_res.status_code != 200:
-            raise CommandError(f"calculate_scores failed: {calc_res.status_code}")
-
-        board_res = host_client.get(f"/lobby/sessions/{code}/scoreboard")
-        if board_res.status_code != 200:
-            raise CommandError(f"reveal_scoreboard failed: {board_res.status_code}")
+        detail_res = host_client.get(f"/lobby/sessions/{code}")
+        if detail_res.status_code != 200:
+            raise CommandError(f"session_detail after guesses failed: {detail_res.status_code}")
+        if detail_res.json()["session"]["status"] != GameSession.Status.SCOREBOARD:
+            raise CommandError("canonical guess->reveal->scoreboard transition did not reach scoreboard")

        finish_res = host_client.post(f"/lobby/sessions/{code}/finish", content_type="application/json")
        if finish_res.status_code != 200:
@@ -148,12 +140,10 @@ class Command(BaseCommand):
                    "create_session",
                    "join_players",
                    "start_round",
-                    "show_question",
                    "submit_lies",
-                    "mix_answers",
+                    "auto_guess_transition",
                    "submit_guesses",
-                    "calculate_scores",
-                    "reveal_scoreboard",
+                    "auto_reveal_to_scoreboard",
                    "finish_game",
                ],
            }
--- a/lobby/templates/lobby/host_screen.html
+++ b/lobby/templates/lobby/host_screen.html
@@ -24,14 +24,10 @@
 <p id="categoryGuardHint">Kategori er kun redigérbar i lobby-fasen.</p>

 <p id="phaseStatus">Fase: ukendt (opdatér session-status).</p>
-<button id="showQuestionBtn" onclick="showQuestion()" disabled>3) Vis spørgsmål</button>
-<input id="roundQuestionId" placeholder="Round question id">
-<p id="roundQuestionGuardHint">Round question-id kan kun redigeres i lie/guess/reveal-faser.</p>
-<button id="mixAnswersBtn" onclick="mixAnswers()" disabled>4) Mix svar</button>
-<button id="calcScoresBtn" onclick="calcScores()" disabled>5) Beregn score</button>
-<button id="showScoreboardBtn" onclick="showScoreboard()" disabled>6) Scoreboard</button>
-<button id="nextRoundBtn" onclick="nextRound()" disabled>7) Næste runde</button>
-<button id="finishGameBtn" onclick="finishGame()" disabled>8) Afslut spil</button>
+<p id="roundQuestionStatus">Aktiv round question: afventer session-status.</p>
+<p id="roundQuestionGuardHint">Round question-id styres server-side i canonical flow og er kun read-only kontekst for host.</p>
+<button id="nextRoundBtn" onclick="nextRound()" disabled>3) Næste runde</button>
+<button id="finishGameBtn" onclick="finishGame()" disabled>4) Afslut spil</button>
 <p id="hostActionHint">Angiv sessionkode for at aktivere host-actions.</p>
 <p id="hostErrorHint">Ingen fejl.</p>
 <button id="sessionDetailBtn" onclick="sessionDetail()">Session-status</button>
@@ -55,8 +51,12 @@
  <p id="hostCriticalPlayers">Spillere: afventer</p>
  <p id="hostCriticalRound">Aktiv round question: afventer</p>
 </section>
-<pre id="out">Klar.</pre>
+<pre id="out">Ready.</pre>
+{{ lobby_i18n|json_script:"wppHostI18n" }}
 <script>
+var WPP_HOST_LOCALE="{{ shell_locale|default:'en'|escapejs }}";
+var WPP_HOST_I18N=JSON.parse(document.getElementById("wppHostI18n").textContent||"{}");
+function hostCopy(path,fallback){var node=WPP_HOST_I18N;var parts=(path||"").split(".");for(var i=0;i<parts.length;i++){if(!node||typeof node!=="object"){return fallback||path;}node=node[parts[i]];}if(node&&typeof node==="object"){if(node[WPP_HOST_LOCALE]){return node[WPP_HOST_LOCALE];}if(node.en){return node.en;}}return typeof node==="string"?node:(fallback||path);} 
 var currentSessionStatus="";
 var autoRefreshEnabled=false;
 var autoRefreshTimer=null;
@@ -65,14 +65,15 @@ var lastRefreshAtLabel="";
 var lastRefreshFailed=false;
 var sessionDetailInFlight=false;
 var hostShellRouteHint="";
-var HOST_SHELL_ROUTES={lobby:"lobby",lie:"lie",guess:"guess",reveal:"reveal",finished:"finished"};
+var HOST_SHELL_ROUTES={lobby:"lobby",lie:"lie",guess:"guess",reveal:"reveal",scoreboard:"scoreboard",finished:"finished"};
 var hostShellFatalError=false;
 var hostShellRecoverInFlight=false;
 var hostCriticalHydrated=false;
 function setHostCriticalLoading(isLoading){var skeleton=document.getElementById("hostCriticalSkeleton");var view=document.getElementById("hostCriticalView");if(!skeleton||!view){return;}skeleton.style.display=isLoading?"block":"none";view.style.display=isLoading?"none":"block";}
-function hydrateHostCriticalView(data){var session=(data&&data.session)||{};var phaseEl=document.getElementById("hostCriticalPhase");var playersEl=document.getElementById("hostCriticalPlayers");var roundEl=document.getElementById("hostCriticalRound");if(phaseEl){phaseEl.textContent="Fase: "+phaseLabel(currentSessionStatus||session.status||"");}
+function hydrateHostCriticalView(data){var session=(data&&data.session)||{};var phaseEl=document.getElementById("hostCriticalPhase");var playersEl=document.getElementById("hostCriticalPlayers");var roundEl=document.getElementById("hostCriticalRound");var roundStatus=document.getElementById("roundQuestionStatus");var roundQuestionId=(data&&data.round_question&&data.round_question.id)?String(data.round_question.id):"";if(phaseEl){phaseEl.textContent="Fase: "+phaseLabel(currentSessionStatus||session.status||"");}
 if(playersEl){playersEl.textContent="Spillere: "+(typeof session.players_count==="number"?session.players_count:"ukendt");}
-if(roundEl){roundEl.textContent="Aktiv round question: "+(rq()||"ikke valgt");}
+if(roundEl){roundEl.textContent="Aktiv round question: "+(roundQuestionId||"ikke valgt");}
+if(roundStatus){roundStatus.textContent="Aktiv round question: "+(roundQuestionId||"afventer session-status.");}
 hostCriticalHydrated=true;
 setHostCriticalLoading(false);
 }
@@ -82,10 +83,9 @@ function setHostShellFatalError(detail){hostShellFatalError=true;var out=documen
 function clearHostShellFatalError(){hostShellFatalError=false;hostShellRecoverInFlight=false;updateHostShellErrorBoundary();}
 function recoverHostShell(mode){if(hostShellRecoverInFlight){return Promise.resolve({error:"recover_in_flight"});}hostShellRecoverInFlight=true;updateHostShellErrorBoundary();if(mode==="reload"){window.location.reload();return Promise.resolve({ok:true});}if(!code()){hostShellRecoverInFlight=false;updateHostShellErrorBoundary();return Promise.resolve({error:"missing_session_code"});}return sessionDetail().then(function(result){clearHostShellFatalError();return result;}).catch(function(err){hostShellRecoverInFlight=false;updateHostShellErrorBoundary();throw err;});}
 function code(){return document.getElementById("code").value.trim().toUpperCase();}
-function rq(){return document.getElementById("roundQuestionId").value.trim();}
-function saveHostContext(){try{localStorage.setItem("wppHostContext",JSON.stringify({code:code(),round_question_id:rq(),session_status:currentSessionStatus||"",auto_refresh:autoRefreshEnabled}));}catch(_e){}}
-function restoreHostContext(){try{var raw=localStorage.getItem("wppHostContext");if(!raw){return false;}var ctx=JSON.parse(raw);if(ctx.code){document.getElementById("code").value=(ctx.code||"").toUpperCase();}if(ctx.round_question_id){document.getElementById("roundQuestionId").value=ctx.round_question_id;}if(ctx.session_status){currentSessionStatus=ctx.session_status;}autoRefreshEnabled=!!ctx.auto_refresh;updateAutoRefreshUi();return !!ctx.code;}catch(_e){return false;}}
-function phaseLabel(status){if(status==="lobby"){return"Lobby";}if(status==="lie"){return"Løgn";}if(status==="guess"){return"Gæt";}if(status==="reveal"){return"Reveal";}if(status==="finished"){return"Afsluttet";}return"Ukendt";}
+function saveHostContext(){try{localStorage.setItem("wppHostContext",JSON.stringify({code:code(),session_status:currentSessionStatus||"",auto_refresh:autoRefreshEnabled}));}catch(_e){}}
+function restoreHostContext(){try{var raw=localStorage.getItem("wppHostContext");if(!raw){return false;}var ctx=JSON.parse(raw);if(ctx.code){document.getElementById("code").value=(ctx.code||"").toUpperCase();}if(ctx.session_status){currentSessionStatus=ctx.session_status;}autoRefreshEnabled=!!ctx.auto_refresh;updateAutoRefreshUi();return !!ctx.code;}catch(_e){return false;}}
+function phaseLabel(status){if(status==="lobby"){return"Lobby";}if(status==="lie"){return"Lie";}if(status==="guess"){return"Guess";}if(status==="reveal"){return"Reveal";}if(status==="scoreboard"){return"Scoreboard";}if(status==="finished"){return"Finished";}return"Unknown";}
 function hostShellRouteFromPath(){var marker="/lobby/ui/host";var path=(window.location.pathname||"").toLowerCase();var idx=path.indexOf(marker);if(idx===-1){return"";}var remainder=path.slice(idx+marker.length).replace(/^\/+|\/+$/g,"");if(!remainder){return"";}var route=remainder.split("/")[0];return HOST_SHELL_ROUTES[route]?route:"";}
 function expectedHostShellRoute(){return HOST_SHELL_ROUTES[currentSessionStatus]||"";}
 function syncHostShellRoute(){var currentRoute=hostShellRouteFromPath();var expectedRoute=expectedHostShellRoute();if(!currentRoute||!expectedRoute){hostShellRouteHint="";return;}if(currentRoute===expectedRoute){hostShellRouteHint="";return;}var nextPath="/lobby/ui/host/"+expectedRoute;window.history.replaceState(null,"",nextPath);hostShellRouteHint="Deep-link route guard: omdirigeret fra /"+currentRoute+" til /"+expectedRoute+" for fase "+phaseLabel(currentSessionStatus)+".";}
@@ -93,31 +93,27 @@ function updateAutoRefreshUi(){var btn=document.getElementById("autoRefreshToggl
 function stopAutoRefresh(reason){autoRefreshEnabled=false;if(autoRefreshTimer){clearInterval(autoRefreshTimer);autoRefreshTimer=null;}if(reason){var hint=document.getElementById("autoRefreshHint");if(hint){hint.textContent=reason;}}updateAutoRefreshUi();saveHostContext();}
 function startAutoRefresh(){if(!code()){updateAutoRefreshUi();return;}autoRefreshEnabled=true;if(autoRefreshTimer){clearInterval(autoRefreshTimer);}autoRefreshTimer=setInterval(function(){if(!code()||sessionDetailInFlight){return;}if(currentSessionStatus==="finished"){stopAutoRefresh("Auto-refresh stoppet: spillet er afsluttet.");return;}sessionDetail();},10000);updateAutoRefreshUi();saveHostContext();}
 function toggleAutoRefresh(){if(hostActionInFlight||sessionDetailInFlight||!code()){updateAutoRefreshUi();return;}if(autoRefreshEnabled){stopAutoRefresh();return;}startAutoRefresh();}
-function formatTimeLabel(dateObj){return dateObj.toLocaleTimeString("da-DK",{hour12:false});}
+function formatTimeLabel(dateObj){return dateObj.toLocaleTimeString(WPP_HOST_LOCALE,{hour12:false});}
 function markSessionRefresh(status){if(status>=200&&status<300){lastRefreshAtLabel=formatTimeLabel(new Date());lastRefreshFailed=false;}else{lastRefreshFailed=true;}updateLastRefreshStatus();}
 function updateLastRefreshStatus(){var el=document.getElementById("lastRefreshStatus");if(!el){return;}if(!lastRefreshAtLabel){el.textContent=lastRefreshFailed?"Session-data kan være forældet (ingen succesfuld opdatering endnu).":"Session-data ikke opdateret endnu.";return;}if(lastRefreshFailed){el.textContent="Session-data kan være forældet (seneste succes: "+lastRefreshAtLabel+").";return;}el.textContent="Sidst opdateret: "+lastRefreshAtLabel+".";}
 function normalizeApiError(data){if(!data||typeof data!=="object"){return"";}return (data.error_code||data.error||"").toString();}
-function mapUiErrorMessage(errorKey){if(!errorKey){return"";}var key=errorKey.toLowerCase();if(key.indexOf("phase")!==-1){return"Ugyldig fase for handlingen. Opdatér session-status og prøv igen.";}if(key.indexOf("token")!==-1||key.indexOf("auth")!==-1){return"Session-token er ugyldig eller udløbet. Rejoin sessionen og prøv igen.";}if(key.indexOf("round")!==-1||key.indexOf("question")!==-1||key.indexOf("state")!==-1){return"Runde-kontekst matcher ikke længere. Opdatér session-status før næste handling.";}if(key.indexOf("session")!==-1){return"Sessionkoden er ugyldig eller sessionen findes ikke længere.";}return"Handling fejlede. Opdatér session-status og prøv igen.";}
+function mapUiErrorMessage(errorKey){if(!errorKey){return"";}var key=errorKey.toLowerCase();if(WPP_HOST_I18N&&WPP_HOST_I18N.backend&&WPP_HOST_I18N.backend.errors&&WPP_HOST_I18N.backend.errors[key]){return hostCopy("backend.errors."+key,"Action failed. Refresh state and retry.");}if(key.indexOf("session")!==-1){return hostCopy("backend.errors.session_not_found_or_closed","Session code is invalid, or session no longer exists.");}return hostCopy("backend.errors.generic_action_failed_retry","Action failed. Refresh state and retry.");}
 function updateErrorHint(status,data){var el=document.getElementById("hostErrorHint");if(!el){return;}if(status>=200&&status<300){el.textContent="Ingen fejl.";return;}var errKey=normalizeApiError(data);el.textContent="Fejl: "+mapUiErrorMessage(errKey)+" ("+(errKey||("http_"+status))+")";}
 function updateCreateSessionState(){var btn=document.getElementById("createSessionBtn");var hint=document.getElementById("createSessionHint");if(btn){btn.disabled=hostActionInFlight||sessionDetailInFlight;}if(!hint){return;}if(hostActionInFlight){hint.textContent="Opret session er låst mens en host-handling kører.";return;}if(sessionDetailInFlight){hint.textContent="Opret session er låst mens session-opdatering kører.";return;}hint.textContent="Opret session er klar.";}function updateSessionDetailState(){var btn=document.getElementById("sessionDetailBtn");var hint=document.getElementById("sessionDetailHint");var codeInput=document.getElementById("code");if(btn){btn.disabled=sessionDetailInFlight||hostActionInFlight||!code();}if(codeInput){codeInput.readOnly=sessionDetailInFlight||hostActionInFlight;}if(!hint){return;}if(sessionDetailInFlight){hint.textContent="Opdaterer session-status…";return;}if(hostActionInFlight){hint.textContent="Session-opdatering er låst mens en host-handling kører.";return;}if(!code()){hint.textContent="Angiv sessionkode for at opdatere session-status.";updateHostShellErrorBoundary();return;}hint.textContent="Session-opdatering klar.";updateHostShellErrorBoundary();}

 function updatePhaseStatus(){var el=document.getElementById("phaseStatus");syncHostShellRoute();if(!el){return;}if(!currentSessionStatus){el.textContent="Fase: ukendt (opdatér session-status).";return;}el.textContent="Fase: "+phaseLabel(currentSessionStatus)+" ("+currentSessionStatus+")";}
 function syncStartRoundGuard(data){var btn=document.getElementById("startRoundBtn");var hint=document.getElementById("startRoundHint");var status=document.getElementById("playerCountStatus");if(!btn||!hint||!status){return;}var count=(data&&data.session&&typeof data.session.players_count==="number")?data.session.players_count:null;var phase=currentSessionStatus||"";if(phase&&phase!=="lobby"){btn.disabled=true;status.textContent=count===null?"Spillere i session: ukendt":"Spillere i session: "+count;hint.textContent="Start runde er kun tilladt i lobby-fasen.";return;}if(count===null){btn.disabled=true;status.textContent="Spillere i session: ukendt";hint.textContent="Opdatér session-status for at validere 3-5 spillere.";return;}status.textContent="Spillere i session: "+count;if(count<3){btn.disabled=true;hint.textContent="Mangler spillere: kræver mindst 3 for at starte runde.";return;}if(count>5){btn.disabled=true;hint.textContent="For mange spillere: maks 5 i MVP før runde-start.";return;}btn.disabled=false;hint.textContent="Klar: spillerantal er indenfor 3-5 til runde-start.";}

-function updateHostActionState(){updateCreateSessionState();var hasCode=!!code();var hasRound=!!rq();var phase=currentSessionStatus||"";var showQuestionBtn=document.getElementById("showQuestionBtn");var mixAnswersBtn=document.getElementById("mixAnswersBtn");var calcScoresBtn=document.getElementById("calcScoresBtn");var showScoreboardBtn=document.getElementById("showScoreboardBtn");var nextRoundBtn=document.getElementById("nextRoundBtn");var finishGameBtn=document.getElementById("finishGameBtn");var roundQuestionInput=document.getElementById("roundQuestionId");var roundQuestionGuardHint=document.getElementById("roundQuestionGuardHint");var categorySelect=document.getElementById("category");var categoryGuardHint=document.getElementById("categoryGuardHint");var hint=document.getElementById("hostActionHint");if(showQuestionBtn){showQuestionBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="lie";}if(showScoreboardBtn){showScoreboardBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="reveal";}if(nextRoundBtn){nextRoundBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="reveal";}if(finishGameBtn){finishGameBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="reveal";}if(mixAnswersBtn){mixAnswersBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||!hasRound||(phase!=="lie"&&phase!=="guess");}if(calcScoresBtn){calcScoresBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||!hasRound||phase!=="guess";}var canEditRoundQuestion=!!hasCode&&(phase==="lie"||phase==="guess"||phase==="reveal");if(roundQuestionInput){roundQuestionInput.disabled=hostActionInFlight||sessionDetailInFlight||!canEditRoundQuestion;}if(roundQuestionGuardHint){if(hostActionInFlight){roundQuestionGuardHint.textContent="Round question-id er låst mens en handling kører.";}else if(sessionDetailInFlight){roundQuestionGuardHint.textContent="Round question-id er låst mens session-opdatering kører.";}else if(!hasCode){roundQuestionGuardHint.textContent="Angiv sessionkode for at redigere round question-id.";}else if(!phase){roundQuestionGuardHint.textContent="Opdatér session-status for round question-id.";}else if(canEditRoundQuestion){roundQuestionGuardHint.textContent="Round question-id kan redigeres i fase: "+phaseLabel(phase)+".";}else{roundQuestionGuardHint.textContent="Round question-id er låst i fase: "+phaseLabel(phase)+".";}}if(categorySelect){categorySelect.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="lobby";}if(categoryGuardHint){if(hostActionInFlight){categoryGuardHint.textContent="Kategori er midlertidigt låst mens en handling kører.";}else if(sessionDetailInFlight){categoryGuardHint.textContent="Kategori er låst mens session-opdatering kører.";}else if(!hasCode){categoryGuardHint.textContent="Angiv sessionkode for at låse kategori til lobby-fasen.";}else if(phase==="lobby"){categoryGuardHint.textContent="Kategori kan vælges i lobby-fasen.";}else if(!phase){categoryGuardHint.textContent="Opdatér session-status for at validere kategori-lås.";}else{categoryGuardHint.textContent="Kategori er låst udenfor lobby-fasen.";}}if(!hint){return;}if(hostActionInFlight){hint.textContent="Handling kører… afvent svar før næste klik.";return;}if(sessionDetailInFlight){hint.textContent="Host-actions er låst mens session-opdatering kører.";return;}if(!hasCode){hint.textContent="Angiv sessionkode for at aktivere host-actions.";return;}if(!phase){hint.textContent="Opdatér session-status for fasebaserede host-actions.";return;}if(phase==="finished"){hint.textContent="Spillet er afsluttet: gameplay-actions er låst.";return;}if((phase==="lie"||phase==="guess")&&!hasRound){hint.textContent="Round question id mangler: mix/beregn score er låst.";return;}if(hostShellRouteHint){hint.textContent=hostShellRouteHint;return;}hint.textContent="Host-actions er klar for fase: "+phaseLabel(phase)+".";}
-async function api(path,method,payload){var o={method:method||"GET",headers:{"Accept":"application/json"}};if(payload!==null){o.headers["Content-Type"]="application/json";o.headers["X-CSRFToken"]=csrf();o.body=JSON.stringify(payload);}var r=await fetch(path,o);var d=await r.json().catch(function(){return {};});var isSessionDetailRead=(method||"GET")==="GET"&&/^\/lobby\/sessions\/[A-Z0-9]+$/.test(path);if(isSessionDetailRead){markSessionRefresh(r.status);}document.getElementById("out").textContent=JSON.stringify({status:r.status,data:d},null,2);if(d.session&&d.session.code){document.getElementById("code").value=d.session.code;}if(d.session&&d.session.status){currentSessionStatus=d.session.status;}if(d.round_question&&d.round_question.id){document.getElementById("roundQuestionId").value=d.round_question.id;}if(d.session){hydrateHostCriticalView(d);}updateErrorHint(r.status,d);updatePhaseStatus();syncStartRoundGuard(d);updateHostActionState();if(currentSessionStatus==="finished"&&autoRefreshEnabled){stopAutoRefresh("Auto-refresh stoppet: spillet er afsluttet.");}else{updateAutoRefreshUi();}if(hostShellFatalError){clearHostShellFatalError();}saveHostContext();return d;}
+function updateHostActionState(){updateCreateSessionState();var hasCode=!!code();var phase=currentSessionStatus||"";var nextRoundBtn=document.getElementById("nextRoundBtn");var finishGameBtn=document.getElementById("finishGameBtn");var roundQuestionGuardHint=document.getElementById("roundQuestionGuardHint");var categorySelect=document.getElementById("category");var categoryGuardHint=document.getElementById("categoryGuardHint");var hint=document.getElementById("hostActionHint");if(nextRoundBtn){nextRoundBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="scoreboard";}if(finishGameBtn){finishGameBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="scoreboard";}if(roundQuestionGuardHint){if(hostActionInFlight){roundQuestionGuardHint.textContent="Round question-id er låst mens en handling kører.";}else if(sessionDetailInFlight){roundQuestionGuardHint.textContent="Round question-id er låst mens session-opdatering kører.";}else if(!hasCode){roundQuestionGuardHint.textContent="Angiv sessionkode for at se aktiv round question.";}else if(!phase){roundQuestionGuardHint.textContent="Opdatér session-status for round question-kontekst.";}else{roundQuestionGuardHint.textContent="Round question-id styres server-side i canonical flow og er read-only i fase: "+phaseLabel(phase)+".";}}if(categorySelect){categorySelect.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="lobby";}if(categoryGuardHint){if(hostActionInFlight){categoryGuardHint.textContent="Kategori er midlertidigt låst mens en handling kører.";}else if(sessionDetailInFlight){categoryGuardHint.textContent="Kategori er låst mens session-opdatering kører.";}else if(!hasCode){categoryGuardHint.textContent="Angiv sessionkode for at låse kategori til lobby-fasen.";}else if(phase==="lobby"){categoryGuardHint.textContent="Kategori kan vælges i lobby-fasen.";}else if(!phase){categoryGuardHint.textContent="Opdatér session-status for at validere kategori-lås.";}else{categoryGuardHint.textContent="Kategori er låst udenfor lobby-fasen.";}}if(!hint){return;}if(hostActionInFlight){hint.textContent="Handling kører… afvent svar før næste klik.";return;}if(sessionDetailInFlight){hint.textContent="Host-actions er låst mens session-opdatering kører.";return;}if(!hasCode){hint.textContent="Angiv sessionkode for at aktivere host-actions.";return;}if(!phase){hint.textContent="Opdatér session-status for fasebaserede host-actions.";return;}if(phase==="finished"){hint.textContent="Spillet er afsluttet: gameplay-actions er låst.";return;}if(phase==="scoreboard"){hint.textContent="Host-actions er klar: vælg næste runde eller afslut spillet.";return;}if(hostShellRouteHint){hint.textContent=hostShellRouteHint;return;}hint.textContent="Mid-round faseskift er server-styrede i canonical flow. Host monitorerer kun fremdrift i fase: "+phaseLabel(phase)+".";}
+async function api(path,method,payload){var o={method:method||"GET",headers:{"Accept":"application/json"}};if(payload!==null){o.headers["Content-Type"]="application/json";o.headers["X-CSRFToken"]=csrf();o.body=JSON.stringify(payload);}var r=await fetch(path,o);var d=await r.json().catch(function(){return {};});var isSessionDetailRead=(method||"GET")==="GET"&&/^\/lobby\/sessions\/[A-Z0-9]+$/.test(path);if(isSessionDetailRead){markSessionRefresh(r.status);}document.getElementById("out").textContent=JSON.stringify({status:r.status,data:d},null,2);if(d.session&&d.session.code){document.getElementById("code").value=d.session.code;}if(d.session&&d.session.status){currentSessionStatus=d.session.status;}if(d.session){hydrateHostCriticalView(d);}updateErrorHint(r.status,d);updatePhaseStatus();syncStartRoundGuard(d);updateHostActionState();if(currentSessionStatus==="finished"&&autoRefreshEnabled){stopAutoRefresh("Auto-refresh stoppet: spillet er afsluttet.");}else{updateAutoRefreshUi();}if(hostShellFatalError){clearHostShellFatalError();}saveHostContext();return d;}

 function withHostActionLock(fn){if(hostActionInFlight){return Promise.resolve({error:"host_action_in_flight"});}hostActionInFlight=true;updateHostActionState();return Promise.resolve().then(fn).finally(function(){hostActionInFlight=false;updateHostActionState();});}
 function createSession(){return withHostActionLock(function(){return api("/lobby/sessions/create","POST",{});});} 
 function sessionDetail(){if(!code()){updateSessionDetailState();return Promise.resolve({error:"missing_session_code"});}if(sessionDetailInFlight){return Promise.resolve({error:"session_detail_in_flight"});}sessionDetailInFlight=true;updateSessionDetailState();return api("/lobby/sessions/"+code(),"GET",null).finally(function(){sessionDetailInFlight=false;updateSessionDetailState();});} 
 function startRound(){if(document.getElementById("startRoundBtn").disabled){return Promise.resolve({error:"not_enough_players_client_guard"});}return withHostActionLock(function(){return api("/lobby/sessions/"+code()+"/rounds/start","POST",{category_slug:document.getElementById("category").value});});}
-function showQuestion(){return withHostActionLock(function(){return api("/lobby/sessions/"+code()+"/questions/show","POST",{});});} 
-function mixAnswers(){return withHostActionLock(function(){return api("/lobby/sessions/"+code()+"/questions/"+rq()+"/answers/mix","POST",{});});} 
-function calcScores(){return withHostActionLock(function(){return api("/lobby/sessions/"+code()+"/questions/"+rq()+"/scores/calculate","POST",{});});} 
-function showScoreboard(){return withHostActionLock(function(){return api("/lobby/sessions/"+code()+"/scoreboard","GET",null);});} 
 function nextRound(){return withHostActionLock(function(){return api("/lobby/sessions/"+code()+"/rounds/next","POST",{});});} 
 function finishGame(){return withHostActionLock(function(){return api("/lobby/sessions/"+code()+"/finish","POST",{});});} 
-["code","roundQuestionId"].forEach(function(fieldId){var field=document.getElementById(fieldId);if(!field){return;}field.addEventListener("input",function(){syncStartRoundGuard(null);updateHostActionState();updateSessionDetailState();saveHostContext();});field.addEventListener("change",function(){syncStartRoundGuard(null);updateHostActionState();updateSessionDetailState();saveHostContext();});});
+["code"].forEach(function(fieldId){var field=document.getElementById(fieldId);if(!field){return;}field.addEventListener("input",function(){syncStartRoundGuard(null);updateHostActionState();updateSessionDetailState();saveHostContext();});field.addEventListener("change",function(){syncStartRoundGuard(null);updateHostActionState();updateSessionDetailState();saveHostContext();});});

 window.addEventListener("error",function(event){setHostShellFatalError((event&&event.message)||"Ukendt runtime-fejl");});
 window.addEventListener("unhandledrejection",function(event){var reason=event&&event.reason;var detail=(reason&&reason.message)||String(reason||"Unhandled promise rejection");setHostShellFatalError(detail);});
--- a/lobby/templates/lobby/player_screen.html
+++ b/lobby/templates/lobby/player_screen.html
@@ -69,8 +69,12 @@
  <p id="playerCriticalRound">Round question: afventer</p>
  <p id="playerCriticalJoin">Join-status: afventer</p>
 </section>
-<pre id="out">Klar.</pre>
+<pre id="out">Ready.</pre>
+{{ lobby_i18n|json_script:"wppPlayerI18n" }}
 <script>
+var WPP_PLAYER_LOCALE="{{ shell_locale|default:'en'|escapejs }}";
+var WPP_PLAYER_I18N=JSON.parse(document.getElementById("wppPlayerI18n").textContent||"{}");
+function playerCopy(path,fallback){var node=WPP_PLAYER_I18N;var parts=(path||"").split(".");for(var i=0;i<parts.length;i++){if(!node||typeof node!=="object"){return fallback||path;}node=node[parts[i]];}if(node&&typeof node==="object"){if(node[WPP_PLAYER_LOCALE]){return node[WPP_PLAYER_LOCALE];}if(node.en){return node.en;}}return typeof node==="string"?node:(fallback||path);} 
 var availableAnswers=[];
 var guessSubmitted=false;
 var lieSubmitted=false;
@@ -105,7 +109,7 @@ function clearPlayerShellFatalError(){playerShellFatalError=false;playerShellRec
 function recoverPlayerShell(mode){if(playerShellRecoverInFlight){return Promise.resolve({error:"recover_in_flight"});}playerShellRecoverInFlight=true;updatePlayerShellErrorBoundary();if(mode==="reload"){window.location.reload();return Promise.resolve({ok:true});}if(!code()){playerShellRecoverInFlight=false;updatePlayerShellErrorBoundary();return Promise.resolve({error:"missing_session_code"});}return sessionDetail().then(function(result){clearPlayerShellFatalError();return result;}).catch(function(err){playerShellRecoverInFlight=false;updatePlayerShellErrorBoundary();throw err;});}
 function pid(){return document.getElementById("playerId").value.trim();}
 function rq(){return document.getElementById("roundQuestionId").value.trim();}
-function phaseLabel(status){if(status==="lobby"){return"Lobby";}if(status==="lie"){return"Løgn";}if(status==="guess"){return"Gæt";}if(status==="reveal"){return"Reveal";}if(status==="finished"){return"Afsluttet";}return"Ukendt";}
+function phaseLabel(status){if(status==="lobby"){return"Lobby";}if(status==="lie"){return"Lie";}if(status==="guess"){return"Guess";}if(status==="reveal"){return"Reveal";}if(status==="scoreboard"){return"Scoreboard";}if(status==="finished"){return"Finished";}return"Unknown";}
 function updatePhaseStatus(){var el=document.getElementById("phaseStatus");if(!el){return;}if(!currentSessionStatus){el.textContent="Fase: ukendt (opdatér session-status).";return;}el.textContent="Fase: "+phaseLabel(currentSessionStatus)+" ("+currentSessionStatus+")";}
 function savePlayerContext(){try{localStorage.setItem(PLAYER_CONTEXT_KEY,JSON.stringify({code:code(),nickname:document.getElementById("nickname").value.trim(),player_id:pid(),session_token:document.getElementById("sessionToken").value.trim(),round_question_id:rq(),auto_refresh:playerAutoRefreshEnabled}));}catch(_e){}}
 function loadPlayerContext(){try{var raw=localStorage.getItem(PLAYER_CONTEXT_KEY);if(!raw){return null;}return JSON.parse(raw);}catch(_e){return null;}}
@@ -118,8 +122,8 @@ function resetRoundContextForManualChange(){document.getElementById("roundQuesti
 function updateContextLockState(){var locked=isPlayerContextLocked()||joinInFlight;var codeField=document.getElementById("code");var nicknameField=document.getElementById("nickname");var playerIdField=document.getElementById("playerId");var tokenField=document.getElementById("sessionToken");if(codeField){codeField.readOnly=locked;}if(nicknameField){nicknameField.readOnly=locked;}if(playerIdField){playerIdField.readOnly=locked;}if(tokenField){tokenField.readOnly=true;}var hint=document.getElementById("contextLockHint");if(!hint){return;}if(joinInFlight){hint.textContent="Låser kontekst…";return;}if(locked){hint.textContent="Spillerkontekst er låst efter join.";return;}hint.textContent="Kontekst er ikke låst endnu.";}
 function canAttemptJoin(){return !!(code()&&document.getElementById("nickname").value.trim());}
 function normalizeApiError(data){if(!data||typeof data!=="object"){return"";}return (data.error_code||data.error||"").toString();}
-function mapUiErrorMessage(errorKey){if(!errorKey){return"";}var key=errorKey.toLowerCase();if(key.indexOf("phase")!==-1){return"Ugyldig fase for handlingen. Opdatér session-status og prøv igen.";}if(key.indexOf("token")!==-1||key.indexOf("auth")!==-1){return"Session-token er ugyldig eller udløbet. Rejoin sessionen og prøv igen.";}if(key.indexOf("round")!==-1||key.indexOf("question")!==-1||key.indexOf("state")!==-1){return"Runde-kontekst matcher ikke længere. Opdatér session-status før næste handling.";}if(key.indexOf("session")!==-1){return"Sessionkoden er ugyldig eller sessionen findes ikke længere.";}return"Handling fejlede. Opdatér session-status og prøv igen.";}
-function formatTimeLabel(dateObj){return dateObj.toLocaleTimeString("da-DK",{hour12:false});}
+function mapUiErrorMessage(errorKey){if(!errorKey){return"";}var key=errorKey.toLowerCase();if(WPP_PLAYER_I18N&&WPP_PLAYER_I18N.backend&&WPP_PLAYER_I18N.backend.errors&&WPP_PLAYER_I18N.backend.errors[key]){return playerCopy("backend.errors."+key,"Action failed. Refresh state and retry.");}if(key.indexOf("session")!==-1){return playerCopy("backend.errors.session_not_found_or_closed","Session code is invalid, or session no longer exists.");}return playerCopy("backend.errors.generic_action_failed_retry","Action failed. Refresh state and retry.");}
+function formatTimeLabel(dateObj){return dateObj.toLocaleTimeString(WPP_PLAYER_LOCALE,{hour12:false});}
 function markPlayerSessionRefresh(status){if(status>=200&&status<300){playerLastRefreshAtLabel=formatTimeLabel(new Date());playerLastRefreshFailed=false;}else{playerLastRefreshFailed=true;}updatePlayerLastRefreshStatus();}
 function updatePlayerLastRefreshStatus(){var el=document.getElementById("playerLastRefreshStatus");if(!el){return;}if(!playerLastRefreshAtLabel){el.textContent=playerLastRefreshFailed?"Session-data kan være forældet (ingen succesfuld opdatering endnu).":"Session-data ikke opdateret endnu.";return;}if(playerLastRefreshFailed){el.textContent="Session-data kan være forældet (seneste succes: "+playerLastRefreshAtLabel+").";return;}el.textContent="Sidst opdateret: "+playerLastRefreshAtLabel+".";}
 function updatePlayerAutoRefreshUi(){var btn=document.getElementById("playerAutoRefreshToggleBtn");var hint=document.getElementById("playerAutoRefreshHint");if(btn){btn.textContent="Auto-refresh: "+(playerAutoRefreshEnabled?"ON":"OFF");btn.disabled=sessionDetailInFlight||joinInFlight||!code();}if(!hint){return;}if(sessionDetailInFlight){hint.textContent="Auto-refresh-lås: afvent aktiv session-opdatering.";return;}if(joinInFlight){hint.textContent="Auto-refresh-lås: afvent aktiv join.";return;}if(!code()){hint.textContent="Auto-refresh kræver sessionkode.";return;}if(!playerAutoRefreshEnabled){hint.textContent="Auto-refresh er slået fra.";return;}if(currentSessionStatus==="finished"){hint.textContent="Auto-refresh stoppet: spillet er afsluttet.";return;}hint.textContent="Auto-refresh aktiv (10s) for spillerstatus.";}
--- a/lobby/tests.py
+++ b/lobby/tests.py
@@ -19,6 +19,7 @@ from fupogfakta.models import (
    Question,
    RoundConfig,
    RoundQuestion,
+    ScoreEvent,
 )
 from lobby.i18n import i18n_locale_config, lobby_i18n_catalog, resolve_error_message, resolve_locale

@@ -100,6 +101,21 @@ class LobbyFlowTests(TestCase):
        self.assertEqual(response.status_code, 409)
        self.assertEqual(response.json()["error"], "Nickname already taken")

+    def test_player_can_join_during_scoreboard_phase(self):
+        session = GameSession.objects.create(host=self.host, code="ZXCV97", status=GameSession.Status.SCOREBOARD)
+
+        response = self.client.post(
+            reverse("lobby:join_session"),
+            data={"code": "ZXCV97", "nickname": "Kai"},
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 201)
+        body = response.json()
+        self.assertEqual(body["session"]["status"], GameSession.Status.SCOREBOARD)
+        self.assertEqual(body["player"]["nickname"], "Kai")
+        self.assertTrue(Player.objects.filter(session=session, nickname="Kai").exists())
+
    def test_join_rejects_non_joinable_session(self):
        GameSession.objects.create(host=self.host, code="ZXCV98", status=GameSession.Status.FINISHED)

@@ -189,11 +205,14 @@ class StartRoundTests(TestCase):
        self.assertEqual(body["session"]["status"], GameSession.Status.LIE)
        self.assertEqual(body["round"]["number"], 1)
        self.assertEqual(body["round"]["category"]["slug"], self.category.slug)
+        self.assertEqual(body["round_question"]["prompt"], "Hvilket år faldt muren?")
+        self.assertIn("lie_deadline_at", body["round_question"])

        self.session.refresh_from_db()
        self.assertEqual(self.session.status, GameSession.Status.LIE)
        round_config = RoundConfig.objects.get(session=self.session, number=1)
        self.assertEqual(round_config.category, self.category)
+        self.assertTrue(RoundQuestion.objects.filter(session=self.session, round_number=1).exists())

    def test_host_start_round_uses_normalized_session_code_from_path(self):
        self.client.login(username="host", password="secret123")
@@ -289,6 +308,23 @@ class StartRoundTests(TestCase):
        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Only host can start round")

+    @patch("lobby.views._select_round_question", side_effect=ValueError("no_available_questions"))
+    def test_start_round_does_not_persist_round_config_when_question_selection_fails(self, _mock_select_round_question):
+        self.client.login(username="host", password="secret123")
+
+        response = self.client.post(
+            reverse("lobby:start_round", kwargs={"code": self.session.code}),
+            data={"category_slug": self.category.slug},
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error_code"], "no_available_questions")
+        self.session.refresh_from_db()
+        self.assertEqual(self.session.status, GameSession.Status.LOBBY)
+        self.assertFalse(RoundConfig.objects.filter(session=self.session, number=1).exists())
+        self.assertFalse(RoundQuestion.objects.filter(session=self.session, round_number=1).exists())
+

 class LieSubmissionTests(TestCase):
    def setUp(self):
@@ -360,6 +396,8 @@ class LieSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error_code"], "lie_submission_closed")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Lie submission window has closed")

    def test_submit_lie_rejects_duplicate_submission(self):
@@ -381,6 +419,8 @@ class LieSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 409)
+        self.assertEqual(response.json()["error_code"], "lie_already_submitted")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Lie already submitted for this player")

    def test_submit_lie_requires_session_token(self):
@@ -401,6 +441,8 @@ class LieSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error_code"], "session_token_required")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "session_token is required")

    def test_submit_lie_rejects_invalid_session_token(self):
@@ -421,8 +463,33 @@ class LieSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.json()["error_code"], "invalid_player_session_token")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Invalid player session token")

+    def test_submit_lie_uses_danish_locale_payload_from_accept_language(self):
+        round_question = RoundQuestion.objects.create(
+            session=self.session,
+            round_number=1,
+            question=self.question,
+            correct_answer=self.question.correct_answer,
+        )
+
+        response = self.client.post(
+            reverse(
+                "lobby:submit_lie",
+                kwargs={"code": self.session.code, "round_question_id": round_question.id},
+            ),
+            data={"player_id": self.player.id, "session_token": "invalid-token", "text": "Sydney"},
+            content_type="application/json",
+            HTTP_ACCEPT_LANGUAGE="da-DK,da;q=0.9,en;q=0.1",
+        )
+
+        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.json()["error_code"], "invalid_player_session_token")
+        self.assertEqual(response.json()["locale"], "da")
+        self.assertEqual(response.json()["error"], "Ugyldigt spiller-session-token")
+
 class MixAnswersTests(TestCase):
    def setUp(self):
        self.host = User.objects.create_user(username="host", password="secret123")
@@ -582,6 +649,8 @@ class GuessSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error_code"], "guess_submission_invalid_phase")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Guess submission is only allowed in guess phase")

    def test_submit_guess_rejects_unknown_answer(self):
@@ -595,6 +664,8 @@ class GuessSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error_code"], "selected_answer_invalid")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Selected answer is not part of this round")

    def test_submit_guess_rejects_duplicate_submission(self):
@@ -610,6 +681,8 @@ class GuessSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 409)
+        self.assertEqual(response.json()["error_code"], "guess_already_submitted")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Guess already submitted for this player")

    def test_submit_guess_rejects_after_deadline(self):
@@ -626,6 +699,8 @@ class GuessSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error_code"], "guess_submission_closed")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Guess submission window has closed")


@@ -641,6 +716,8 @@ class GuessSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error_code"], "session_token_required")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "session_token is required")

    def test_submit_guess_rejects_invalid_session_token(self):
@@ -654,9 +731,225 @@ class GuessSubmissionTests(TestCase):
        )

        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.json()["error_code"], "invalid_player_session_token")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Invalid player session token")


+class CanonicalRoundFlowTests(TestCase):
+    def setUp(self):
+        self.host = User.objects.create_user(username="host_canonical", password="secret123")
+        self.session = GameSession.objects.create(host=self.host, code="CN2871")
+        self.category = Category.objects.create(name="Kanon", slug="kanon", is_active=True)
+        self.question = Question.objects.create(
+            category=self.category,
+            prompt="Hvem skrev Hamlet?",
+            correct_answer="Shakespeare",
+            is_active=True,
+        )
+        self.players = [
+            Player.objects.create(session=self.session, nickname="Luna"),
+            Player.objects.create(session=self.session, nickname="Mads"),
+            Player.objects.create(session=self.session, nickname="Nora"),
+        ]
+
+    def test_canonical_round_flow_auto_advances_from_start_to_scoreboard(self):
+        self.client.login(username="host_canonical", password="secret123")
+
+        start_response = self.client.post(
+            reverse("lobby:start_round", kwargs={"code": self.session.code}),
+            data={"category_slug": self.category.slug},
+            content_type="application/json",
+        )
+        self.assertEqual(start_response.status_code, 201)
+        round_question_id = start_response.json()["round_question"]["id"]
+        self.assertEqual(start_response.json()["session"]["status"], GameSession.Status.LIE)
+
+        lie_responses = []
+        for index, player in enumerate(self.players, start=1):
+            lie_responses.append(
+                self.client.post(
+                    reverse("lobby:submit_lie", kwargs={"code": self.session.code, "round_question_id": round_question_id}),
+                    data={"player_id": player.id, "session_token": player.session_token, "text": f"Løgn {index}"},
+                    content_type="application/json",
+                )
+            )
+
+        self.assertTrue(all(response.status_code == 201 for response in lie_responses))
+        self.assertEqual(lie_responses[-1].json()["session"]["status"], GameSession.Status.GUESS)
+        self.assertTrue(lie_responses[-1].json()["phase_transition"]["auto_advanced"])
+        self.assertGreaterEqual(len(lie_responses[-1].json()["answers"]), 2)
+
+        guess_targets = ["Shakespeare", "Løgn 1", "Shakespeare"]
+        guess_responses = []
+        for player, selected_text in zip(self.players, guess_targets, strict=True):
+            guess_responses.append(
+                self.client.post(
+                    reverse("lobby:submit_guess", kwargs={"code": self.session.code, "round_question_id": round_question_id}),
+                    data={"player_id": player.id, "session_token": player.session_token, "selected_text": selected_text},
+                    content_type="application/json",
+                )
+            )
+
+        self.assertTrue(all(response.status_code == 201 for response in guess_responses))
+        self.assertEqual(guess_responses[-1].json()["session"]["status"], GameSession.Status.REVEAL)
+        self.assertTrue(guess_responses[-1].json()["phase_transition"]["auto_advanced"])
+        self.assertIsNotNone(guess_responses[-1].json()["reveal"])
+
+        detail_response = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code}))
+        self.assertEqual(detail_response.status_code, 200)
+        payload = detail_response.json()
+        self.assertEqual(payload["session"]["status"], GameSession.Status.SCOREBOARD)
+        self.assertEqual(payload["phase_view_model"]["current_phase"], GameSession.Status.SCOREBOARD)
+        self.assertTrue(payload["phase_view_model"]["readiness"]["scoreboard_ready"])
+        self.assertEqual([entry["nickname"] for entry in payload["scoreboard"]], ["Luna", "Nora", "Mads"])
+        self.assertEqual(payload["reveal"]["correct_answer"], "Shakespeare")
+
+    @patch("lobby.views.sync_broadcast_phase_event")
+    @patch("lobby.views._resolve_scores")
+    def test_session_detail_promotes_zero_score_event_reveal_to_scoreboard(self, mock_resolve_scores, mock_sync_broadcast):
+        self.client.login(username="host_canonical", password="secret123")
+        self.session.status = GameSession.Status.GUESS
+        self.session.save(update_fields=["status"])
+
+        round_config = RoundConfig.objects.create(
+            session=self.session,
+            number=1,
+            category=self.category,
+            points_correct=5,
+            points_bluff=2,
+        )
+        round_question = RoundQuestion.objects.create(
+            session=self.session,
+            round_number=1,
+            question=self.question,
+            correct_answer="Shakespeare",
+        )
+        LieAnswer.objects.create(round_question=round_question, player=self.players[0], text="Marlowe")
+        LieAnswer.objects.create(round_question=round_question, player=self.players[1], text="Chaucer")
+        LieAnswer.objects.create(round_question=round_question, player=self.players[2], text="Austen")
+
+        mock_resolve_scores.return_value = ([], [
+            {"id": player.id, "nickname": player.nickname, "score": player.score}
+            for player in sorted(self.players, key=lambda player: player.nickname)
+        ])
+
+        guess_targets = ["Shakespeare", "Shakespeare", "Shakespeare"]
+        guess_responses = []
+        for player, selected_text in zip(self.players, guess_targets, strict=True):
+            guess_responses.append(
+                self.client.post(
+                    reverse("lobby:submit_guess", kwargs={"code": self.session.code, "round_question_id": round_question.id}),
+                    data={"player_id": player.id, "session_token": player.session_token, "selected_text": selected_text},
+                    content_type="application/json",
+                )
+            )
+
+        self.assertTrue(all(response.status_code == 201 for response in guess_responses))
+        self.assertEqual(guess_responses[-1].json()["session"]["status"], GameSession.Status.REVEAL)
+        self.assertEqual(ScoreEvent.objects.filter(session=self.session, meta__round_question_id=round_question.id).count(), 0)
+
+        detail_response = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code}))
+
+        self.assertEqual(detail_response.status_code, 200)
+        payload = detail_response.json()
+        self.assertEqual(payload["session"]["status"], GameSession.Status.SCOREBOARD)
+        self.assertEqual(payload["phase_view_model"]["current_phase"], GameSession.Status.SCOREBOARD)
+        self.assertTrue(payload["phase_view_model"]["readiness"]["scoreboard_ready"])
+        self.assertEqual(payload["reveal"]["correct_answer"], "Shakespeare")
+        mock_resolve_scores.assert_called_once_with(self.session, round_question, round_config)
+        mock_sync_broadcast.assert_any_call(
+            self.session.code,
+            "phase.scoreboard",
+            {
+                "leaderboard": payload["scoreboard"],
+                "current_round": self.session.current_round,
+            },
+        )
+
+    @patch("lobby.views.sync_broadcast_phase_event")
+    @patch("lobby.views._resolve_scores")
+    @patch("lobby.views.GameSession.objects.get")
+    def test_submit_guess_skips_rescore_when_locked_session_is_already_revealing(
+        self,
+        mock_session_get,
+        mock_resolve_scores,
+        mock_sync_broadcast,
+    ):
+        round_config = RoundConfig.objects.create(
+            session=self.session,
+            number=1,
+            category=self.category,
+            points_correct=5,
+            points_bluff=2,
+        )
+        round_question = RoundQuestion.objects.create(
+            session=self.session,
+            round_number=1,
+            question=self.question,
+            correct_answer="Shakespeare",
+        )
+        LieAnswer.objects.create(round_question=round_question, player=self.players[0], text="Marlowe")
+        Guess.objects.create(
+            round_question=round_question,
+            player=self.players[0],
+            selected_text="Shakespeare",
+            is_correct=True,
+        )
+        Guess.objects.create(
+            round_question=round_question,
+            player=self.players[1],
+            selected_text="Marlowe",
+            is_correct=False,
+            fooled_player=self.players[0],
+        )
+        self.players[0].score = round_config.points_correct + round_config.points_bluff
+        self.players[0].save(update_fields=["score"])
+        ScoreEvent.objects.create(
+            session=self.session,
+            player=self.players[0],
+            delta=round_config.points_correct,
+            reason="guess_correct",
+            meta={"round_question_id": round_question.id, "guess_id": 1},
+        )
+        ScoreEvent.objects.create(
+            session=self.session,
+            player=self.players[0],
+            delta=round_config.points_bluff,
+            reason="bluff_success",
+            meta={"round_question_id": round_question.id, "fooled_count": 1},
+        )
+        self.session.status = GameSession.Status.REVEAL
+        self.session.save(update_fields=["status"])
+
+        stale_session = GameSession(
+            pk=self.session.pk,
+            host=self.host,
+            code=self.session.code,
+            status=GameSession.Status.GUESS,
+            current_round=self.session.current_round,
+        )
+        mock_session_get.return_value = stale_session
+
+        response = self.client.post(
+            reverse("lobby:submit_guess", kwargs={"code": self.session.code, "round_question_id": round_question.id}),
+            data={
+                "player_id": self.players[2].id,
+                "session_token": self.players[2].session_token,
+                "selected_text": "Shakespeare",
+            },
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 201)
+        self.assertEqual(response.json()["session"]["status"], GameSession.Status.REVEAL)
+        self.assertTrue(response.json()["phase_transition"]["auto_advanced"])
+        self.assertIsNotNone(response.json()["reveal"])
+        mock_resolve_scores.assert_not_called()
+        mock_sync_broadcast.assert_not_called()
+        self.assertEqual(ScoreEvent.objects.filter(session=self.session, meta__round_question_id=round_question.id).count(), 2)
+
+
 class ScoreCalculationTests(TestCase):
    def setUp(self):
        self.host = User.objects.create_user(username="host_score", password="secret123")
@@ -687,6 +980,8 @@ class ScoreCalculationTests(TestCase):
        self.player_three = Player.objects.create(session=self.session, nickname="Nora")

    def test_host_can_calculate_scores_and_transition_to_reveal(self):
+        LieAnswer.objects.create(round_question=self.round_question, player=self.player_three, text="Padel")
+
        Guess.objects.create(round_question=self.round_question, player=self.player_one, selected_text="Tennis", is_correct=True)
        Guess.objects.create(
            round_question=self.round_question,
@@ -715,6 +1010,50 @@ class ScoreCalculationTests(TestCase):
        payload = response.json()
        self.assertEqual(payload["session"]["status"], GameSession.Status.REVEAL)
        self.assertEqual(payload["events_created"], 2)
+        self.assertEqual(payload["reveal"]["round_question_id"], self.round_question.id)
+        self.assertEqual(payload["reveal"]["correct_answer"], "Tennis")
+        self.assertEqual(
+            payload["reveal"]["lies"],
+            [
+                {
+                    "player_id": self.player_three.id,
+                    "nickname": "Nora",
+                    "text": "Padel",
+                    "created_at": payload["reveal"]["lies"][0]["created_at"],
+                }
+            ],
+        )
+        self.assertEqual(
+            payload["reveal"]["guesses"],
+            [
+                {
+                    "player_id": self.player_one.id,
+                    "nickname": "Luna",
+                    "selected_text": "Tennis",
+                    "is_correct": True,
+                    "created_at": payload["reveal"]["guesses"][0]["created_at"],
+                    "fooled_player_id": None,
+                },
+                {
+                    "player_id": self.player_two.id,
+                    "nickname": "Mads",
+                    "selected_text": "Padel",
+                    "is_correct": False,
+                    "created_at": payload["reveal"]["guesses"][1]["created_at"],
+                    "fooled_player_id": self.player_three.id,
+                    "fooled_player_nickname": "Nora",
+                },
+                {
+                    "player_id": self.player_three.id,
+                    "nickname": "Nora",
+                    "selected_text": "Padel",
+                    "is_correct": False,
+                    "created_at": payload["reveal"]["guesses"][2]["created_at"],
+                    "fooled_player_id": self.player_three.id,
+                    "fooled_player_nickname": "Nora",
+                },
+            ],
+        )

        self.player_one.refresh_from_db()
        self.player_three.refresh_from_db()
@@ -735,6 +1074,8 @@ class ScoreCalculationTests(TestCase):
        )

        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.json()["error_code"], "host_only_calculate_scores")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Only host can calculate scores")

    def test_calculate_scores_rejects_duplicate_calculation(self):
@@ -756,6 +1097,8 @@ class ScoreCalculationTests(TestCase):

        self.assertEqual(first.status_code, 200)
        self.assertEqual(second.status_code, 409)
+        self.assertEqual(second.json()["error_code"], "scores_already_calculated")
+        self.assertEqual(second.json()["locale"], "en")
        self.assertEqual(second.json()["error"], "Scores already calculated for this round question")


@@ -766,8 +1109,36 @@ class RevealRoundFlowTests(TestCase):
        self.session = GameSession.objects.create(host=self.host, code="RVL123", status=GameSession.Status.REVEAL)
        self.player_one = Player.objects.create(session=self.session, nickname="Luna", score=9)
        self.player_two = Player.objects.create(session=self.session, nickname="Mads", score=3)
+        self.category = Category.objects.create(name="Reveal", slug="reveal", is_active=True)
+        self.question = Question.objects.create(
+            category=self.category,
+            prompt="Hvad er Danmarks hovedstad?",
+            correct_answer="København",
+            is_active=True,
+        )
+        self.next_question = Question.objects.create(
+            category=self.category,
+            prompt="Hvad er Sveriges hovedstad?",
+            correct_answer="Stockholm",
+            is_active=True,
+        )
+        self.round_config = RoundConfig.objects.create(session=self.session, number=1, category=self.category)
+        self.round_question = RoundQuestion.objects.create(
+            session=self.session,
+            round_number=1,
+            question=self.question,
+            correct_answer=self.question.correct_answer,
+        )
+        ScoreEvent.objects.create(
+            session=self.session,
+            player=self.player_one,
+            delta=5,
+            reason="guess_correct",
+            meta={"round_question_id": self.round_question.id},
+        )

-    def test_host_can_get_reveal_scoreboard(self):
+    @patch("lobby.views.sync_broadcast_phase_event")
+    def test_host_can_get_reveal_scoreboard(self, mock_sync_broadcast_phase_event):
        self.client.login(username="host_reveal", password="secret123")

        response = self.client.get(
@@ -779,8 +1150,22 @@ class RevealRoundFlowTests(TestCase):

        self.assertEqual(response.status_code, 200)
        payload = response.json()
-        self.assertEqual(payload["session"]["status"], GameSession.Status.REVEAL)
+        self.assertEqual(payload["session"]["status"], GameSession.Status.SCOREBOARD)
        self.assertEqual([item["nickname"] for item in payload["leaderboard"]], ["Luna", "Mads"])
+        mock_sync_broadcast_phase_event.assert_called_once_with(
+            self.session.code,
+            "phase.scoreboard",
+            {
+                "leaderboard": [
+                    {"id": self.player_one.id, "nickname": "Luna", "score": 9},
+                    {"id": self.player_two.id, "nickname": "Mads", "score": 3},
+                ],
+                "current_round": 1,
+            },
+        )
+
+        self.session.refresh_from_db()
+        self.assertEqual(self.session.status, GameSession.Status.SCOREBOARD)

    def test_reveal_scoreboard_requires_host(self):
        self.client.login(username="other_reveal", password="secret123")
@@ -789,15 +1174,32 @@ class RevealRoundFlowTests(TestCase):
            reverse(
                "lobby:reveal_scoreboard",
                kwargs={"code": self.session.code},
-            )
+            ),
+            HTTP_ACCEPT_LANGUAGE="fr",
        )

        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.json()["error_code"], "host_only_view_scoreboard")
+        self.assertEqual(response.json()["locale"], "en")
        self.assertEqual(response.json()["error"], "Only host can view scoreboard")

-    def test_host_can_finish_game_from_reveal(self):
+    def test_reveal_scoreboard_is_idempotent_in_scoreboard_phase(self):
+        self.session.status = GameSession.Status.SCOREBOARD
+        self.session.save(update_fields=["status"])
        self.client.login(username="host_reveal", password="secret123")

+        response = self.client.get(reverse("lobby:reveal_scoreboard", kwargs={"code": self.session.code}))
+
+        self.assertEqual(response.status_code, 200)
+        payload = response.json()
+        self.assertEqual(payload["session"]["status"], GameSession.Status.SCOREBOARD)
+        self.assertEqual([item["nickname"] for item in payload["leaderboard"]], ["Luna", "Mads"])
+
+    @patch("lobby.views.sync_broadcast_phase_event")
+    def test_host_can_finish_game_from_scoreboard(self, _mock_sync_broadcast_phase_event):
+        self.client.login(username="host_reveal", password="secret123")
+        self.client.get(reverse("lobby:reveal_scoreboard", kwargs={"code": self.session.code}))
+
        response = self.client.post(
            reverse(
                "lobby:finish_game",
@@ -821,11 +1223,14 @@ class RevealRoundFlowTests(TestCase):
            reverse(
                "lobby:finish_game",
                kwargs={"code": self.session.code},
-            )
+            ),
+            HTTP_ACCEPT_LANGUAGE="da",
        )

        self.assertEqual(response.status_code, 403)
-        self.assertEqual(response.json()["error"], "Only host can finish game")
+        self.assertEqual(response.json()["error_code"], "host_only_finish_game")
+        self.assertEqual(response.json()["locale"], "da")
+        self.assertEqual(response.json()["error"], "Kun værten kan afslutte spillet")

    def test_finish_game_rejects_wrong_phase(self):
        self.client.login(username="host_reveal", password="secret123")
@@ -836,14 +1241,20 @@ class RevealRoundFlowTests(TestCase):
            reverse(
                "lobby:finish_game",
                kwargs={"code": self.session.code},
-            )
+            ),
+            HTTP_ACCEPT_LANGUAGE="fr",
        )

        self.assertEqual(response.status_code, 400)
-        self.assertEqual(response.json()["error"], "Game can only be finished from reveal phase")
+        self.assertEqual(response.json()["error_code"], "finish_game_invalid_phase")
+        self.assertEqual(response.json()["locale"], "en")
+        self.assertEqual(response.json()["error"], "Game can only be finished from scoreboard phase")

-    def test_host_can_start_next_round_from_reveal(self):
+    @patch("lobby.views.sync_broadcast_phase_event")
+    def test_host_can_start_next_round_from_scoreboard(self, mock_sync_broadcast_phase_event):
        self.client.login(username="host_reveal", password="secret123")
+        self.client.get(reverse("lobby:reveal_scoreboard", kwargs={"code": self.session.code}))
+        mock_sync_broadcast_phase_event.reset_mock()

        response = self.client.post(
            reverse(
@@ -854,18 +1265,92 @@ class RevealRoundFlowTests(TestCase):

        self.assertEqual(response.status_code, 200)
        payload = response.json()
-        self.assertEqual(payload["session"]["status"], GameSession.Status.LOBBY)
+        self.assertEqual(payload["session"]["status"], GameSession.Status.LIE)
        self.assertEqual(payload["session"]["current_round"], 2)
+        self.assertEqual(payload["round"]["category"]["slug"], self.category.slug)
+        self.assertEqual(payload["round_question"]["prompt"], self.next_question.prompt)
+        self.assertEqual(payload["config"]["lie_seconds"], self.round_config.lie_seconds)

        self.session.refresh_from_db()
-        self.assertEqual(self.session.status, GameSession.Status.LOBBY)
+        self.assertEqual(self.session.status, GameSession.Status.LIE)
        self.assertEqual(self.session.current_round, 2)
+        self.assertTrue(
+            RoundConfig.objects.filter(session=self.session, number=2, category=self.category).exists()
+        )
+        self.assertTrue(
+            RoundQuestion.objects.filter(session=self.session, round_number=2, question=self.next_question).exists()
+        )
+        mock_sync_broadcast_phase_event.assert_called_once()
+        self.assertEqual(mock_sync_broadcast_phase_event.call_args.args[0], self.session.code)
+        self.assertEqual(mock_sync_broadcast_phase_event.call_args.args[1], "phase.lie_started")
+
+    def test_start_next_round_requires_host(self):
+        self.session.status = GameSession.Status.SCOREBOARD
+        self.session.save(update_fields=["status"])
+        self.client.login(username="other_reveal", password="secret123")
+
+        response = self.client.post(
+            reverse(
+                "lobby:start_next_round",
+                kwargs={"code": self.session.code},
+            ),
+            HTTP_ACCEPT_LANGUAGE="fr",
+        )
+
+        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.json(), {
+            "error": "Only host can start next round",
+            "error_code": "host_only_start_next_round",
+            "locale": "en",
+        })
+
+    @patch("lobby.views.sync_broadcast_phase_event")
+    def test_reveal_scoreboard_allows_repeated_reads_after_promotion(self, mock_sync_broadcast_phase_event):
+        self.client.login(username="host_reveal", password="secret123")
+
+        first_response = self.client.get(
+            reverse(
+                "lobby:reveal_scoreboard",
+                kwargs={"code": self.session.code},
+            )
+        )
+        second_response = self.client.get(
+            reverse(
+                "lobby:reveal_scoreboard",
+                kwargs={"code": self.session.code},
+            )
+        )
+
+        self.assertEqual(first_response.status_code, 200)
+        self.assertEqual(second_response.status_code, 200)
+        self.assertEqual(first_response.json()["session"]["status"], GameSession.Status.SCOREBOARD)
+        self.assertEqual(second_response.json()["session"]["status"], GameSession.Status.SCOREBOARD)
+        self.assertEqual([item["nickname"] for item in second_response.json()["leaderboard"]], ["Luna", "Mads"])
+        self.assertEqual(mock_sync_broadcast_phase_event.call_count, 1)

    def test_start_next_round_rejects_wrong_phase(self):
        self.client.login(username="host_reveal", password="secret123")
        self.session.status = GameSession.Status.GUESS
        self.session.save(update_fields=["status"])

+        response = self.client.post(
+            reverse(
+                "lobby:start_next_round",
+                kwargs={"code": self.session.code},
+            ),
+            HTTP_ACCEPT_LANGUAGE="da",
+        )
+
+        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error_code"], "next_round_invalid_phase")
+        self.assertEqual(response.json()["locale"], "da")
+        self.assertEqual(response.json()["error"], "Næste runde kan kun starte fra scoreboard-fasen")
+
+    def test_start_next_round_does_not_persist_round_config_when_question_selection_fails(self):
+        self.client.login(username="host_reveal", password="secret123")
+        self.client.get(reverse("lobby:reveal_scoreboard", kwargs={"code": self.session.code}))
+        self.next_question.delete()
+
        response = self.client.post(
            reverse(
                "lobby:start_next_round",
@@ -874,7 +1359,28 @@ class RevealRoundFlowTests(TestCase):
        )

        self.assertEqual(response.status_code, 400)
-        self.assertEqual(response.json()["error"], "Next round can only start from reveal phase")
+        self.assertEqual(response.json()["error_code"], "no_available_questions")
+        self.session.refresh_from_db()
+        self.assertEqual(self.session.status, GameSession.Status.SCOREBOARD)
+        self.assertEqual(self.session.current_round, 1)
+        self.assertFalse(RoundConfig.objects.filter(session=self.session, number=2).exists())
+        self.assertFalse(RoundQuestion.objects.filter(session=self.session, round_number=2).exists())
+
+    def test_reveal_scoreboard_unsupported_locale_falls_back_to_en_deterministically(self):
+        self.client.login(username="other_reveal", password="secret123")
+
+        response = self.client.get(
+            reverse(
+                "lobby:reveal_scoreboard",
+                kwargs={"code": self.session.code},
+            ),
+            HTTP_ACCEPT_LANGUAGE="fr-FR,fr;q=0.9",
+        )
+
+        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.json()["error_code"], "host_only_view_scoreboard")
+        self.assertEqual(response.json()["locale"], "en")
+        self.assertEqual(response.json()["error"], "Only host can view scoreboard")

 class UiScreenTests(TestCase):
    def setUp(self):
@@ -893,8 +1399,7 @@ class UiScreenTests(TestCase):
        self.assertContains(response, "id=\"createSessionHint\"")
        self.assertContains(response, "saveHostContext")
        self.assertContains(response, "restoreHostContext")
-        self.assertContains(response, "id=\"showQuestionBtn\"")
-        self.assertContains(response, "id=\"mixAnswersBtn\"")
+        self.assertContains(response, "id=\"roundQuestionStatus\"")
        self.assertContains(response, "id=\"hostActionHint\"")
        self.assertContains(response, "id=\"categoryGuardHint\"")

@@ -906,8 +1411,8 @@ class UiScreenTests(TestCase):
        self.assertContains(response, "Kategori er kun redigérbar i lobby-fasen.")
        self.assertContains(response, "Kræver 3-5 spillere i lobbyen.")
        self.assertContains(response, "For mange spillere: maks 5 i MVP før runde-start.")
-        self.assertContains(response, "Round question-id kan kun redigeres i lie/guess/reveal-faser.")
-        self.assertContains(response, "roundQuestionInput.disabled=hostActionInFlight||sessionDetailInFlight||!canEditRoundQuestion")
+        self.assertContains(response, "Round question-id styres server-side i canonical flow og er kun read-only kontekst for host.")
+        self.assertContains(response, "Round question-id styres server-side i canonical flow og er read-only i fase:")
        self.assertContains(response, "categorySelect.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!==\"lobby\"")
        self.assertContains(response, "hostActionInFlight")
        self.assertContains(response, "withHostActionLock")
@@ -936,7 +1441,9 @@ class UiScreenTests(TestCase):
        self.assertContains(response, "markSessionRefresh")
        self.assertContains(response, "updateLastRefreshStatus")
        self.assertContains(response, "isSessionDetailRead")
-        self.assertContains(response, "showQuestionBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!==")
+        self.assertContains(response, "Mid-round faseskift er server-styrede i canonical flow. Host monitorerer kun fremdrift i fase:")
+        self.assertContains(response, "Host-actions er klar: vælg næste runde eller afslut spillet.")
+        self.assertContains(response, 'if(nextRoundBtn){nextRoundBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="scoreboard";}')
        self.assertContains(response, "Host-actions er låst mens session-opdatering kører.")
        self.assertContains(response, "Round question-id er låst mens session-opdatering kører.")
        self.assertContains(response, "Kategori er låst mens session-opdatering kører.")
@@ -1090,6 +1597,28 @@ class UiScreenTests(TestCase):
        self.assertContains(response, "data-wpp-shell-route=\"/host/guess/round-1\"")
        self.assertContains(response, "data-wpp-shell-kind=\"host\"")

+    def test_host_screen_template_registers_scoreboard_shell_route(self):
+        self.client.login(username="host_ui", password="secret123")
+
+        response = self.client.get(reverse("lobby:host_screen"))
+
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(
+            response,
+            'var HOST_SHELL_ROUTES={lobby:"lobby",lie:"lie",guess:"guess",reveal:"reveal",scoreboard:"scoreboard",finished:"finished"};',
+        )
+
+    def test_host_screen_template_gates_next_round_and_finish_on_scoreboard_phase(self):
+        self.client.login(username="host_ui", password="secret123")
+
+        response = self.client.get(reverse("lobby:host_screen"))
+
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, 'if(nextRoundBtn){nextRoundBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="scoreboard";}')
+        self.assertContains(response, 'if(finishGameBtn){finishGameBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="scoreboard";}')
+        self.assertNotContains(response, 'if(nextRoundBtn){nextRoundBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="reveal";}')
+        self.assertNotContains(response, 'if(finishGameBtn){finishGameBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="reveal";}')
+
    @override_settings(USE_SPA_UI=True)
    def test_host_screen_deeplink_normalizes_redundant_slashes_when_feature_flag_enabled(self):
        self.client.login(username="host_ui", password="secret123")
@@ -1149,7 +1678,130 @@ class SessionDetailRoundQuestionTests(TestCase):
        self.assertEqual(payload["round_question"]["id"], round_question.id)
        self.assertEqual(payload["round_question"]["prompt"], self.question.prompt)

+    def test_session_detail_includes_canonical_reveal_payload_in_reveal_phase(self):
+        self.session.status = GameSession.Status.REVEAL
+        self.session.save(update_fields=["status"])
+        round_question = RoundQuestion.objects.create(
+            session=self.session,
+            round_number=1,
+            question=self.question,
+            correct_answer=self.question.correct_answer,
+        )
+        liar = Player.objects.create(session=self.session, nickname="Løgnhals")
+        guesser = Player.objects.create(session=self.session, nickname="Detektiv")
+        correct_player = Player.objects.create(session=self.session, nickname="Sandhed")
+        LieAnswer.objects.create(round_question=round_question, player=liar, text="Tesla")
+        Guess.objects.create(
+            round_question=round_question,
+            player=guesser,
+            selected_text="Tesla",
+            is_correct=False,
+            fooled_player=liar,
+        )
+        Guess.objects.create(
+            round_question=round_question,
+            player=correct_player,
+            selected_text="Edison",
+            is_correct=True,
+        )

+        response = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code}))
+
+        self.assertEqual(response.status_code, 200)
+        payload = response.json()
+        self.assertEqual(payload["reveal"]["round_question_id"], round_question.id)
+        self.assertEqual(payload["reveal"]["correct_answer"], "Edison")
+        self.assertEqual(payload["reveal"]["lies"][0]["player_id"], liar.id)
+        self.assertEqual(payload["reveal"]["lies"][0]["nickname"], "Løgnhals")
+        self.assertEqual(payload["reveal"]["lies"][0]["text"], "Tesla")
+        self.assertEqual(payload["reveal"]["guesses"][0]["player_id"], guesser.id)
+        self.assertEqual(payload["reveal"]["guesses"][0]["selected_text"], "Tesla")
+        self.assertFalse(payload["reveal"]["guesses"][0]["is_correct"])
+        self.assertEqual(payload["reveal"]["guesses"][0]["fooled_player_id"], liar.id)
+        self.assertEqual(payload["reveal"]["guesses"][0]["fooled_player_nickname"], "Løgnhals")
+        self.assertEqual(payload["reveal"]["guesses"][1]["player_id"], correct_player.id)
+        self.assertEqual(payload["reveal"]["guesses"][1]["selected_text"], "Edison")
+        self.assertTrue(payload["reveal"]["guesses"][1]["is_correct"])
+        self.assertIsNone(payload["reveal"]["guesses"][1]["fooled_player_id"])
+        self.assertNotIn("fooled_player_nickname", payload["reveal"]["guesses"][1])
+
+    def test_session_detail_includes_canonical_reveal_payload_in_scoreboard_phase(self):
+        self.session.status = GameSession.Status.SCOREBOARD
+        self.session.save(update_fields=["status"])
+        round_question = RoundQuestion.objects.create(
+            session=self.session,
+            round_number=1,
+            question=self.question,
+            correct_answer=self.question.correct_answer,
+        )
+        liar = Player.objects.create(session=self.session, nickname="Løgnhals")
+        guesser = Player.objects.create(session=self.session, nickname="Detektiv")
+        correct_player = Player.objects.create(session=self.session, nickname="Sandhed")
+        LieAnswer.objects.create(round_question=round_question, player=liar, text="Tesla")
+        Guess.objects.create(
+            round_question=round_question,
+            player=guesser,
+            selected_text="Tesla",
+            is_correct=False,
+            fooled_player=liar,
+        )
+        Guess.objects.create(
+            round_question=round_question,
+            player=correct_player,
+            selected_text="Edison",
+            is_correct=True,
+        )
+
+        response = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code}))
+
+        self.assertEqual(response.status_code, 200)
+        payload = response.json()
+        self.assertEqual(payload["session"]["status"], GameSession.Status.SCOREBOARD)
+        self.assertEqual(payload["reveal"]["round_question_id"], round_question.id)
+        self.assertEqual(payload["reveal"]["correct_answer"], "Edison")
+        self.assertEqual(payload["reveal"]["lies"][0]["player_id"], liar.id)
+        self.assertEqual(payload["reveal"]["lies"][0]["nickname"], "Løgnhals")
+        self.assertEqual(payload["reveal"]["lies"][0]["text"], "Tesla")
+        self.assertEqual(payload["reveal"]["guesses"][0]["player_id"], guesser.id)
+        self.assertEqual(payload["reveal"]["guesses"][0]["selected_text"], "Tesla")
+        self.assertEqual(payload["reveal"]["guesses"][0]["fooled_player_id"], liar.id)
+        self.assertEqual(payload["reveal"]["guesses"][0]["fooled_player_nickname"], "Løgnhals")
+        self.assertTrue(payload["reveal"]["guesses"][1]["is_correct"])
+        self.assertEqual(payload["reveal"]["guesses"][1]["selected_text"], "Edison")
+        self.assertIsNone(payload["reveal"]["guesses"][1]["fooled_player_id"])
+        self.assertIsNone(payload["reveal"]["guesses"][1].get("fooled_player_nickname"))
+
+    def test_session_detail_preserves_canonical_reveal_payload_across_reveal_and_scoreboard(self):
+        round_question = RoundQuestion.objects.create(
+            session=self.session,
+            round_number=1,
+            question=self.question,
+            correct_answer=self.question.correct_answer,
+        )
+        liar = Player.objects.create(session=self.session, nickname="Løgnhals")
+        guesser = Player.objects.create(session=self.session, nickname="Detektiv")
+        LieAnswer.objects.create(round_question=round_question, player=liar, text="Tesla")
+        Guess.objects.create(
+            round_question=round_question,
+            player=guesser,
+            selected_text="Tesla",
+            is_correct=False,
+            fooled_player=liar,
+        )
+
+        self.session.status = GameSession.Status.REVEAL
+        self.session.save(update_fields=["status"])
+        reveal_payload = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code})).json()
+
+        self.session.status = GameSession.Status.SCOREBOARD
+        self.session.save(update_fields=["status"])
+        scoreboard_payload = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code})).json()
+
+        self.assertEqual(reveal_payload["reveal"], scoreboard_payload["reveal"])
+        self.assertTrue(reveal_payload["phase_view_model"]["readiness"]["scoreboard_ready"])
+        self.assertTrue(scoreboard_payload["phase_view_model"]["readiness"]["scoreboard_ready"])
+        self.assertFalse(reveal_payload["phase_view_model"]["host"]["can_start_next_round"])
+        self.assertTrue(scoreboard_payload["phase_view_model"]["host"]["can_start_next_round"])


 class SessionDetailPhaseViewModelTests(TestCase):
@@ -1174,7 +1826,10 @@ class SessionDetailPhaseViewModelTests(TestCase):
        self.assertTrue(phase["constraints"]["min_players_reached"])
        self.assertTrue(phase["constraints"]["max_players_allowed"])
        self.assertTrue(phase["host"]["can_start_round"])
+        self.assertEqual(phase["current_phase"], GameSession.Status.LOBBY)
        self.assertFalse(phase["host"]["can_show_question"])
+        self.assertFalse(phase["readiness"]["question_ready"])
+        self.assertFalse(phase["readiness"]["scoreboard_ready"])
        self.assertTrue(phase["player"]["can_join"])
        self.assertFalse(phase["player"]["can_submit_lie"])
        self.assertFalse(phase["player"]["can_submit_guess"])
@@ -1199,7 +1854,8 @@ class SessionDetailPhaseViewModelTests(TestCase):
        lie_payload = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code})).json()
        lie_phase = lie_payload["phase_view_model"]
        self.assertFalse(lie_phase["host"]["can_show_question"])
-        self.assertTrue(lie_phase["host"]["can_mix_answers"])
+        self.assertFalse(lie_phase["host"]["can_mix_answers"])
+        self.assertTrue(lie_phase["readiness"]["question_ready"])
        self.assertTrue(lie_phase["player"]["can_submit_lie"])
        self.assertFalse(lie_phase["player"]["can_submit_guess"])

@@ -1207,8 +1863,9 @@ class SessionDetailPhaseViewModelTests(TestCase):
        self.session.save(update_fields=["status"])
        guess_payload = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code})).json()
        guess_phase = guess_payload["phase_view_model"]
-        self.assertTrue(guess_phase["host"]["can_mix_answers"])
-        self.assertTrue(guess_phase["host"]["can_calculate_scores"])
+        self.assertFalse(guess_phase["host"]["can_mix_answers"])
+        self.assertFalse(guess_phase["host"]["can_calculate_scores"])
+        self.assertFalse(guess_phase["readiness"]["scoreboard_ready"])
        self.assertFalse(guess_phase["player"]["can_submit_lie"])
        self.assertTrue(guess_phase["player"]["can_submit_guess"])

@@ -1217,11 +1874,22 @@ class SessionDetailPhaseViewModelTests(TestCase):
        self.session.save(update_fields=["status"])
        reveal_payload = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code})).json()
        reveal_phase = reveal_payload["phase_view_model"]
-        self.assertTrue(reveal_phase["host"]["can_reveal_scoreboard"])
-        self.assertTrue(reveal_phase["host"]["can_start_next_round"])
-        self.assertTrue(reveal_phase["host"]["can_finish_game"])
+        self.assertFalse(reveal_phase["host"]["can_reveal_scoreboard"])
+        self.assertTrue(reveal_phase["readiness"]["scoreboard_ready"])
+        self.assertFalse(reveal_phase["host"]["can_start_next_round"])
+        self.assertFalse(reveal_phase["host"]["can_finish_game"])
        self.assertFalse(reveal_phase["player"]["can_view_final_result"])

+        self.session.status = GameSession.Status.SCOREBOARD
+        self.session.save(update_fields=["status"])
+        scoreboard_payload = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code})).json()
+        scoreboard_phase = scoreboard_payload["phase_view_model"]
+        self.assertFalse(scoreboard_phase["host"]["can_reveal_scoreboard"])
+        self.assertTrue(scoreboard_phase["readiness"]["scoreboard_ready"])
+        self.assertTrue(scoreboard_phase["host"]["can_start_next_round"])
+        self.assertTrue(scoreboard_phase["host"]["can_finish_game"])
+        self.assertFalse(scoreboard_phase["player"]["can_view_final_result"])
+
        self.session.status = GameSession.Status.FINISHED
        self.session.save(update_fields=["status"])
        finished_payload = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code})).json()
@@ -1255,12 +1923,10 @@ class SmokeStagingCommandTests(TestCase):
                    "create_session",
                    "join_players",
                    "start_round",
-                    "show_question",
                    "submit_lies",
-                    "mix_answers",
+                    "auto_guess_transition",
                    "submit_guesses",
-                    "calculate_scores",
-                    "reveal_scoreboard",
+                    "auto_reveal_to_scoreboard",
                    "finish_game",
                ],
            )
@@ -1342,6 +2008,15 @@ class I18nResolverTests(TestCase):
        self.assertEqual(result, "missing_key")
        self.assertTrue(any("i18n key missing in shared catalog" in entry for entry in logs.output))

+    def test_missing_backend_error_code_is_logged_with_context(self):
+        from lobby.i18n import resolve_error_key
+
+        with self.assertLogs("lobby.i18n", level="WARNING") as logs:
+            result = resolve_error_key("missing_code")
+
+        self.assertEqual(result, "missing_code")
+        self.assertTrue(any("i18n error code missing in shared catalog" in entry for entry in logs.output))
+
    def test_missing_locale_translation_falls_back_to_default_locale(self):
        with patch(
            "lobby.i18n.lobby_i18n_error_messages",
--- a/lobby/ui_views.py
+++ b/lobby/ui_views.py
@@ -40,6 +40,7 @@ def host_screen(request, spa_path=None):
        {
            "categories": categories,
            "lobby_i18n": lobby_i18n_catalog(),
+            "shell_locale": resolve_locale(request),
        },
    )

@@ -48,4 +49,8 @@ def player_screen(request):
    if use_spa_ui():
        return _render_spa_shell(request, "/player", "player")

-    return render(request, "lobby/player_screen.html", {"lobby_i18n": lobby_i18n_catalog()})
+    return render(
+        request,
+        "lobby/player_screen.html",
+        {"lobby_i18n": lobby_i18n_catalog(), "shell_locale": resolve_locale(request)},
+    )
--- a/lobby/views.py
+++ b/lobby/views.py
--- a/partyhub/asgi.py
+++ b/partyhub/asgi.py
@@ -1,11 +1,15 @@
 import os
-from channels.routing import ProtocolTypeRouter
+
+from channels.routing import ProtocolTypeRouter, URLRouter
 from django.core.asgi import get_asgi_application

 os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'partyhub.settings')

 django_asgi_app = get_asgi_application()

+from realtime.routing import websocket_urlpatterns  # noqa: E402 — must come after env setup
+
 application = ProtocolTypeRouter({
    'http': django_asgi_app,
+    'websocket': URLRouter(websocket_urlpatterns),
 })
--- a/partyhub/settings.py
+++ b/partyhub/settings.py
@@ -116,8 +116,13 @@ WPP_SPA_ASSET_VERSION = env('WPP_SPA_ASSET_VERSION', 'dev')

 CHANNEL_REDIS_HOST = env('CHANNEL_REDIS_HOST', '127.0.0.1')
 CHANNEL_REDIS_PORT = int(env('CHANNEL_REDIS_PORT', '6379'))
+
+import sys  # noqa: E402
+_testing = 'test' in sys.argv
 CHANNEL_LAYERS = {
    'default': {
+        'BACKEND': 'channels.layers.InMemoryChannelLayer',
+    } if _testing else {
        'BACKEND': 'channels_redis.core.RedisChannelLayer',
        'CONFIG': {'hosts': [(CHANNEL_REDIS_HOST, CHANNEL_REDIS_PORT)]},
    }
--- a/realtime/broadcast.py
+++ b/realtime/broadcast.py
@@ -0,0 +1,35 @@
+from asgiref.sync import async_to_sync
+from channels.exceptions import InvalidChannelLayerError
+from channels.layers import get_channel_layer
+
+try:
+    from redis.exceptions import ConnectionError as RedisConnectionError
+except Exception:  # pragma: no cover - optional dependency in local/test runtimes
+    RedisConnectionError = RuntimeError
+
+
+async def broadcast_phase_event(session_code: str, event_type: str, payload: dict) -> None:
+    """Send a phase event to all WebSocket clients connected to a game session."""
+    try:
+        channel_layer = get_channel_layer()
+        if channel_layer is None:
+            return
+        group_name = f"game_{session_code.upper()}"
+        await channel_layer.group_send(
+            group_name,
+            {
+                "type": "phase.event",
+                "event_type": event_type,
+                "payload": payload,
+            },
+        )
+    except (InvalidChannelLayerError, RedisConnectionError):
+        return
+
+
+def sync_broadcast_phase_event(session_code: str, event_type: str, payload: dict) -> None:
+    """Sync wrapper for calling broadcast_phase_event from synchronous Django views."""
+    try:
+        async_to_sync(broadcast_phase_event)(session_code, event_type, payload)
+    except (InvalidChannelLayerError, RedisConnectionError):
+        return
--- a/realtime/consumers.py
+++ b/realtime/consumers.py
@@ -0,0 +1,63 @@
+import json
+from urllib.parse import parse_qs
+
+from channels.generic.websocket import AsyncJsonWebsocketConsumer
+
+from fupogfakta.models import Player
+
+
+class GameConsumer(AsyncJsonWebsocketConsumer):
+    """
+    WebSocket consumer for a game session.
+
+    URL: ws/game/<session_code>/
+
+    Query params:
+      - session_token: player session token (players only)
+      - role=host: skip token check for host in MVP
+    """
+
+    async def connect(self):
+        self.session_code = self.scope["url_route"]["kwargs"]["session_code"].upper()
+        self.group_name = f"game_{self.session_code}"
+
+        query_string = self.scope.get("query_string", b"").decode()
+        params = parse_qs(query_string)
+
+        role = params.get("role", [None])[0]
+        session_token = params.get("session_token", [None])[0]
+
+        if role != "host":
+            if not session_token:
+                await self.close(code=4001)
+                return
+
+            try:
+                self.player = await Player.objects.aget(
+                    session_token=session_token,
+                    session__code=self.session_code,
+                )
+            except Player.DoesNotExist:
+                await self.close(code=4003)
+                return
+        else:
+            self.player = None
+
+        await self.channel_layer.group_add(self.group_name, self.channel_name)
+        await self.accept()
+
+    async def disconnect(self, close_code):
+        if hasattr(self, "group_name"):
+            await self.channel_layer.group_discard(self.group_name, self.channel_name)
+
+    async def receive_json(self, content, **kwargs):
+        if content.get("type") == "ping":
+            await self.send_json({"type": "pong"})
+
+    # --- Group message handlers ---
+
+    async def phase_event(self, event):
+        """Forward any phase_event broadcast to the WebSocket client."""
+        payload = dict(event.get("payload") or {})
+        payload["type"] = event["event_type"]
+        await self.send_json(payload)
--- a/realtime/routing.py
+++ b/realtime/routing.py
@@ -0,0 +1,7 @@
+from django.urls import re_path
+
+from . import consumers
+
+websocket_urlpatterns = [
+    re_path(r"^ws/game/(?P<session_code>[A-Z0-9]{4,8})/$", consumers.GameConsumer.as_asgi()),
+]
--- a/realtime/tests.py
+++ b/realtime/tests.py
@@ -1,3 +1,123 @@
-from django.test import TestCase
+import unittest
+from unittest.mock import AsyncMock, Mock, patch

-# Create your tests here.
+from channels.exceptions import InvalidChannelLayerError
+from django.contrib.auth import get_user_model
+from django.test import SimpleTestCase, TestCase
+
+try:
+    from channels.testing import WebsocketCommunicator
+except Exception:  # pragma: no cover - optional test dependency
+    WebsocketCommunicator = None
+
+from fupogfakta.models import GameSession, Player
+from partyhub.asgi import application
+from realtime.broadcast import broadcast_phase_event, sync_broadcast_phase_event
+from realtime.consumers import GameConsumer
+
+User = get_user_model()
+
+
+class BroadcastPhaseEventTests(SimpleTestCase):
+    @patch("realtime.broadcast.get_channel_layer", return_value=None)
+    async def test_broadcast_phase_event_noops_without_channel_layer(self, _mock_get_channel_layer):
+        await broadcast_phase_event("ABCD", "phase.scoreboard", {"phase": "scoreboard"})
+
+    @patch("realtime.broadcast.async_to_sync")
+    def test_sync_broadcast_phase_event_noops_when_channel_layer_is_unavailable(self, mock_async_to_sync):
+        mock_async_to_sync.return_value.side_effect = InvalidChannelLayerError("missing channel layer")
+
+        sync_broadcast_phase_event("ABCD", "phase.scoreboard", {"phase": "scoreboard"})
+
+    @patch("realtime.broadcast.async_to_sync")
+    def test_sync_broadcast_phase_event_still_broadcasts_when_channel_layer_exists(self, mock_async_to_sync):
+        sender = Mock()
+        mock_async_to_sync.return_value = sender
+
+        sync_broadcast_phase_event("ABCD", "phase.scoreboard", {"phase": "scoreboard"})
+
+        sender.assert_called_once_with("ABCD", "phase.scoreboard", {"phase": "scoreboard"})
+
+
+class GameConsumerPhaseEventTests(SimpleTestCase):
+    async def test_phase_event_restores_external_type_field(self):
+        consumer = GameConsumer()
+        consumer.send_json = AsyncMock()
+
+        await consumer.phase_event(
+            {
+                "event_type": "phase.test_event",
+                "payload": {"hello": "world"},
+            }
+        )
+
+        consumer.send_json.assert_awaited_once_with(
+            {
+                "type": "phase.test_event",
+                "hello": "world",
+            }
+        )
+
+
+@unittest.skipIf(WebsocketCommunicator is None, "channels.testing dependencies unavailable")
+class GameConsumerConnectTest(TestCase):
+    def setUp(self):
+        self.user = User.objects.create_user(username="host", password="pw")
+        self.session = GameSession.objects.create(host=self.user, code="AABBCC")
+        self.player = Player.objects.create(session=self.session, nickname="Tester")
+
+    async def test_player_connect_and_ping(self):
+        token = self.player.session_token
+        communicator = WebsocketCommunicator(
+            application,
+            f"/ws/game/AABBCC/?session_token={token}",
+        )
+        connected, _ = await communicator.connect()
+        self.assertTrue(connected)
+
+        await communicator.send_json_to({"type": "ping"})
+        response = await communicator.receive_json_from()
+        self.assertEqual(response["type"], "pong")
+
+        await communicator.disconnect()
+
+    async def test_connect_without_token_rejected(self):
+        communicator = WebsocketCommunicator(application, "/ws/game/AABBCC/")
+        connected, code = await communicator.connect()
+        self.assertFalse(connected)
+        self.assertEqual(code, 4001)
+
+    async def test_connect_invalid_token_rejected(self):
+        communicator = WebsocketCommunicator(
+            application,
+            "/ws/game/AABBCC/?session_token=invalid-token",
+        )
+        connected, code = await communicator.connect()
+        self.assertFalse(connected)
+        self.assertEqual(code, 4003)
+
+    async def test_host_connect_without_token(self):
+        communicator = WebsocketCommunicator(
+            application,
+            "/ws/game/AABBCC/?role=host",
+        )
+        connected, _ = await communicator.connect()
+        self.assertTrue(connected)
+        await communicator.disconnect()
+
+    async def test_broadcast_reaches_connected_client(self):
+        token = self.player.session_token
+        communicator = WebsocketCommunicator(
+            application,
+            f"/ws/game/AABBCC/?session_token={token}",
+        )
+        connected, _ = await communicator.connect()
+        self.assertTrue(connected)
+
+        await broadcast_phase_event("AABBCC", "phase.test_event", {"hello": "world"})
+
+        message = await communicator.receive_json_from(timeout=2)
+        self.assertEqual(message["type"], "phase.test_event")
+        self.assertEqual(message["hello"], "world")
+
+        await communicator.disconnect()
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
 Django==6.0.2
 channels>=4.1,<5
 channels-redis>=4.2,<5
+daphne>=4.1,<5
 mysqlclient>=2.2,<3
 python-dotenv>=1.0,<2
--- a/scripts/build_i18n_parity_report.py
+++ b/scripts/build_i18n_parity_report.py
@@ -0,0 +1,214 @@
+#!/usr/bin/env python3
+"""Build the shared i18n parity artifact for MVP-critical Django/Angular keys."""
+
+from __future__ import annotations
+
+import argparse
+import hashlib
+import json
+import re
+from collections import defaultdict
+from pathlib import Path
+from typing import Any
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+CATALOG_PATH = REPO_ROOT / "shared" / "i18n" / "lobby.json"
+ARTIFACT_PATH = REPO_ROOT / "shared" / "i18n" / "artifacts" / "lobby-mvp-keyspace-parity-report.v1.json"
+DJANGO_VIEWS_PATH = REPO_ROOT / "lobby" / "views.py"
+FRONTEND_VERTICAL_SLICE_PATH = REPO_ROOT / "frontend" / "src" / "spa" / "vertical-slice.ts"
+ANGULAR_I18N_PATH = REPO_ROOT / "frontend" / "angular" / "src" / "app" / "lobby-i18n.ts"
+ANGULAR_HOST_PATH = REPO_ROOT / "frontend" / "angular" / "src" / "app" / "features" / "host" / "host-shell.component.ts"
+ANGULAR_PLAYER_PATH = REPO_ROOT / "frontend" / "angular" / "src" / "app" / "features" / "player" / "player-shell.component.ts"
+
+ARTIFACT_NAME = "shared.i18n.lobby.mvp_keyspace_parity_report"
+ARTIFACT_VERSION = "v1"
+
+
+class ParityError(RuntimeError):
+    pass
+
+
+def _read_text(path: Path) -> str:
+    return path.read_text(encoding="utf-8")
+
+
+def _load_catalog() -> dict[str, Any]:
+    return json.loads(_read_text(CATALOG_PATH))
+
+
+def _catalog_hash() -> str:
+    return hashlib.sha256(CATALOG_PATH.read_bytes()).hexdigest()
+
+
+def _sorted_unique(values: list[str]) -> list[str]:
+    return sorted({value for value in values})
+
+
+def _extract_matches(path: Path, pattern: str) -> list[str]:
+    return re.findall(pattern, _read_text(path), re.MULTILINE)
+
+
+def _resolve_frontend_ui_key(key: str) -> str:
+    if key.startswith("lobby.shell."):
+        return key.replace("lobby.shell.", "app.", 1)
+    if key.startswith("game.host."):
+        return key.replace("game.host.", "host.", 1)
+    if key.startswith("game.player."):
+        return key.replace("game.player.", "player.", 1)
+    return key
+
+
+def _has_nested_key(root: dict[str, Any], dotted_key: str) -> bool:
+    current: Any = root
+    for part in dotted_key.split("."):
+        if not isinstance(current, dict) or part not in current:
+            return False
+        current = current[part]
+    return isinstance(current, dict)
+
+
+def build_report() -> dict[str, Any]:
+    catalog = _load_catalog()
+    locales = list(catalog["locales"]["supported"])
+    frontend_errors: dict[str, Any] = catalog["frontend"]["errors"]
+    frontend_ui: dict[str, Any] = catalog["frontend"]["ui"]
+    backend_error_codes: dict[str, str] = catalog["backend"]["error_codes"]
+    backend_errors: dict[str, Any] = catalog["backend"]["errors"]
+    backend_to_frontend: dict[str, str] = catalog["contract"]["backend_to_frontend_error_keys"]
+
+    django_error_codes = _sorted_unique(
+        _extract_matches(DJANGO_VIEWS_PATH, r'ERROR_CODES\.get\("([a-z0-9_]+)"')
+    )
+    frontend_runtime_error_fallbacks = _sorted_unique(
+        _extract_matches(FRONTEND_VERTICAL_SLICE_PATH, r"lobbyMessageFromApiPayload\([^\n]+?'([a-z0-9_]+)'\)")
+        + _extract_matches(FRONTEND_VERTICAL_SLICE_PATH, r"lobbyMessage\('([a-z0-9_]+)'\)")
+    )
+    angular_copy_keys = _sorted_unique(
+        _extract_matches(ANGULAR_HOST_PATH, r"copy\('([A-Za-z0-9_\.]+)'\)")
+        + _extract_matches(ANGULAR_PLAYER_PATH, r"copy\('([A-Za-z0-9_\.]+)'\)")
+    )
+    angular_catalog_paths = [_resolve_frontend_ui_key(key) for key in angular_copy_keys]
+
+    missing_backend_codes = [code for code in django_error_codes if code not in backend_error_codes]
+    missing_backend_translations = [code for code in django_error_codes if code not in backend_errors]
+    missing_contract_mappings = [code for code in django_error_codes if code not in backend_to_frontend]
+    mapped_frontend_error_keys = _sorted_unique(
+        [backend_to_frontend[code] for code in django_error_codes if code in backend_to_frontend]
+    )
+    missing_frontend_error_keys = [key for key in mapped_frontend_error_keys if key not in frontend_errors]
+    missing_frontend_runtime_fallbacks = [key for key in frontend_runtime_error_fallbacks if key not in frontend_errors]
+    missing_angular_catalog_paths = [path for path in angular_catalog_paths if not _has_nested_key(frontend_ui, path)]
+
+    dead_contract_aliases = _sorted_unique([code for code in backend_to_frontend if code not in backend_error_codes])
+    many_to_one_mappings: dict[str, list[str]] = defaultdict(list)
+    for code in django_error_codes:
+        frontend_key = backend_to_frontend.get(code)
+        if frontend_key:
+            many_to_one_mappings[frontend_key].append(code)
+    many_to_one_mappings = {
+        frontend_key: sorted(codes)
+        for frontend_key, codes in sorted(many_to_one_mappings.items())
+        if len(codes) > 1
+    }
+
+    blocking_issues = {
+        "missing_backend_codes": missing_backend_codes,
+        "missing_backend_translations": missing_backend_translations,
+        "missing_contract_mappings": missing_contract_mappings,
+        "missing_frontend_error_keys": missing_frontend_error_keys,
+        "missing_frontend_runtime_fallbacks": missing_frontend_runtime_fallbacks,
+        "missing_angular_catalog_paths": missing_angular_catalog_paths,
+    }
+    status = "pass" if not any(blocking_issues.values()) else "fail"
+
+    follow_ups: list[dict[str, str]] = []
+    if dead_contract_aliases:
+        follow_ups.append(
+            {
+                "priority": "need-to-have",
+                "item": "Either add missing backend/error_codes + backend/errors entries for dead contract aliases or remove them from contract.backend_to_frontend_error_keys.",
+                "evidence": ", ".join(dead_contract_aliases),
+            }
+        )
+    if many_to_one_mappings:
+        follow_ups.append(
+            {
+                "priority": "nice-to-have",
+                "item": "Decide whether grouped backend codes should keep collapsing into one Angular fallback key or be split into more specific frontend error copy as UX matures.",
+                "evidence": "; ".join(
+                    f"{frontend_key} <= {', '.join(codes)}" for frontend_key, codes in many_to_one_mappings.items()
+                ),
+            }
+        )
+
+    return {
+        "artifact_name": ARTIFACT_NAME,
+        "artifact_version": ARTIFACT_VERSION,
+        "naming_version_rule": "Keep a stable artifact_name and append only explicit schema-major suffixes to the filename/version (v1, v2, ...). Update artifact_version only when the report shape changes; refresh content in-place for catalog/keyspace changes.",
+        "source_of_truth": {
+            "catalog": str(CATALOG_PATH.relative_to(REPO_ROOT)),
+            "catalog_sha256": _catalog_hash(),
+            "source_paths": [
+                str(path.relative_to(REPO_ROOT))
+                for path in [
+                    DJANGO_VIEWS_PATH,
+                    FRONTEND_VERTICAL_SLICE_PATH,
+                    ANGULAR_I18N_PATH,
+                    ANGULAR_HOST_PATH,
+                    ANGULAR_PLAYER_PATH,
+                ]
+            ],
+        },
+        "scope": {
+            "issue": 277,
+            "related_epic": 175,
+            "mvp_locales": locales,
+            "definition": "MVP-critical keys are the Django error codes emitted by lobby/views.py plus the Angular fallback/UI keys consumed by the host/player MVP shells.",
+        },
+        "parity": {
+            "status": status,
+            "django_backend_error_codes_used_by_mvp": django_error_codes,
+            "angular_frontend_error_fallback_keys_used_by_mvp": frontend_runtime_error_fallbacks,
+            "angular_ui_keys_used_by_mvp": angular_copy_keys,
+            "angular_ui_catalog_paths": angular_catalog_paths,
+            "backend_codes_mapped_to_frontend_error_keys": {code: backend_to_frontend[code] for code in django_error_codes if code in backend_to_frontend},
+            "unique_frontend_error_keys_reached_from_django": mapped_frontend_error_keys,
+            "blocking_issues": blocking_issues,
+            "follow_ups": follow_ups,
+        },
+    }
+
+
+def write_report() -> None:
+    report = build_report()
+    ARTIFACT_PATH.parent.mkdir(parents=True, exist_ok=True)
+    ARTIFACT_PATH.write_text(json.dumps(report, indent=2, ensure_ascii=False) + "\n", encoding="utf-8")
+
+
+def check_report() -> None:
+    report = build_report()
+    if not ARTIFACT_PATH.exists():
+        raise ParityError(f"artifact missing: {ARTIFACT_PATH}")
+    existing = json.loads(_read_text(ARTIFACT_PATH))
+    if existing != report:
+        raise ParityError("artifact out of date; run scripts/build_i18n_parity_report.py --write")
+    if report["parity"]["status"] != "pass":
+        raise ParityError(json.dumps(report["parity"]["blocking_issues"], indent=2))
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--write", action="store_true")
+    parser.add_argument("--check", action="store_true")
+    args = parser.parse_args()
+    if args.write:
+        write_report()
+    if args.check:
+        check_report()
+    if not args.write and not args.check:
+        print(json.dumps(build_report(), indent=2, ensure_ascii=False))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
--- a/scripts/check_i18n_parity_artifact.py
+++ b/scripts/check_i18n_parity_artifact.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+"""Guard issue #277 parity artifact against non-deterministic regeneration."""
+
+from __future__ import annotations
+
+import hashlib
+import subprocess
+import sys
+from pathlib import Path
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+ARTIFACT_PATH = REPO_ROOT / "docs" / "ISSUE-277-SHARED-I18N-PARITY-ARTIFACT.md"
+REPORT_SCRIPT = REPO_ROOT / "scripts" / "report_i18n_parity.py"
+
+
+def sha256(path: Path) -> str:
+    return hashlib.sha256(path.read_bytes()).hexdigest()
+
+
+def main() -> int:
+    before = sha256(ARTIFACT_PATH)
+
+    for run in range(1, 3):
+        subprocess.run([sys.executable, str(REPORT_SCRIPT)], cwd=REPO_ROOT, check=True)
+        after = sha256(ARTIFACT_PATH)
+        if after != before:
+            raise SystemExit(
+                f"issue #277 parity artifact is not deterministic after run {run}: {before} != {after}"
+            )
+
+    print(f"issue #277 parity artifact deterministic: {before}")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
--- a/scripts/report_i18n_parity.py
+++ b/scripts/report_i18n_parity.py
@@ -0,0 +1,196 @@
+#!/usr/bin/env python3
+"""Generate issue #277 shared i18n parity artifact.
+
+Read-only report over the shared lobby i18n catalog, with focus on MVP-critical
+backend/frontend parity used by Django and Angular.
+"""
+
+from __future__ import annotations
+
+import json
+from dataclasses import dataclass
+from pathlib import Path
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+CATALOG_PATH = REPO_ROOT / "shared" / "i18n" / "lobby.json"
+OUTPUT_PATH = REPO_ROOT / "docs" / "ISSUE-277-SHARED-I18N-PARITY-ARTIFACT.md"
+ARTIFACT_ID = "issue-277-shared-i18n-parity-report"
+ARTIFACT_VERSION = "1.0"
+
+MVP_FRONTEND_UI_KEYS = [
+    "frontend.ui.host.title",
+    "frontend.ui.player.title",
+    "frontend.ui.common.session_code",
+    "frontend.ui.player.nickname",
+    "frontend.ui.player.join",
+    "frontend.ui.host.start_round",
+    "frontend.ui.host.show_question",
+    "frontend.ui.player.lie_label",
+    "frontend.ui.player.submit_lie",
+    "frontend.ui.player.submit_guess",
+    "frontend.ui.host.mix_answers",
+    "frontend.ui.host.calculate_scores",
+    "frontend.ui.host.load_scoreboard",
+    "frontend.ui.host.final_leaderboard",
+    "frontend.ui.player.final_leaderboard",
+    "frontend.ui.common.points_short",
+]
+
+MVP_FRONTEND_ERROR_KEYS = [
+    "frontend.errors.session_code_required",
+    "frontend.errors.session_not_found",
+    "frontend.errors.nickname_invalid",
+    "frontend.errors.nickname_taken",
+    "frontend.errors.join_failed",
+    "frontend.errors.start_round_failed",
+    "frontend.errors.unknown",
+]
+
+MVP_BACKEND_CODES = [
+    "backend.error_codes.session_code_required",
+    "backend.error_codes.nickname_invalid",
+    "backend.error_codes.session_not_found",
+    "backend.error_codes.session_not_joinable",
+    "backend.error_codes.nickname_taken",
+    "backend.error_codes.category_slug_required",
+    "backend.error_codes.category_not_found",
+    "backend.error_codes.round_start_invalid_phase",
+    "backend.error_codes.round_already_configured",
+]
+
+
+@dataclass(frozen=True)
+class MappingRow:
+    backend_code: str
+    backend_key: str
+    frontend_key: str
+    locales_ok: bool
+    parity_status: str
+    note: str
+
+
+def load_catalog() -> dict:
+    return json.loads(CATALOG_PATH.read_text(encoding="utf-8"))
+
+
+def get_path(data: dict, dotted: str):
+    node = data
+    for part in dotted.split("."):
+        node = node[part]
+    return node
+
+
+def translation_state(data: dict, dotted: str) -> tuple[bool, list[str]]:
+    translations = get_path(data, dotted)
+    missing = [locale for locale in ("en", "da") if not isinstance(translations.get(locale), str) or not translations[locale].strip()]
+    return (not missing, missing)
+
+
+def build_mapping_rows(catalog: dict) -> list[MappingRow]:
+    rows: list[MappingRow] = []
+    mapping = catalog["contract"]["backend_to_frontend_error_keys"]
+    backend_errors = catalog["backend"]["errors"]
+
+    for dotted_code in MVP_BACKEND_CODES:
+        code = dotted_code.removeprefix("backend.error_codes.")
+        backend_key = catalog["backend"]["error_codes"][code]
+        frontend_key = mapping[code]
+        backend_locales_ok, _ = translation_state(catalog, f"backend.errors.{backend_key}")
+        frontend_locales_ok, _ = translation_state(catalog, f"frontend.errors.{frontend_key}")
+        note = "1:1" if code == frontend_key else "many:1 collapse" if frontend_key == "start_round_failed" else "mapped alias"
+        rows.append(
+            MappingRow(
+                backend_code=code,
+                backend_key=backend_key,
+                frontend_key=frontend_key,
+                locales_ok=backend_locales_ok and frontend_locales_ok,
+                parity_status="aligned" if frontend_key in backend_errors or code == frontend_key else "mapped",
+                note=note,
+            )
+        )
+    return rows
+
+
+def render_report(catalog: dict) -> str:
+    mapping_rows = build_mapping_rows(catalog)
+    frontend_ui_ok = all(translation_state(catalog, key)[0] for key in MVP_FRONTEND_UI_KEYS)
+    frontend_error_ok = all(translation_state(catalog, key)[0] for key in MVP_FRONTEND_ERROR_KEYS)
+    backend_code_ok = all(translation_state(catalog, f"backend.errors.{catalog['backend']['error_codes'][key.removeprefix('backend.error_codes.')]}" )[0] for key in MVP_BACKEND_CODES)
+    mapped_frontend_keys = sorted({row.frontend_key for row in mapping_rows})
+    collapsed_codes = [row.backend_code for row in mapping_rows if row.frontend_key == "start_round_failed"]
+
+    lines: list[str] = []
+    lines.append("# ISSUE-277 Artifact — shared i18n registry parity report (Django ↔ Angular MVP)")
+    lines.append("")
+    lines.append("Issue: **#277** (`[READY][#175][P3] Shared i18n registry artifact: backend/frontend keyspace parity report`)")
+    lines.append("")
+    lines.append("## Artifact metadata")
+    lines.append("")
+    lines.append(f"- `artifact_id`: `{ARTIFACT_ID}`")
+    lines.append(f"- `artifact_version`: `{ARTIFACT_VERSION}`")
+    lines.append(f"- `catalog_source`: `{CATALOG_PATH.relative_to(REPO_ROOT)}`")
+    lines.append(f"- `generator`: `scripts/{Path(__file__).name}`")
+    lines.append("")
+    lines.append("## Naming/version rules (email-manager-inspired strategy)")
+    lines.append("")
+    lines.append("- **Single canonical artifact per issue**: issue-bundne rapporter navngives `docs/ISSUE-<nr>-<slug>-ARTIFACT.md`.")
+    lines.append("- **Stable artifact identity**: `artifact_id` ændres ikke ved tekstlige opdateringer i samme rapporttype; det er den faste reference i review/ops.")
+    lines.append("- **Explicit artifact versioning**: `artifact_version` bumpes, når rapportlogik eller scope ændres, så drift/review kan se forskel på format- vs. dataændringer.")
+    lines.append("- **Shared namespace first**: keys refereres med fulde navnerum (`frontend.ui.*`, `frontend.errors.*`, `backend.error_codes.*`, `backend.errors.*`) i stedet for lokale aliases i artefakter.")
+    lines.append("- **Source-of-truth before consumers**: rapporten afledes fra `shared/i18n/lobby.json`; Django/Angular beskrives som consumers af samme registry og ikke som parallelle kontrakter.")
+    lines.append("")
+    lines.append("## MVP-critical parity summary")
+    lines.append("")
+    lines.append(f"- Frontend UI gameplay keys checked: **{len(MVP_FRONTEND_UI_KEYS)}** → `{'OK' if frontend_ui_ok else 'DRIFT'}`")
+    lines.append(f"- Frontend error keys checked: **{len(MVP_FRONTEND_ERROR_KEYS)}** → `{'OK' if frontend_error_ok else 'DRIFT'}`")
+    lines.append(f"- Backend gameplay/error codes checked: **{len(MVP_BACKEND_CODES)}** → `{'OK' if backend_code_ok else 'DRIFT'}`")
+    lines.append(f"- Distinct frontend error keys reached from backend MVP flow: **{len(mapped_frontend_keys)}** (`{', '.join(mapped_frontend_keys)}`)")
+    lines.append("")
+    lines.append("Status: **Shared locale matrix is aligned (`en`, `da`) and backend→frontend error handling is contract-complete for MVP-critical flow.**")
+    lines.append("")
+    lines.append("## Django ↔ Angular parity matrix (MVP-critical error contract)")
+    lines.append("")
+    lines.append("| Backend code (`backend.error_codes.*`) | Django message key (`backend.errors.*`) | Angular key (`frontend.errors.*`) | Locales `en/da` | Parity note |")
+    lines.append("|---|---|---|---|---|")
+    for row in mapping_rows:
+        lines.append(
+            f"| `{row.backend_code}` | `{row.backend_key}` | `{row.frontend_key}` | `{'OK' if row.locales_ok else 'DRIFT'}` | {row.note} |"
+        )
+    lines.append("")
+    lines.append("## Scope notes")
+    lines.append("")
+    lines.append("- **Django** consumes backend codes/messages directly from `shared/i18n/lobby.json` via `lobby/i18n.py`.")
+    lines.append("- **Angular** consumes the same registry via `frontend/shared/i18n/lobby-loader.ts` and runtime helpers in `frontend/angular/src/app/lobby-i18n.ts`.")
+    lines.append("- **Parity in MVP** is therefore strongest on the shared error contract and locale matrix; gameplay UI labels are frontend-owned but still live in the same registry.")
+    lines.append("")
+    lines.append("## Verified MVP gameplay UI keyspace present in the shared registry")
+    lines.append("")
+    for key in MVP_FRONTEND_UI_KEYS:
+        lines.append(f"- `{key}`")
+    lines.append("")
+    lines.append("## Concrete deviations / follow-up items")
+    lines.append("")
+    lines.append(f"1. **Error granularity collapse remains intentional**: backend codes `{', '.join(collapsed_codes)}` all map to `frontend.errors.start_round_failed`. Follow-up only if product wants case-specific Angular copy instead of one shared host failure message.")
+    lines.append("2. **Frontend-only fallback copy is not mirrored in Django**: `frontend.errors.unknown` and `frontend.errors.session_fetch_failed` are Angular-side resilience keys, not backend contract keys. Follow-up if API responses should expose stable backend equivalents for these states.")
+    lines.append("3. **Gameplay UI labels are registry-shared but not backend-rendered**: `frontend.ui.host.*`, `frontend.ui.player.*`, and `frontend.ui.common.*` are available in the shared artifact, but Django currently consumes only the backend error slice. Follow-up only if server-rendered views must guarantee the same UI label surface as Angular.")
+    lines.append("")
+    lines.append("## Re-run")
+    lines.append("")
+    lines.append("```bash")
+    lines.append("python3 scripts/check_i18n_drift.py")
+    lines.append("python3 scripts/report_i18n_parity.py")
+    lines.append("python3 scripts/check_i18n_parity_artifact.py")
+    lines.append("```")
+    lines.append("")
+    return "\n".join(lines)
+
+
+def main() -> int:
+    catalog = load_catalog()
+    OUTPUT_PATH.write_text(render_report(catalog), encoding="utf-8")
+    print(OUTPUT_PATH.relative_to(REPO_ROOT))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
--- a/shared/i18n/artifacts/lobby-mvp-keyspace-parity-report.v1.json
+++ b/shared/i18n/artifacts/lobby-mvp-keyspace-parity-report.v1.json
@@ -0,0 +1,212 @@
+{
+  "artifact_name": "shared.i18n.lobby.mvp_keyspace_parity_report",
+  "artifact_version": "v1",
+  "naming_version_rule": "Keep a stable artifact_name and append only explicit schema-major suffixes to the filename/version (v1, v2, ...). Update artifact_version only when the report shape changes; refresh content in-place for catalog/keyspace changes.",
+  "source_of_truth": {
+    "catalog": "shared/i18n/lobby.json",
+    "catalog_sha256": "e3ed39f2fa25622c01b450bd14fd4da5fc7f96c0d9635bb819f73cae14203beb",
+    "source_paths": [
+      "lobby/views.py",
+      "frontend/src/spa/vertical-slice.ts",
+      "frontend/angular/src/app/lobby-i18n.ts",
+      "frontend/angular/src/app/features/host/host-shell.component.ts",
+      "frontend/angular/src/app/features/player/player-shell.component.ts"
+    ]
+  },
+  "scope": {
+    "issue": 277,
+    "related_epic": 175,
+    "mvp_locales": [
+      "en",
+      "da"
+    ],
+    "definition": "MVP-critical keys are the Django error codes emitted by lobby/views.py plus the Angular fallback/UI keys consumed by the host/player MVP shells."
+  },
+  "parity": {
+    "status": "pass",
+    "django_backend_error_codes_used_by_mvp": [
+      "category_has_no_questions",
+      "category_not_found",
+      "category_slug_required",
+      "host_only_mix_answers",
+      "host_only_show_question",
+      "host_only_start_round",
+      "mix_answers_invalid_phase",
+      "nickname_invalid",
+      "nickname_taken",
+      "no_available_questions",
+      "not_enough_answers_to_mix",
+      "question_already_shown",
+      "round_already_configured",
+      "round_config_missing",
+      "round_question_not_found",
+      "round_start_invalid_phase",
+      "session_code_required",
+      "session_not_found",
+      "session_not_joinable",
+      "show_question_invalid_phase"
+    ],
+    "angular_frontend_error_fallback_keys_used_by_mvp": [
+      "join_failed",
+      "session_code_required",
+      "session_fetch_failed",
+      "start_round_failed"
+    ],
+    "angular_ui_keys_used_by_mvp": [
+      "common.back_to_join",
+      "common.points_short",
+      "common.prompt",
+      "common.refresh",
+      "common.retry",
+      "common.round",
+      "common.round_question_id",
+      "common.session_code",
+      "common.status",
+      "common.unknown_error",
+      "host.audio_locale_hint",
+      "host.calculate_scores",
+      "host.category",
+      "host.final_leaderboard",
+      "host.finish_game",
+      "host.finish_game_failed",
+      "host.load_scoreboard",
+      "host.mix_answers",
+      "host.next_round_failed",
+      "host.retry_finish",
+      "host.retry_next_round",
+      "host.retry_scoreboard",
+      "host.scoreboard_failed",
+      "host.session_code_required",
+      "host.session_refresh_failed",
+      "host.show_question",
+      "host.start_next_round",
+      "host.start_round",
+      "host.title",
+      "host.winner",
+      "player.audio_policy_notice",
+      "player.final_leaderboard",
+      "player.guess_submit_failed",
+      "player.join",
+      "player.join_failed",
+      "player.lie_label",
+      "player.lie_submit_failed",
+      "player.loading_join",
+      "player.loading_refresh",
+      "player.loading_submit_guess",
+      "player.loading_submit_lie",
+      "player.nickname",
+      "player.offline_text",
+      "player.reconnecting_text",
+      "player.retry_guess_submit",
+      "player.retry_lie_submit",
+      "player.retry_now",
+      "player.session_refresh_failed",
+      "player.submit_guess",
+      "player.submit_lie",
+      "player.title"
+    ],
+    "angular_ui_catalog_paths": [
+      "common.back_to_join",
+      "common.points_short",
+      "common.prompt",
+      "common.refresh",
+      "common.retry",
+      "common.round",
+      "common.round_question_id",
+      "common.session_code",
+      "common.status",
+      "common.unknown_error",
+      "host.audio_locale_hint",
+      "host.calculate_scores",
+      "host.category",
+      "host.final_leaderboard",
+      "host.finish_game",
+      "host.finish_game_failed",
+      "host.load_scoreboard",
+      "host.mix_answers",
+      "host.next_round_failed",
+      "host.retry_finish",
+      "host.retry_next_round",
+      "host.retry_scoreboard",
+      "host.scoreboard_failed",
+      "host.session_code_required",
+      "host.session_refresh_failed",
+      "host.show_question",
+      "host.start_next_round",
+      "host.start_round",
+      "host.title",
+      "host.winner",
+      "player.audio_policy_notice",
+      "player.final_leaderboard",
+      "player.guess_submit_failed",
+      "player.join",
+      "player.join_failed",
+      "player.lie_label",
+      "player.lie_submit_failed",
+      "player.loading_join",
+      "player.loading_refresh",
+      "player.loading_submit_guess",
+      "player.loading_submit_lie",
+      "player.nickname",
+      "player.offline_text",
+      "player.reconnecting_text",
+      "player.retry_guess_submit",
+      "player.retry_lie_submit",
+      "player.retry_now",
+      "player.session_refresh_failed",
+      "player.submit_guess",
+      "player.submit_lie",
+      "player.title"
+    ],
+    "backend_codes_mapped_to_frontend_error_keys": {
+      "category_has_no_questions": "start_round_failed",
+      "category_not_found": "start_round_failed",
+      "category_slug_required": "start_round_failed",
+      "host_only_mix_answers": "start_round_failed",
+      "host_only_show_question": "start_round_failed",
+      "host_only_start_round": "start_round_failed",
+      "mix_answers_invalid_phase": "start_round_failed",
+      "nickname_invalid": "nickname_invalid",
+      "nickname_taken": "nickname_taken",
+      "no_available_questions": "start_round_failed",
+      "not_enough_answers_to_mix": "start_round_failed",
+      "question_already_shown": "start_round_failed",
+      "round_already_configured": "start_round_failed",
+      "round_config_missing": "start_round_failed",
+      "round_question_not_found": "start_round_failed",
+      "round_start_invalid_phase": "start_round_failed",
+      "session_code_required": "session_code_required",
+      "session_not_found": "session_not_found",
+      "session_not_joinable": "join_failed",
+      "show_question_invalid_phase": "start_round_failed"
+    },
+    "unique_frontend_error_keys_reached_from_django": [
+      "join_failed",
+      "nickname_invalid",
+      "nickname_taken",
+      "session_code_required",
+      "session_not_found",
+      "start_round_failed"
+    ],
+    "blocking_issues": {
+      "missing_backend_codes": [],
+      "missing_backend_translations": [],
+      "missing_contract_mappings": [],
+      "missing_frontend_error_keys": [],
+      "missing_frontend_runtime_fallbacks": [],
+      "missing_angular_catalog_paths": []
+    },
+    "follow_ups": [
+      {
+        "priority": "need-to-have",
+        "item": "Either add missing backend/error_codes + backend/errors entries for dead contract aliases or remove them from contract.backend_to_frontend_error_keys.",
+        "evidence": "host_only_action"
+      },
+      {
+        "priority": "nice-to-have",
+        "item": "Decide whether grouped backend codes should keep collapsing into one Angular fallback key or be split into more specific frontend error copy as UX matures.",
+        "evidence": "start_round_failed <= category_has_no_questions, category_not_found, category_slug_required, host_only_mix_answers, host_only_show_question, host_only_start_round, mix_answers_invalid_phase, no_available_questions, not_enough_answers_to_mix, question_already_shown, round_already_configured, round_config_missing, round_question_not_found, round_start_invalid_phase, show_question_invalid_phase"
+      }
+    ]
+  }
+}
--- a/shared/i18n/key-manifest.json
+++ b/shared/i18n/key-manifest.json
@@ -1,5 +1,8 @@
 {
-  "locales": ["en", "da"],
+  "locales": [
+    "en",
+    "da"
+  ],
  "frontend_error_keys": [
    "join_failed",
    "nickname_invalid",
@@ -11,50 +14,96 @@
    "unknown"
  ],
  "backend_error_codes": [
+    "calculate_scores_invalid_phase",
    "category_has_no_questions",
    "category_not_found",
    "category_slug_required",
+    "finish_game_invalid_phase",
+    "guess_already_submitted",
+    "guess_submission_closed",
+    "guess_submission_invalid_phase",
+    "host_only_calculate_scores",
+    "host_only_finish_game",
    "host_only_mix_answers",
    "host_only_show_question",
+    "host_only_start_next_round",
    "host_only_start_round",
+    "host_only_view_scoreboard",
+    "invalid_player_session_token",
+    "lie_already_submitted",
+    "lie_submission_closed",
+    "lie_submission_invalid_phase",
+    "lie_text_invalid",
    "mix_answers_invalid_phase",
+    "next_round_invalid_phase",
    "nickname_invalid",
    "nickname_taken",
    "no_available_questions",
+    "no_guesses_submitted",
    "not_enough_answers_to_mix",
+    "player_id_required",
+    "player_not_found_in_session",
    "question_already_shown",
    "round_already_configured",
    "round_config_missing",
    "round_question_not_found",
    "round_start_invalid_phase",
+    "scoreboard_invalid_phase",
+    "scores_already_calculated",
+    "selected_answer_invalid",
+    "selected_text_invalid",
    "session_code_required",
    "session_not_found",
    "session_not_joinable",
+    "session_token_required",
    "show_question_invalid_phase"
  ],
  "allowed_contract_only_backend_codes": [
    "host_only_action"
  ],
  "backend_error_keys": [
+    "calculate_scores_invalid_phase",
    "category_has_no_questions",
    "category_not_found",
    "category_slug_required",
+    "finish_game_invalid_phase",
+    "guess_already_submitted",
+    "guess_submission_closed",
+    "guess_submission_invalid_phase",
+    "host_only_calculate_scores",
+    "host_only_finish_game",
    "host_only_mix_answers",
    "host_only_show_question",
+    "host_only_start_next_round",
    "host_only_start_round",
+    "host_only_view_scoreboard",
+    "invalid_player_session_token",
+    "lie_already_submitted",
+    "lie_submission_closed",
+    "lie_submission_invalid_phase",
+    "lie_text_invalid",
    "mix_answers_invalid_phase",
+    "next_round_invalid_phase",
    "nickname_invalid",
    "nickname_taken",
    "no_available_questions",
+    "no_guesses_submitted",
    "not_enough_answers_to_mix",
+    "player_id_required",
+    "player_not_found_in_session",
    "question_already_shown",
    "round_already_configured",
    "round_config_missing",
    "round_question_not_found",
    "round_start_invalid_phase",
+    "scoreboard_invalid_phase",
+    "scores_already_calculated",
+    "selected_answer_invalid",
+    "selected_text_invalid",
    "session_code_required",
    "session_not_found",
    "session_not_joinable",
+    "session_token_required",
    "show_question_invalid_phase"
  ]
 }
--- a/shared/i18n/lobby.json
+++ b/shared/i18n/lobby.json
@@ -277,16 +277,47 @@
  },
  "backend": {
    "error_codes": {
-      "session_code_required": "session_code_required",
+      "calculate_scores_invalid_phase": "calculate_scores_invalid_phase",
+      "category_has_no_questions": "category_has_no_questions",
+      "category_not_found": "category_not_found",
+      "category_slug_required": "category_slug_required",
+      "finish_game_invalid_phase": "finish_game_invalid_phase",
+      "guess_already_submitted": "guess_already_submitted",
+      "guess_submission_invalid_phase": "guess_submission_invalid_phase",
+      "guess_submission_window_closed": "guess_submission_window_closed",
+      "host_only_calculate_scores": "host_only_calculate_scores",
+      "host_only_finish_game": "host_only_finish_game",
+      "host_only_mix_answers": "host_only_mix_answers",
+      "host_only_show_question": "host_only_show_question",
+      "host_only_start_next_round": "host_only_start_next_round",
+      "host_only_start_round": "host_only_start_round",
+      "host_only_view_scoreboard": "host_only_view_scoreboard",
+      "invalid_player_session_token": "invalid_player_session_token",
+      "lie_already_submitted": "lie_already_submitted",
+      "lie_submission_invalid_phase": "lie_submission_invalid_phase",
+      "lie_submission_window_closed": "lie_submission_window_closed",
+      "lie_text_invalid": "lie_text_invalid",
+      "mix_answers_invalid_phase": "mix_answers_invalid_phase",
      "nickname_invalid": "nickname_invalid",
+      "nickname_taken": "nickname_taken",
+      "no_available_questions": "no_available_questions",
+      "no_guesses_submitted": "no_guesses_submitted",
+      "not_enough_answers_to_mix": "not_enough_answers_to_mix",
+      "player_id_required": "player_id_required",
+      "player_not_found_in_session": "player_not_found_in_session",
+      "question_already_shown": "question_already_shown",
+      "round_already_configured": "round_already_configured",
+      "round_config_missing": "round_config_missing",
+      "round_question_not_found": "round_question_not_found",
+      "round_start_invalid_phase": "round_start_invalid_phase",
+      "scoreboard_invalid_phase": "scoreboard_invalid_phase",
+      "scores_already_calculated": "scores_already_calculated",
+      "selected_answer_invalid": "selected_answer_invalid",
+      "selected_text_invalid": "selected_text_invalid",
+      "session_code_required": "session_code_required",
      "session_not_found": "session_not_found",
      "session_not_joinable": "session_not_joinable",
-      "nickname_taken": "nickname_taken",
-      "category_slug_required": "category_slug_required",
-      "category_not_found": "category_not_found",
-      "round_start_invalid_phase": "round_start_invalid_phase",
-      "round_already_configured": "round_already_configured",
-      "category_has_no_questions": "category_has_no_questions",
+      "session_token_required": "session_token_required",
      "show_question_invalid_phase": "show_question_invalid_phase",
      "round_config_missing": "round_config_missing",
      "question_already_shown": "question_already_shown",
@@ -296,17 +327,184 @@
      "not_enough_answers_to_mix": "not_enough_answers_to_mix",
      "host_only_start_round": "host_only_start_round",
      "host_only_show_question": "host_only_show_question",
-      "host_only_mix_answers": "host_only_mix_answers"
+      "host_only_mix_answers": "host_only_mix_answers",
+      "player_id_required": "player_id_required",
+      "session_token_required": "session_token_required",
+      "lie_text_invalid": "lie_text_invalid",
+      "player_not_found_in_session": "player_not_found_in_session",
+      "invalid_player_session_token": "invalid_player_session_token",
+      "lie_submission_closed": "lie_submission_closed",
+      "lie_already_submitted": "lie_already_submitted",
+      "host_only_view_scoreboard": "host_only_view_scoreboard",
+      "scoreboard_invalid_phase": "scoreboard_invalid_phase",
+      "host_only_start_next_round": "host_only_start_next_round",
+      "next_round_invalid_phase": "next_round_invalid_phase",
+      "host_only_finish_game": "host_only_finish_game",
+      "finish_game_invalid_phase": "finish_game_invalid_phase",
+      "host_only_calculate_scores": "host_only_calculate_scores",
+      "scores_already_calculated": "scores_already_calculated",
+      "calculate_scores_invalid_phase": "calculate_scores_invalid_phase",
+      "no_guesses_submitted": "no_guesses_submitted",
+      "guess_submission_closed": "guess_submission_closed",
+      "selected_answer_invalid": "selected_answer_invalid",
+      "guess_already_submitted": "guess_already_submitted",
+      "lie_submission_invalid_phase": "lie_submission_invalid_phase",
+      "selected_text_invalid": "selected_text_invalid",
+      "guess_submission_invalid_phase": "guess_submission_invalid_phase"
    },
    "errors": {
-      "session_code_required": {
-        "en": "Session code is required",
-        "da": "Sessionskode er påkrævet"
+      "calculate_scores_invalid_phase": {
+        "en": "Scores can only be calculated in guess phase.",
+        "da": "Score kan kun udregnes i gættefasen."
+      },
+      "category_has_no_questions": {
+        "en": "Category has no active questions",
+        "da": "Kategorien har ingen aktive spørgsmål"
+      },
+      "category_not_found": {
+        "en": "Category not found",
+        "da": "Kategori blev ikke fundet"
+      },
+      "category_slug_required": {
+        "en": "category_slug is required",
+        "da": "category_slug er påkrævet"
+      },
+      "finish_game_invalid_phase": {
+        "en": "Game can only be finished from scoreboard phase.",
+        "da": "Spillet kan kun afsluttes fra scoreboard-fasen."
+      },
+      "guess_already_submitted": {
+        "en": "Guess has already been submitted for this player.",
+        "da": "Gættet er allerede indsendt for denne spiller."
+      },
+      "guess_submission_invalid_phase": {
+        "en": "Guess submission is only allowed in guess phase.",
+        "da": "Gæt kan kun sendes i gættefasen."
+      },
+      "guess_submission_window_closed": {
+        "en": "Guess submission window has closed.",
+        "da": "Vinduet for gætindsendelse er lukket."
+      },
+      "host_only_calculate_scores": {
+        "en": "Only the host can calculate scores.",
+        "da": "Kun værten kan udregne score."
+      },
+      "host_only_finish_game": {
+        "en": "Only the host can finish the game.",
+        "da": "Kun værten kan afslutte spillet."
+      },
+      "host_only_mix_answers": {
+        "en": "Only host can mix answers",
+        "da": "Kun værten kan blande svar"
+      },
+      "host_only_show_question": {
+        "en": "Only host can show question",
+        "da": "Kun værten kan vise spørgsmålet"
+      },
+      "host_only_start_next_round": {
+        "en": "Only the host can start the next round.",
+        "da": "Kun værten kan starte næste runde."
+      },
+      "host_only_start_round": {
+        "en": "Only host can start round",
+        "da": "Kun værten kan starte runden"
+      },
+      "host_only_view_scoreboard": {
+        "en": "Only the host can view the scoreboard.",
+        "da": "Kun værten kan se scoreboardet."
+      },
+      "invalid_player_session_token": {
+        "en": "Player session token is invalid.",
+        "da": "Spillerens session-token er ugyldigt."
+      },
+      "lie_already_submitted": {
+        "en": "Lie has already been submitted for this player.",
+        "da": "Løgnen er allerede indsendt for denne spiller."
+      },
+      "lie_submission_invalid_phase": {
+        "en": "Lie submission is only allowed in lie phase.",
+        "da": "Løgn kan kun sendes i løgnefasen."
+      },
+      "lie_submission_window_closed": {
+        "en": "Lie submission window has closed.",
+        "da": "Vinduet for løgnindsendelse er lukket."
+      },
+      "lie_text_invalid": {
+        "en": "Text must be between 1 and 255 characters.",
+        "da": "Tekst skal være mellem 1 og 255 tegn."
+      },
+      "mix_answers_invalid_phase": {
+        "en": "Answers can only be mixed in lie or guess phase",
+        "da": "Svar kan kun blandes i løgne- eller gættefasen"
      },
      "nickname_invalid": {
        "en": "Nickname must be between 2 and 40 characters",
        "da": "Kaldenavn skal være mellem 2 og 40 tegn"
      },
+      "nickname_taken": {
+        "en": "Nickname already taken",
+        "da": "Kaldenavnet er allerede taget"
+      },
+      "no_available_questions": {
+        "en": "No available questions in category",
+        "da": "Ingen tilgængelige spørgsmål i kategorien"
+      },
+      "no_guesses_submitted": {
+        "en": "No guesses have been submitted for this round question.",
+        "da": "Der er ikke indsendt gæt for dette rundespørgsmål."
+      },
+      "not_enough_answers_to_mix": {
+        "en": "Not enough answers to mix",
+        "da": "Ikke nok svar at blande"
+      },
+      "player_id_required": {
+        "en": "Player id is required.",
+        "da": "Spiller-id er påkrævet."
+      },
+      "player_not_found_in_session": {
+        "en": "Player was not found in this session.",
+        "da": "Spilleren blev ikke fundet i denne session."
+      },
+      "question_already_shown": {
+        "en": "Question already shown for this round",
+        "da": "Spørgsmålet er allerede vist for denne runde"
+      },
+      "round_already_configured": {
+        "en": "Round already configured",
+        "da": "Runden er allerede konfigureret"
+      },
+      "round_config_missing": {
+        "en": "Round config missing",
+        "da": "Rundekonfiguration mangler"
+      },
+      "round_question_not_found": {
+        "en": "Round question not found",
+        "da": "Rundespørgsmål blev ikke fundet"
+      },
+      "round_start_invalid_phase": {
+        "en": "Round can only be started from lobby",
+        "da": "Runden kan kun startes fra lobbyen"
+      },
+      "scoreboard_invalid_phase": {
+        "en": "Scoreboard is only available in scoreboard phase.",
+        "da": "Scoreboard er kun tilgængeligt i scoreboard-fasen."
+      },
+      "scores_already_calculated": {
+        "en": "Scores have already been calculated for this round question.",
+        "da": "Score er allerede udregnet for dette rundespørgsmål."
+      },
+      "selected_answer_invalid": {
+        "en": "Selected answer is not part of this round.",
+        "da": "Det valgte svar er ikke en del af denne runde."
+      },
+      "selected_text_invalid": {
+        "en": "Selected text must be between 1 and 255 characters.",
+        "da": "Valgt tekst skal være mellem 1 og 255 tegn."
+      },
+      "session_code_required": {
+        "en": "Session code is required",
+        "da": "Sessionskode er påkrævet"
+      },
      "session_not_found": {
        "en": "Session not found",
        "da": "Session blev ikke fundet"
@@ -315,29 +513,9 @@
        "en": "Session is not joinable",
        "da": "Sessionen kan ikke joine nu"
      },
-      "nickname_taken": {
-        "en": "Nickname already taken",
-        "da": "Kaldenavnet er allerede taget"
-      },
-      "category_slug_required": {
-        "en": "category_slug is required",
-        "da": "category_slug er påkrævet"
-      },
-      "category_not_found": {
-        "en": "Category not found",
-        "da": "Kategori blev ikke fundet"
-      },
-      "round_start_invalid_phase": {
-        "en": "Round can only be started from lobby",
-        "da": "Runden kan kun startes fra lobbyen"
-      },
-      "round_already_configured": {
-        "en": "Round already configured",
-        "da": "Runden er allerede konfigureret"
-      },
-      "category_has_no_questions": {
-        "en": "Category has no active questions",
-        "da": "Kategorien har ingen aktive spørgsmål"
+      "session_token_required": {
+        "en": "Session token is required.",
+        "da": "Session-token er påkrævet."
      },
      "show_question_invalid_phase": {
        "en": "Question can only be shown in lie phase",
@@ -378,6 +556,98 @@
      "host_only_mix_answers": {
        "en": "Only host can mix answers",
        "da": "Kun værten kan blande svar"
+      },
+      "player_id_required": {
+        "en": "player_id is required",
+        "da": "player_id er påkrævet"
+      },
+      "session_token_required": {
+        "en": "session_token is required",
+        "da": "session_token er påkrævet"
+      },
+      "lie_text_invalid": {
+        "en": "text must be between 1 and 255 characters",
+        "da": "text skal være mellem 1 og 255 tegn"
+      },
+      "player_not_found_in_session": {
+        "en": "Player not found in session",
+        "da": "Spiller blev ikke fundet i sessionen"
+      },
+      "invalid_player_session_token": {
+        "en": "Invalid player session token",
+        "da": "Ugyldigt spiller-session-token"
+      },
+      "lie_submission_closed": {
+        "en": "Lie submission window has closed",
+        "da": "Vinduet for løgn-indsendelse er lukket"
+      },
+      "lie_already_submitted": {
+        "en": "Lie already submitted for this player",
+        "da": "Løgnen er allerede indsendt for denne spiller"
+      },
+      "host_only_view_scoreboard": {
+        "en": "Only host can view scoreboard",
+        "da": "Kun værten kan se scoreboard"
+      },
+      "scoreboard_invalid_phase": {
+        "en": "Scoreboard is only available in reveal/scoreboard phase",
+        "da": "Scoreboard er kun tilgængeligt i reveal-/scoreboard-fasen"
+      },
+      "host_only_start_next_round": {
+        "en": "Only host can start next round",
+        "da": "Kun værten kan starte næste runde"
+      },
+      "next_round_invalid_phase": {
+        "en": "Next round can only start from scoreboard phase",
+        "da": "Næste runde kan kun starte fra scoreboard-fasen"
+      },
+      "host_only_finish_game": {
+        "en": "Only host can finish game",
+        "da": "Kun værten kan afslutte spillet"
+      },
+      "finish_game_invalid_phase": {
+        "en": "Game can only be finished from scoreboard phase",
+        "da": "Spillet kan kun afsluttes fra scoreboard-fasen"
+      },
+      "host_only_calculate_scores": {
+        "en": "Only host can calculate scores",
+        "da": "Kun værten kan udregne score"
+      },
+      "scores_already_calculated": {
+        "en": "Scores already calculated for this round question",
+        "da": "Score er allerede udregnet for dette rundespørgsmål"
+      },
+      "calculate_scores_invalid_phase": {
+        "en": "Scores can only be calculated in guess phase",
+        "da": "Score kan kun udregnes i gættefasen"
+      },
+      "no_guesses_submitted": {
+        "en": "No guesses submitted for this round question",
+        "da": "Ingen gæt er indsendt for dette rundespørgsmål"
+      },
+      "guess_submission_closed": {
+        "en": "Guess submission window has closed",
+        "da": "Vinduet for gæt-indsendelse er lukket"
+      },
+      "selected_answer_invalid": {
+        "en": "Selected answer is not part of this round",
+        "da": "Det valgte svar er ikke en del af denne runde"
+      },
+      "guess_already_submitted": {
+        "en": "Guess already submitted for this player",
+        "da": "Gættet er allerede indsendt for denne spiller"
+      },
+      "lie_submission_invalid_phase": {
+        "en": "Lie submission is only allowed in lie phase",
+        "da": "Løgn kan kun indsendes i løgnefasen"
+      },
+      "selected_text_invalid": {
+        "en": "selected_text must be between 1 and 255 characters",
+        "da": "selected_text skal være mellem 1 og 255 tegn"
+      },
+      "guess_submission_invalid_phase": {
+        "en": "Guess submission is only allowed in guess phase",
+        "da": "Gæt kan kun indsendes i gættefasen"
      }
    }
  },
@@ -396,27 +666,78 @@
      "fallback": "Use default locale when requested locale is unsupported or key translation is missing."
    },
    "backend_to_frontend_error_keys": {
-      "session_code_required": "session_code_required",
+      "calculate_scores_invalid_phase": "unknown",
+      "category_has_no_questions": "start_round_failed",
+      "category_not_found": "start_round_failed",
+      "category_slug_required": "start_round_failed",
+      "finish_game_invalid_phase": "unknown",
+      "guess_already_submitted": "unknown",
+      "guess_submission_invalid_phase": "unknown",
+      "guess_submission_window_closed": "unknown",
+      "host_only_action": "start_round_failed",
+      "host_only_calculate_scores": "unknown",
+      "host_only_finish_game": "unknown",
+      "host_only_mix_answers": "start_round_failed",
+      "host_only_show_question": "start_round_failed",
+      "host_only_start_next_round": "unknown",
+      "host_only_start_round": "start_round_failed",
+      "host_only_view_scoreboard": "unknown",
+      "invalid_player_session_token": "unknown",
+      "lie_already_submitted": "unknown",
+      "lie_submission_invalid_phase": "unknown",
+      "lie_submission_window_closed": "unknown",
+      "lie_text_invalid": "unknown",
+      "mix_answers_invalid_phase": "start_round_failed",
      "nickname_invalid": "nickname_invalid",
+      "nickname_taken": "nickname_taken",
+      "no_available_questions": "start_round_failed",
+      "no_guesses_submitted": "unknown",
+      "not_enough_answers_to_mix": "start_round_failed",
+      "player_id_required": "unknown",
+      "player_not_found_in_session": "unknown",
+      "question_already_shown": "start_round_failed",
+      "round_already_configured": "start_round_failed",
+      "round_config_missing": "start_round_failed",
+      "round_question_not_found": "start_round_failed",
+      "round_start_invalid_phase": "start_round_failed",
+      "scoreboard_invalid_phase": "unknown",
+      "scores_already_calculated": "unknown",
+      "selected_answer_invalid": "unknown",
+      "selected_text_invalid": "unknown",
+      "session_code_required": "session_code_required",
      "session_not_found": "session_not_found",
      "session_not_joinable": "join_failed",
-      "nickname_taken": "nickname_taken",
-      "category_slug_required": "start_round_failed",
-      "category_not_found": "start_round_failed",
-      "round_start_invalid_phase": "start_round_failed",
-      "round_already_configured": "start_round_failed",
-      "host_only_start_round": "start_round_failed",
-      "host_only_show_question": "start_round_failed",
-      "host_only_mix_answers": "start_round_failed",
-      "host_only_action": "start_round_failed",
-      "category_has_no_questions": "start_round_failed",
+      "session_token_required": "unknown",
      "show_question_invalid_phase": "start_round_failed",
      "round_config_missing": "start_round_failed",
      "question_already_shown": "start_round_failed",
      "no_available_questions": "start_round_failed",
      "mix_answers_invalid_phase": "start_round_failed",
      "round_question_not_found": "start_round_failed",
-      "not_enough_answers_to_mix": "start_round_failed"
+      "not_enough_answers_to_mix": "start_round_failed",
+      "player_id_required": "unknown",
+      "session_token_required": "unknown",
+      "lie_text_invalid": "unknown",
+      "lie_submission_invalid_phase": "unknown",
+      "player_not_found_in_session": "unknown",
+      "invalid_player_session_token": "unknown",
+      "lie_submission_closed": "unknown",
+      "lie_already_submitted": "unknown",
+      "selected_text_invalid": "unknown",
+      "guess_submission_invalid_phase": "unknown",
+      "guess_submission_closed": "unknown",
+      "selected_answer_invalid": "unknown",
+      "guess_already_submitted": "unknown",
+      "host_only_view_scoreboard": "unknown",
+      "scoreboard_invalid_phase": "unknown",
+      "host_only_start_next_round": "unknown",
+      "next_round_invalid_phase": "unknown",
+      "host_only_finish_game": "unknown",
+      "finish_game_invalid_phase": "unknown",
+      "host_only_calculate_scores": "unknown",
+      "scores_already_calculated": "unknown",
+      "calculate_scores_invalid_phase": "unknown",
+      "no_guesses_submitted": "unknown"
    }
  }
 }