feat(spa): sync host/player hash routes with gameplay phase

.gitea/workflows/ci.yml

@@ -31,14 +31,3 @@ jobs:
 
       - name: Tests
         run: python manage.py test lobby -v 1
-
-      - name: Setup Node
-        uses: actions/setup-node@v4
-        with:
-          node-version: "22"
-
-      - name: Install SPA dependencies
-        run: npm ci --prefix frontend/angular
-
-      - name: SPA Angular smoke tests
-        run: npm --prefix frontend/angular test

docs/I18N_ARCHITECTURE.md

@@ -1,48 +0,0 @@
-# Shared i18n architecture (frontend + backend)
-
-## Scope
-Issue #175 requires one shared i18n contract for MVP host/player flows across frontend and backend.
-
-## Source of truth
-- Catalog: `shared/i18n/lobby.json`
-- Locales:
-  - supported: `en`, `da`
-  - default/fallback: `en`
-
-Both Angular (`frontend/angular/src/app/lobby-i18n.ts`) and Django (`lobby/i18n.py`) read from this catalog.
-
-## Key naming convention
-- Domain-first namespaces:
-  - `frontend.ui.common.*`
-  - `frontend.ui.host.*`
-  - `frontend.ui.player.*`
-  - `frontend.errors.*`
-  - `backend.errors.*`
-  - `backend.error_codes.*`
-- UI lookup keys in Angular are shortened aliases mapped under `frontend.ui`, e.g.:
-  - `host.start_round`
-  - `player.submit_guess`
-  - `common.session_code`
-- Backend API errors return stable code + localized message:
-  - `error_code` = machine-stable key from `backend.error_codes`
-  - `error` = localized message from `backend.errors`
-  - `locale` = resolved request locale
-
-## Fallback model (robust)
-1. Resolve requested locale (`Accept-Language` on backend, user/browser preference on frontend).
-2. If locale unsupported -> use default `en`.
-3. If key missing -> return key and log warning.
-4. If locale translation missing for key -> fallback to `en` translation.
-
-## Audio-routing policy
-- Catalog capability: `frontend.capabilities.client_has_no_audio_output = true`
-- Host/player clients expose this as a read-only capability flag.
-- Policy: phone clients must not play audio directly; only primary/host output is allowed.
-
-## Verification
-- Backend tests: `lobby/tests.py` i18n coverage for locale selection + fallback + error-code/message matrix.
-- Frontend smoke/e2e-level unit coverage:
-  - `frontend/angular/src/app/lobby-i18n.spec.ts`
-  - `frontend/angular/src/app/i18n-mvp-flow-smoke.spec.ts`
-  - `frontend/angular/src/app/features/host/host-shell.component.spec.ts`
-  - `frontend/angular/src/app/features/player/player-shell.component.spec.ts`

docs/ISSUE-175-I18N-SHARED-CONTRACT-ARTIFACT.md

@@ -1,35 +0,0 @@
-# ISSUE-175 Artifact — shared i18n contract + MVP host/player flow
-
-## Delivered
-- Shared i18n contract is centralized in `shared/i18n/lobby.json` (da/en, default `en`, robust fallback).
-- Frontend host/player MVP copy is read via shared keys (no hardcoded Danish strings in Angular MVP flow components).
-- Backend error messages resolve from shared keyspace with locale-aware API payload (`error_code`, `error`, `locale`).
-- Audio-routing policy is explicit and shared: `frontend.capabilities.client_has_no_audio_output=true`.
-- Architecture + key naming documented in `docs/I18N_ARCHITECTURE.md`.
-
-## Smoke / e2e evidence
-### Backend locale + fallback
-Command:
-```bash
-. .venv/bin/activate && python manage.py test \
-  lobby.tests.LobbyFlowTests.test_join_error_localizes_to_danish_with_accept_language_header \
-  lobby.tests.LobbyFlowTests.test_join_error_falls_back_to_english_for_unsupported_locale \
-  lobby.tests.I18nResolverTests
-```
-Result:
-- PASS (7 tests)
-- Confirms `da` localization and fallback to `en` for unsupported locale.
-
-### Frontend host/player + language switch + audio policy
-Command:
-```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
-```
-Result:
-- PASS (22 tests)
-- Includes smoke for host/player copy in **both en and da** and verifies primary-only audio policy flag (`clientHasNoAudioOutput=true`).

docs/ISSUE-188-SPA-CUTOVER-HARDENING-ARTIFACT.md

@@ -1,47 +0,0 @@
-# Issue #188 Artifact — SPA cutover hardening (asset versioning + rollback)
-
-## Scope
-Acceptance for `[READY][SPA][P11] Cutover hardening`:
-1. Dokumenteret strategi for cache-busting/versionering af SPA assets i Django staticfiles/reverse proxy setup.
-2. Konfigurerbar rollback-procedure for `USE_SPA_UI` (trin-for-trin, target <10 min).
-3. Smoke-artefakt for både SPA on/off i samme release-vindue.
-4. Ingen gameplay-ændringer.
-
-## 1) Asset versioning/cache-busting strategi
-Implementeret i SPA shell render-path:
-
-- Konfiguration i `partyhub/settings.py`:
-  - `WPP_SPA_ASSET_BASE` (eksisterende)
-  - `WPP_SPA_ASSET_VERSION` (ny)
-- `lobby/ui_views.py` injicerer `spa_asset_version` til template-context.
-- `lobby/templates/lobby/spa_shell.html` appender `?v={{ spa_asset_version }}` på:
-  - `styles.css`
-  - `main.js`
-
-Effekt:
-- Ny release-version (fx SHA/tag) kan tvinge cache-miss i browser/proxy uden ændring af route.
-- Rollback kan pege på tidligere stabil version-token med samme mekanisme.
-
-## 2) Rollback playbook (`USE_SPA_UI`) — target <10 min
-Dokumenteret i `docs/spa-cutover-flag.md`:
-
-1. Sæt `USE_SPA_UI=false`.
-2. Sæt `WPP_SPA_ASSET_VERSION` til sidste stabile release-token.
-3. Deploy/reload app-processer.
-4. Verificér legacy routes (`/lobby/ui/host` + `/lobby/ui/player`).
-5. Kør hurtig smoke sanity.
-6. Log trigger/timestamp/resultat i smoke artifact.
-
-## 3) Smoke artifact for SPA OFF/ON i samme release-vindue
-Dokumenteret i:
-- `docs/UI_SMOKE.md` (sektion: "Samme release-vindue: SPA OFF + ON verifikation")
-- `docs/STAGING_GAMEPLAY_SMOKE_ARTIFACT.md` (template udvidet med release-window check + `WPP_SPA_ASSET_VERSION`)
-
-Krav:
-- OFF-pass (legacy) og ON-pass (SPA) køres i samme deploy/release-vindue.
-- Begge passes logges i samme artifact med UTC timestamps og version-token.
-
-## Non-goals bekræftet
-- Ingen gameplay-regler ændret.
-- Ingen API-kontrakter ændret.
-- Ingen UX-redesign; kun drift/cutover-hardening.

docs/ISSUE-200-SPA-HOST-PLAYER-PHASE-SYNC-ARTIFACT.md

@@ -1,57 +0,0 @@
-# Issue #200 Artifact — SPA host→player phase sync (no reload)
-
-## Scope
-Acceptance for `[READY][SPA][P14] Gameplay MVP-del 5`:
-1. Host handlinger (`start round` / `næste fase`) propagere korrekt til player-ruter i SPA.
-2. Happy-path artefakt for én fuld faseovergang uden page reload.
-3. Sync-fejl giver kontrolleret fallback/error state.
-
-Afgrænsning overholdt: ingen nye spilregler og ingen redesign af backend event-model.
-
-## Happy-path faseovergang (uden page reload)
-Reference-flow i Angular shell:
-
-1. **Host starter runde/fase**
-   - Host action kalder backend endpoint (`POST /lobby/sessions/:code/start` eller fase-endpoint)
-   - Host shell hydrerer session igen (`GET /lobby/sessions/:code`)
-   - Host route synkes via hash-rewrite i samme SPA shell:
-     - `#/host/<phase>/<CODE>`
-     - Implementeret i `HostShellComponent.syncRouteFromSession()`
-
-2. **Player modtager ny fase via state sync**
-   - Player shell kører periodisk session-refresh (3s), uden hard reload
-   - Når `session.status` ændrer sig, synkes hash-route i samme SPA shell:
-     - `#/player/<phase>/<CODE>`
-     - Implementeret i `PlayerShellComponent.syncRouteFromSession()`
-
-3. **Ingen page reload**
-   - Routing sker med `window.history.replaceState(...)`
-   - URL opdateres i eksisterende SPA instans (ingen template-hop, ingen full refresh)
-
-## Kontrolleret fallback ved sync-fejl
-Når player-sync fejler (netværk/fetch/session-refresh):
-
-- UI går i kontrolleret connection-state:
-  - `reconnecting` ved online netværksfejl
-  - `offline` når browser rapporterer offline
-- Fejl vises med retry/back-to-join handlinger
-- Reconnect forsøges igen via timer (`scheduleReconnect`) uden at crashe shell
-
-## Verifikation (tests)
-Kørt i `frontend/angular` med Vitest:
-
-- `src/app/features/host/host-shell.component.spec.ts`
-  - Verificerer host-faseflow og hash-route sync uden reload
-- `src/app/features/player/player-shell.component.spec.ts`
-  - Verificerer periodisk player state sync + hash-route sync
-  - Verificerer reconnect/offline fallback ved sync-fejl
-- `src/app/api-contract-smoke.spec.ts`
-- `src/app/session-route-context.spec.ts`
-
-Kommando:
-
-```bash
-npm test -- --reporter=dot
-```
-
-Resultat: **4/4 testfiler grønne, 22/22 tests bestået**.

docs/ISSUE-205-I18N-FOUNDATION.md

@@ -1,36 +0,0 @@
-# Issue #205 — Django i18n foundation (da/en)
-
-## Implemented acceptance checks
-
-- **Django i18n setup for `en` + `da` with `en` fallback**
-  - `LANGUAGE_CODE` set to `en`.
-  - `LANGUAGES = [('en', 'English'), ('da', 'Danish')]`.
-  - `LocaleMiddleware` enabled in middleware chain.
-- **Shared-key resolver/adapter (no ad hoc backend mapping)**
-  - Backend error responses now resolve from shared catalog keys in `shared/i18n/lobby.json`.
-  - `lobby.i18n.api_error()` accepts a shared key and resolves locale-specific text.
-- **Representative API flow documented with key/locale behavior**
-  - `POST /lobby/join` with empty code returns:
-    - `error_code: "session_code_required"`
-    - localized `error`
-    - resolved `locale`
-- **Missing key handling deterministic and loggable**
-  - `resolve_error_message()` returns key string when key/translation is missing.
-  - Warning is logged (`lobby.i18n` logger) for missing key/translation.
-
-## Example response behavior
-
-### Request
-`POST /lobby/join` with empty code and header `Accept-Language: da`
-
-### Response (400)
-
-```json
-{
-  "error": "Sessionskode er påkrævet",
-  "error_code": "session_code_required",
-  "locale": "da"
-}
-```
-
-If locale is unsupported (e.g. `fr`), response uses `locale: "en"` and English message.

docs/ISSUE-207-I18N-AUDIO-SMOKE-ARTIFACT.md

@@ -1,35 +0,0 @@
-# Issue #207 Artifact — da/en locale switch + audio routing (primary-only)
-
-## Scope
-Acceptance for `[READY][i18n][P19]`:
-1. Verify one MVP host+player flow in both `en` and `da` locale context.
-2. Verify controlled fallback to `en` when a locale key is missing.
-3. Verify audio-routing policy is primary-only (client/player has no audio output).
-
-No new feature behavior added — this is verification-only evidence.
-
-## Smoke/e2e evidence (Angular shell test run)
-Executed from `frontend/angular`:
-
-```bash
-npm test -- --reporter=dot src/app/lobby-i18n.spec.ts src/app/features/host/host-shell.component.spec.ts src/app/features/player/player-shell.component.spec.ts
-```
-
-Evidence covered by the run:
-- `lobby-i18n.spec.ts`
-  - subscriber locale switch updates (`en -> da -> en`)
-  - controlled fallback where `da` key is removed during test and `en` copy is returned
-  - `clientHasNoAudioOutput === true` (primary-only audio routing)
-- `host-shell.component.spec.ts`
-  - host actions and route sync in SPA (no reload)
-- `player-shell.component.spec.ts`
-  - player session refresh/sync path and retry behavior
-
-## Policy evidence
-- Shared catalog capability: `shared/i18n/lobby.json`
-  - `frontend.capabilities.client_has_no_audio_output = true`
-- Angular host/player shells bind this capability:
-  - `HostShellComponent.clientHasNoAudioOutput`
-  - `PlayerShellComponent.clientHasNoAudioOutput`
-
-Conclusion: locale switching works in `da`/`en`, fallback resolves to `en` when locale key is intentionally missing, and client audio remains disabled by policy (`primary-only`).

docs/ISSUE-223-PLAYER-AUDIO-GUARD-ARTIFACT.md

@@ -1,20 +0,0 @@
-# Issue #223 — Telefon-klient audio guard (artifact)
-
-## Scope leveret
-- Telefon-/player-klient installerer en eksplicit audio guard ved mount (`installSecondaryDeviceAudioGuard`).
-- Guard overskriver `HTMLMediaElement.prototype.play` til en no-op på secondary device (client policy: `client_has_no_audio_output=true`).
-- Guard fjernes igen ved unmount (`ngOnDestroy`) så øvrige flows/enheder ikke påvirkes.
-- Ingen audio-controls er eksponeret i player-shell UI.
-
-## Acceptance mapping
-1. **Telefon-klient trigger ikke audio playback i kerneflow**
-   - Verificeret af test: `player-shell.component.spec.ts` (`installs secondary-device audio guard while player shell is mounted`).
-2. **Primær enhed påvirkes ikke negativt**
-   - Guard er scoped til player-shell lifecycle og restore'r original `play` ved destroy.
-3. **Enkel test/verifikation dokumenteret**
-   - Dokumenteret her + testkørsel nedenfor.
-
-## Testkørsel
-- Kommando:
-  - `cd frontend/angular && npm test -- src/app/features/player/player-shell.component.spec.ts`
-- Resultat: bestået (inkl. audio-guard test).

docs/ISSUE-224-TRUNK-SEQUENCE-175.md

@@ -1,55 +0,0 @@
-# Issue #224 — Trunk-sekvens for #175 (A/B/C)
-
-Formål: gøre #175 scheduler-klar som tre små, uafhængige og mergeklare bidder.
-
-## Sekvens
-
-### A) Backend i18n baseline
-- Tracking issue: #225
-- Scope:
-  - Backend resolver til locale (da/en)
-  - Fallback til `en` ved unsupported locale
-  - Stabil fejlkontrakt i payload (`error_code`, `error`, `locale`)
-- Mergebarhed: Kan merges uden frontend-ændringer.
-- Acceptance:
-  - Backend tests dækker `da` + fallback `en`
-  - Kontraktfelter er stabile i response
-
-### B) Shared key-map + locale-kontrakt
-- Tracking issue: #226
-- Scope:
-  - Én shared key-map for lobby/kerneflow
-  - Locale-kontrakt (tilladte locales, default locale, fallback-regler)
-  - Dokumentation af naming + ownership
-- Mergebarhed: Kan merges uden host/player UI-migrering.
-- Acceptance:
-  - Shared kontrakt findes ét sted
-  - Begge sider kan importere den
-  - Docs opdateret med da/en eksempler
-
-### C) Angular host/player integration + hardcoded-text cleanup
-- Tracking issue: #227
-- Scope:
-  - Angular host/player kerneflow bruger shared keys
-  - Hardcoded tekster fjernes i aftalte kernekomponenter
-  - Sprogskift verificeres i kritiske states
-- Mergebarhed: Kan merges selvstændigt når frontend-tests er grønne.
-- Acceptance:
-  - Korrekt i18n-copy i da/en i kerneflow
-  - Ingen hardcoded kerneflow-tekster tilbage
-  - Frontend tests/smoke grønne
-
-## PR-grænser (per bid)
-- 1 PR pr. bid (A/B/C) mod `main`
-- Mål: ~200–300 net LOC per PR (ekskl. generated artefakter)
-- Undgå cross-layer scope creep
-- Review-tid <30 min
-
-## Overordnet acceptance for #224
-- A/B/C-sekvens er tydelig med links
-- Hver bid er mergebar isoleret
-- Scheduler kan assign’e direkte uden ekstra afklaring
-
-## Verification (docs-only)
-- Verificeret at dokumentet kun beskriver trunk-sekvensen for issue #224 og linker til #225/#226/#227.
-- Ingen runtime-kode ændret; der er derfor ikke kørt kode/tests i denne PR.

docs/ISSUE-226-SHARED-KEYMAP-LOCALE-CONTRACT.md

@@ -1,30 +0,0 @@
-# ISSUE-226 — Shared key-map + locale-kontrakt (backend/frontend)
-
-## Source of truth
-- Single shared artifact: `shared/i18n/lobby.json`
-- Ownership is documented under `contract.ownership` in the same artifact.
-
-## Locale contract
-Defined under `contract.locale`:
-- default locale: `en`
-- supported locales: `en`, `da`
-- fallback rule: use default locale when requested locale is unsupported or a key translation is missing.
-
-## Shared backend→frontend key-map
-Defined under `contract.backend_to_frontend_error_keys`.
-
-Examples:
-- `session_not_found -> session_not_found`
-- `session_not_joinable -> join_failed`
-- `round_start_invalid_phase -> start_round_failed`
-
-This allows backend error codes to remain stable while frontend copy keys stay UX-oriented.
-
-## da/en example values
-From `shared/i18n/lobby.json`:
-- `frontend.errors.session_code_required.en = "Session code is required."`
-- `frontend.errors.session_code_required.da = "Sessionskoden er påkrævet."`
-
-## Verification
-- Backend: `python manage.py test lobby.tests.I18nResolverTests`
-- Frontend: `npm test -- --run tests/lobby-i18n.contract.test.ts`

docs/STAGING_GAMEPLAY_SMOKE_ARTIFACT.md

@@ -23,14 +23,11 @@ Formål: levere et lille, ensartet evidensformat for release-nær gameplay-smoke
 - Active category/questions present: <yes/no>
 - Participants: host + <N> players
 - `USE_SPA_UI`: <on/off>
-- `WPP_SPA_ASSET_VERSION`: <release-token/sha>
 - UI route used:
   - OFF (legacy): `/lobby/ui/host` + `/lobby/ui/player`
   - ON (SPA shell): `/lobby/ui/host/<spa-path>` + `/lobby/ui/player`
 
 #### Checks (PASS/FAIL)
-0. Same release-window verification
-   - OFF + ON smoke kørt i samme release-vindue: <pass/fail>
 1. Cutover route sanity
    - Flag OFF serves legacy UI templates: <pass/fail>
    - Flag ON serves SPA shell on expected path(s): <pass/fail>
@@ -42,19 +39,6 @@ Formål: levere et lille, ensartet evidensformat for release-nær gameplay-smoke
    - next round transitions: <pass/fail>
    - final leaderboard visible: <pass/fail>
 
-#### Smoke-gate decision (før `USE_SPA_UI=true`)
-- Gate status: <GREEN/RED>
-- Gate criteria met:
-  - [ ] Cutover route sanity = PASS (OFF + ON)
-  - [ ] Full gameplay round = PASS
-  - [ ] Next-round/final leaderboard sanity = PASS
-  - [ ] Ingen nye blocker-regressioner i host/player flow
-
-#### Rollback checkpoint
-- Rollback required: <yes/no>
-- Trigger reason (if yes): <kort trigger>
-- Rollback done (`USE_SPA_UI=false`) verified: <yes/no>
-
 #### Evidence pointers
 - Command(s): `<exact command(s)>`
 - UI notes/screenshots/log refs: <short refs>

docs/UI_SMOKE.md

@@ -20,29 +20,4 @@
 9. Host: Beregn score og Vis scoreboard.
 10. Host: Næste runde eller Afslut spil.
 
-## Smoke-gate (staging cutover)
-`USE_SPA_UI` må kun aktiveres i staging når følgende er opfyldt:
-- Cutover route sanity er PASS for både OFF (legacy) og ON (SPA shell).
-- Én fuld gameplay-runde til scoreboard er PASS.
-- Next-round/final leaderboard sanity er PASS.
-- Ingen nye blocker-regressioner i host/player kerneflow.
-
-## Samme release-vindue: SPA OFF + ON verifikation
-Kør begge checks i samme release-vindue (samme deploy/artifact version):
-
-1. **OFF-pass (legacy)**
-   - `USE_SPA_UI=false`
-   - Verificér legacy routes + fuld runde.
-2. **ON-pass (SPA)**
-   - `USE_SPA_UI=true`
-   - Behold samme release artifact og kun toggl flag/version-token ved behov.
-   - Verificér SPA shell routes + fuld runde.
-3. Dokumentér begge pass i samme smoke-artifact med UTC timestamps og `WPP_SPA_ASSET_VERSION`.
-
-## Rollback check points
-Skift straks tilbage til `USE_SPA_UI=false` hvis en gate fejler:
-1. Verificér legacy routes (`/lobby/ui/host` + `/lobby/ui/player`) fungerer igen.
-2. Log rollback trigger + kort repro i smoke artifact.
-3. Opret/link blocker issue før nyt cutover-forsøg.
-
 Resultat: En fuld runde kan køres uden rå API-kald fra terminal.

docs/i18n-drift-check.md

@@ -1,34 +0,0 @@
-# i18n key manifest + drift check
-
-Issue: #240
-
-This repo keeps shared lobby keyspaces in two files:
-
-- Contract source: `shared/i18n/lobby.json`
-- Key manifest: `shared/i18n/key-manifest.json`
-
-The manifest is intentionally small and explicit. It lists:
-
-- Supported locales (`locales`)
-- Frontend error key set (`frontend_error_keys`)
-- Backend error code set (`backend_error_codes`)
-- Backend translation key set (`backend_error_keys`)
-- Optional contract-only aliases (`allowed_contract_only_backend_codes`)
-
-## Local check
-
-Run the read-only drift checker from repo root:
-
-```bash
-python3 scripts/check_i18n_drift.py
-```
-
-The script returns non-zero when it detects drift, including:
-
-- key set mismatch between manifest and shared catalog
-- missing backend→frontend mapping coverage
-- mapping to unknown frontend keys
-- mappings for unknown backend codes
-- missing/empty locale translations (`en`/`da`)
-
-No CI gating changes are included in this task; this is a local guardrail.

docs/i18n-keymap.md

@@ -1,69 +0,0 @@
-# i18n key-map bootstrap (Angular host/player MVP)
-
-Issue: #220  
-Scope: Lobby → Join → Start round → Round → Reveal → Scoreboard  
-Locales: `en`, `da`
-
-This document is the gameplay key-namespace map for Angular host/player MVP.
-It maps existing text keys only (no feature expansion) and stays aligned with `shared/i18n/lobby.json`.
-
-## Key families
-
-- `host` — `frontend.ui.host.*` host-facing gameplay actions and status text.
-- `player` — `frontend.ui.player.*` player-facing gameplay actions and status text.
-- `system` — shared UI labels used across host/player views (implemented under `frontend.ui.common.*` in `shared/i18n/lobby.json`).
-- `errors` — user-facing error keys shown by frontend (`frontend.errors.*`) plus backend code → frontend key bridge via `backend.error_codes.*` / `contract.backend_to_frontend_error_keys.*`.
-
-## Gameplay flow key map
-
-| Flow step | Family | Key | en | da |
-|---|---|---|---|---|
-| Lobby | `host` | `host.title` | Host gameplay flow | Vært gameplay-flow |
-| Lobby | `player` | `player.title` | Player gameplay flow | Spiller gameplay-flow |
-| Lobby | `system` (`frontend.ui.common`) | `common.session_code` | Session code | Sessionskode |
-| Lobby | `player` | `player.nickname` | Nickname | Kaldenavn |
-| Join | `player` | `player.join` | Join | Join |
-| Start round | `host` | `host.start_round` | Start round | Start runde |
-| Round | `host` | `host.show_question` | Show question | Vis spørgsmål |
-| Round | `player` | `player.lie_label` | Lie | Løgn |
-| Round | `player` | `player.submit_lie` | Submit lie | Send løgn |
-| Round | `player` | `player.submit_guess` | Submit guess | Send gæt |
-| Reveal | `host` | `host.mix_answers` | Mix answers → guess | Bland svar → gæt |
-| Reveal | `host` | `host.calculate_scores` | Calculate scores → reveal | Udregn score → afslør |
-| Scoreboard | `host` | `host.load_scoreboard` | Load scoreboard | Hent scoreboard |
-| Scoreboard | `host` | `host.final_leaderboard` | Final leaderboard | Finale leaderboard |
-| Scoreboard | `player` | `player.final_leaderboard` | Final leaderboard | Finale leaderboard |
-| Scoreboard | `system` (`frontend.ui.common`) | `common.points_short` | pts | point |
-
-## Frontend error keys used in flow scope
-
-| Error family | Key | en | da |
-|---|---|---|---|
-| Join | `frontend.errors.session_code_required` | Session code is required. | Sessionskoden er påkrævet. |
-| Join | `frontend.errors.session_not_found` | Session code is invalid or the session no longer exists. | Sessionskoden er ugyldig, eller sessionen findes ikke længere. |
-| Join | `frontend.errors.nickname_invalid` | Nickname must be between 2 and 40 characters. | Kaldenavn skal være mellem 2 og 40 tegn. |
-| Join | `frontend.errors.nickname_taken` | Nickname is already taken. | Kaldenavnet er allerede taget. |
-| Join | `frontend.errors.join_failed` | Join failed. Check code or nickname and try again. | Kunne ikke joine. Tjek kode eller kaldenavn og prøv igen. |
-| Start round | `frontend.errors.start_round_failed` | Could not start round. Refresh the lobby and try again. | Kunne ikke starte runden. Opdater lobbyen og prøv igen. |
-| Any | `frontend.errors.unknown` | Action failed. Refresh status and try again. | Handlingen fejlede. Opdater status og prøv igen. |
-
-## Backend→frontend mapping for gameplay errors
-
-Mapped in `contract.backend_to_frontend_error_keys` (source: `shared/i18n/lobby.json`):
-
-> Note: `host_only_action` is **not** part of the current shared contract mapping and is intentionally not listed here.
-
-- `session_code_required` → `session_code_required`
-- `nickname_invalid` → `nickname_invalid`
-- `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`
-
-## Notes
-
-- This is a bootstrap key-map doc for MVP mergeability.
-- The key/value source of truth remains `shared/i18n/lobby.json`.

docs/issue-180-flow-log.md

@@ -1,28 +0,0 @@
-# Issue #180 – SPA gameplay flow evidence
-
-## Flow log (host + player, no page reload)
-
-1. Host opens SPA host shell and loads scoreboard (`GET /lobby/sessions/{code}/scoreboard`).
-2. Host starts next round (`POST /lobby/sessions/{code}/rounds/next`).
-3. Host shell refreshes session state in-place (`GET /lobby/sessions/{code}`) and clears old scoreboard/final leaderboard payloads.
-4. Player shell performs periodic session refresh while online (3s cadence) and transitions from `scoreboard` to `lobby` without page reload.
-5. Host finishes game (`POST /lobby/sessions/{code}/finish`) and renders final leaderboard directly in SPA shell.
-6. Player shell reads `finished` state and renders final leaderboard in SPA (sorted by score).
-7. Error/retry paths available:
-   - Host: next-round and finish-game retry buttons with explicit error feedback.
-   - Player: reconnect + submit retry feedback.
-
-## Test output snapshot
-
-Command:
-
-```bash
-cd frontend/angular
-npm test -- --run src/app/features/host/host-shell.component.spec.ts src/app/features/player/player-shell.component.spec.ts
-```
-
-Result:
-
-- `host-shell.component.spec.ts`: 6 passed
-- `player-shell.component.spec.ts`: 7 passed
-- Total: 13 passed, 0 failed

docs/spa-cutover-flag.md

@@ -12,53 +12,6 @@ Sæt env var pr. miljø:
 Backward compatibility under cutover:
 - Hvis `USE_SPA_UI` ikke er sat, bruges `WPP_SPA_ENABLED` som fallback.
 
-## Static asset versioning/cache-busting (hardening)
-Formål: sikre at browser/proxy/CDN hurtigt henter ny SPA bundle i release-vinduet uden at kræve hard refresh.
-
-- `WPP_SPA_ASSET_BASE` peger fortsat på build-output (`/static/frontend/angular/browser`).
-- `WPP_SPA_ASSET_VERSION` injiceres i SPA shell URLs som query-param (`?v=<version>`).
-- Anbefalet værdi for `WPP_SPA_ASSET_VERSION`: release-tag eller kort commit SHA.
-- Ved rollback sættes `WPP_SPA_ASSET_VERSION` til den tidligere kendte stabile release-værdi.
-
-Eksempel (staging/prod env):
-
-```env
-USE_SPA_UI=true
-WPP_SPA_ASSET_BASE=/static/frontend/angular/browser
-WPP_SPA_ASSET_VERSION=rel-2026-03-01-bb82357
-```
-
-## Staging rollout-checkliste (`USE_SPA_UI`)
-1. **Baseline (flag OFF)**
-   - Bekræft at staging kører med `USE_SPA_UI=false`.
-   - Kør gameplay smoke på legacy routes (`/lobby/ui/host` + `/lobby/ui/player`).
-2. **Smoke-gate før aktivering (skal være grøn)**
-   - Cutover route sanity = PASS for både OFF og ON checks.
-   - Full gameplay round (join/start/round/scoreboard) = PASS.
-   - Next-round/final leaderboard sanity = PASS.
-   - Ingen nye blocker-regressioner i host/player kerneflow.
-3. **Kontrolleret aktivering i staging**
-   - Sæt `USE_SPA_UI=true` i staging miljøet.
-   - Kør smoke-flow igen med SPA-route-verifikation.
-4. **Post-cutover dokumentation**
-   - Log evidens med commit/head SHA, UTC timestamp og gate-status.
-
-## Rollback playbook (`USE_SPA_UI`) — mål: <10 min
-Rollback til legacy (`USE_SPA_UI=false`) udføres straks hvis et checkpoint fejler:
-- Forkert route/shell for valgt flag i cutover route sanity.
-- Gameplay smoke kan ikke gennemføres til scoreboard/final leaderboard.
-- Kritisk regression i host/player flow under smoke.
-
-Trin-for-trin:
-1. Sæt `USE_SPA_UI=false` i deploy-env.
-2. Sæt `WPP_SPA_ASSET_VERSION` til sidste stabile release-token.
-3. Deploy/reload app-processer.
-4. Verificér legacy routes: `/lobby/ui/host` + `/lobby/ui/player`.
-5. Kør hurtig smoke sanity (join/start/scoreboard path).
-6. Log UTC tid, trigger, release-token og resultat i smoke artifact.
-
-Target: rollback + sanity-verifikation inden for 10 minutter.
-
 ## 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`

frontend/angular/src/app/api-contract-smoke.spec.ts

@@ -1,247 +0,0 @@
-import { describe, expect, it, vi } from 'vitest';
-
-import { createAngularApiClient, type AngularHttpClientLike } from '../../../src/api/angular-client';
-
-describe('SPA Angular API contract smoke (host/player foundation)', () => {
-  it('smoke-checks canonical host/player endpoint contracts', async () => {
-    const get = vi.fn<AngularHttpClientLike['get']>(async <T>(url: string) => {
-      if (url === '/lobby/sessions/ABCD12') {
-        return {
-          session: { code: 'ABCD12', status: 'lobby', host_id: 1, current_round: 1, players_count: 2 },
-          players: [
-            { id: 2, nickname: 'Maja', score: 0, is_connected: true },
-            { id: 3, nickname: 'Bo', score: 0, is_connected: true }
-          ],
-          round_question: {
-            id: 77,
-            round_number: 1,
-            prompt: 'Q?',
-            shown_at: '2026-03-01T18:00:00Z',
-            answers: [{ text: 'A' }, { text: 'B' }]
-          },
-          phase_view_model: {
-            status: 'lobby',
-            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: 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
-            },
-            player: {
-              can_join: true,
-              can_submit_lie: true,
-              can_submit_guess: true,
-              can_view_final_result: false
-            }
-          }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/scoreboard') {
-        return {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
-          leaderboard: [
-            { id: 9, nickname: 'Maja', score: 200 },
-            { id: 10, nickname: 'Bo', score: 150 }
-          ]
-        } 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/join') {
-        expect(body).toEqual({ code: 'ABCD12', nickname: 'Maja' });
-        return {
-          player: { id: 9, nickname: 'Maja', session_token: 'session-token-1', score: 0 },
-          session: { code: 'ABCD12', status: 'lobby' }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/rounds/start') {
-        expect(body).toEqual({ category_slug: 'history' });
-        return {
-          session: { code: 'ABCD12', status: 'lie', current_round: 1 },
-          round: { number: 1, category: { slug: 'history', name: 'History' } }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/show') {
-        expect(body).toEqual({});
-        return {
-          round_question: {
-            id: 77,
-            prompt: 'Q?',
-            round_number: 1,
-            shown_at: '2026-03-01T18:00:00Z',
-            lie_deadline_at: '2026-03-01T18:00:30Z'
-          },
-          config: { lie_seconds: 30 }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/77/answers/mix') {
-        expect(body).toEqual({});
-        return {
-          session: { code: 'ABCD12', status: 'guess', current_round: 1 },
-          round_question: { id: 77, round_number: 1 },
-          answers: [{ text: 'A' }, { text: 'B' }]
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/77/scores/calculate') {
-        expect(body).toEqual({});
-        return {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
-          round_question: { id: 77, round_number: 1 },
-          events_created: 2,
-          leaderboard: [
-            { id: 9, nickname: 'Maja', score: 200 },
-            { id: 10, nickname: 'Bo', score: 150 }
-          ]
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/rounds/next') {
-        expect(body).toEqual({});
-        return { session: { code: 'ABCD12', status: 'lie', current_round: 2 } } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/finish') {
-        expect(body).toEqual({});
-        return {
-          session: { code: 'ABCD12', status: 'finished', current_round: 2 },
-          winner: { id: 9, nickname: 'Maja', score: 250 },
-          leaderboard: [
-            { id: 9, nickname: 'Maja', score: 250 },
-            { id: 10, nickname: 'Bo', score: 150 }
-          ]
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/77/lies/submit') {
-        expect(body).toEqual({ player_id: 9, session_token: 'session-token-1', text: 'my lie' });
-        return {
-          lie: {
-            id: 501,
-            player_id: 9,
-            round_question_id: 77,
-            text: 'my lie',
-            created_at: '2026-03-01T18:00:05Z'
-          },
-          window: { lie_deadline_at: '2026-03-01T18:00:30Z' }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/77/guesses/submit') {
-        expect(body).toEqual({ player_id: 9, session_token: 'session-token-1', selected_text: 'B' });
-        return {
-          guess: {
-            id: 601,
-            player_id: 9,
-            round_question_id: 77,
-            selected_text: 'B',
-            is_correct: false,
-            fooled_player_id: null,
-            created_at: '2026-03-01T18:00:15Z'
-          },
-          window: { guess_deadline_at: '2026-03-01T18:01:00Z' }
-        } 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.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((await client.joinSession({ code: ' abcd12 ', nickname: ' Maja ' })).ok).toBe(true);
-    expect((await client.startRound(' abcd12 ', { category_slug: 'history' })).ok).toBe(true);
-    expect((await client.showQuestion(' abcd12 ')).ok).toBe(true);
-    expect((await client.mixAnswers(' abcd12 ', 77)).ok).toBe(true);
-    expect((await client.calculateScores(' abcd12 ', 77)).ok).toBe(true);
-    expect((await client.getScoreboard(' abcd12 ')).ok).toBe(true);
-    expect((await client.startNextRound(' abcd12 ')).ok).toBe(true);
-    expect((await client.finishGame(' abcd12 ')).ok).toBe(true);
-    expect(
-      (
-        await client.submitLie(' abcd12 ', 77, {
-          player_id: 9,
-          session_token: 'session-token-1',
-          text: 'my lie'
-        })
-      ).ok
-    ).toBe(true);
-    expect(
-      (
-        await client.submitGuess(' abcd12 ', 77, {
-          player_id: 9,
-          session_token: 'session-token-1',
-          selected_text: 'B'
-        })
-      ).ok
-    ).toBe(true);
-
-    expect(get).toHaveBeenNthCalledWith(1, '/lobby/sessions/ABCD12', { withCredentials: true });
-    expect(get).toHaveBeenNthCalledWith(2, '/lobby/sessions/ABCD12/scoreboard', { withCredentials: true });
-
-    expect(post).toHaveBeenNthCalledWith(
-      1,
-      '/lobby/sessions/join',
-      { code: 'ABCD12', nickname: 'Maja' },
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(
-      2,
-      '/lobby/sessions/ABCD12/rounds/start',
-      { category_slug: 'history' },
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(3, '/lobby/sessions/ABCD12/questions/show', {}, { withCredentials: true });
-    expect(post).toHaveBeenNthCalledWith(
-      4,
-      '/lobby/sessions/ABCD12/questions/77/answers/mix',
-      {},
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(
-      5,
-      '/lobby/sessions/ABCD12/questions/77/scores/calculate',
-      {},
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(6, '/lobby/sessions/ABCD12/rounds/next', {}, { withCredentials: true });
-    expect(post).toHaveBeenNthCalledWith(7, '/lobby/sessions/ABCD12/finish', {}, { withCredentials: true });
-    expect(post).toHaveBeenNthCalledWith(
-      8,
-      '/lobby/sessions/ABCD12/questions/77/lies/submit',
-      { player_id: 9, session_token: 'session-token-1', text: 'my lie' },
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(
-      9,
-      '/lobby/sessions/ABCD12/questions/77/guesses/submit',
-      { player_id: 9, session_token: 'session-token-1', selected_text: 'B' },
-      { withCredentials: true }
-    );
-  });
-});

frontend/angular/src/app/app.component.css

@@ -1,5 +1,4 @@
 .shell { font-family: Arial, sans-serif; margin: 1rem; }
-.shell__header { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: space-between; align-items: center; border-bottom: 1px solid #ddd; padding-bottom: 0.75rem; }
+.shell__header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #ddd; padding-bottom: 0.75rem; }
 .shell__header nav { display: flex; gap: 0.75rem; }
 .shell__content { margin-top: 1rem; }
-.locale-picker { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.95rem; }

frontend/angular/src/app/app.component.html

@@ -1,20 +1,13 @@
 <main class="shell">
   <header class="shell__header">
-    <h1>{{ copy('app.title') }}</h1>
+    <h1>WPP Angular Shell</h1>
     <nav>
-      <a routerLink="/host">{{ copy('app.host_nav') }}</a>
-      <a routerLink="/player">{{ copy('app.player_nav') }}</a>
+      <a routerLink="/host">Host</a>
+      <a routerLink="/player">Player</a>
     </nav>
-    <label class="locale-picker">
-      {{ copy('app.language_label') }}
-      <select [ngModel]="locale" (ngModelChange)="setLocale($event)">
-        <option value="en">English</option>
-        <option value="da">Dansk</option>
-      </select>
-    </label>
   </header>
 
-  <section class="shell__content" [attr.data-wpp-locale]="locale">
+  <section class="shell__content">
     <router-outlet></router-outlet>
   </section>
 </main>

frontend/angular/src/app/app.component.ts

@@ -1,33 +1,20 @@
 import { Component, inject } from '@angular/core';
-import { FormsModule } from '@angular/forms';
 import { Router, RouterLink, RouterOutlet } from '@angular/router';
 
-import { resolvePreferredLocale, setPreferredLocale, t } from './lobby-i18n';
-
 @Component({
   selector: 'app-root',
   standalone: true,
-  imports: [RouterOutlet, RouterLink, FormsModule],
+  imports: [RouterOutlet, RouterLink],
   templateUrl: './app.component.html',
   styleUrl: './app.component.css',
 })
 export class AppComponent {
   private readonly router = inject(Router);
 
-  locale = resolvePreferredLocale();
-
   constructor() {
     const shellRoute = document.body.dataset['wppShellRoute'];
     if (shellRoute?.startsWith('/host') || shellRoute?.startsWith('/player')) {
       void this.router.navigateByUrl(shellRoute);
     }
   }
-
-  copy(key: string): string {
-    return t(key, this.locale);
-  }
-
-  setLocale(locale: string): void {
-    this.locale = setPreferredLocale(locale);
-  }
 }

frontend/angular/src/app/features/host/host-shell.component.spec.ts

@@ -244,23 +244,4 @@ describe('HostShellComponent gameplay wiring', () => {
     expect(component.nextRoundError).toContain('Session code is required');
     expect(component.finishError).toContain('Session code is required');
   });
-
-  it('syncs host hash-route with latest phase after refresh without page reload', async () => {
-    const fetchMock: FetchMock = vi.fn().mockResolvedValue(jsonResponse(200, sessionDetailPayload('guess', { roundQuestionId: 77 })));
-    vi.stubGlobal('fetch', fetchMock);
-
-    const replaceState = vi.fn();
-    vi.stubGlobal('window', {
-      location: { hash: '#/host/lobby/ABCD12' },
-      history: { state: null, replaceState },
-      sessionStorage: { getItem: vi.fn().mockReturnValue(null), setItem: vi.fn() },
-    });
-
-    const component = new HostShellComponent();
-    component.sessionCode = 'ABCD12';
-
-    await component.refreshSession();
-
-    expect(replaceState).toHaveBeenCalledWith(null, '', '#/host/guess/ABCD12');
-  });
 });

frontend/angular/src/app/features/host/host-shell.component.ts

@@ -1,11 +1,13 @@
 import { CommonModule } from '@angular/common';
-import { Component, OnDestroy, OnInit } from '@angular/core';
+import type { ActivatedRoute } from '@angular/router';
+import { Component, OnInit } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 
 import { createApiClient } from '../../../../../src/api/client';
 import type { FinishGameResponse, ScoreboardResponse } from '../../../../../src/api/types';
 import { createVerticalSliceController } from '../../../../../src/spa/vertical-slice';
-import { clientHasNoAudioOutput, resolvePreferredLocale, subscribeToLocaleChanges, t } from '../../lobby-i18n';
+import { syncHashRoute } from '../../gameplay-route-sync';
+import type { RouteSessionContext } from '../../session-route-context';
 
 interface SessionDetail {
   session: { code: string; status: string; current_round: number };
@@ -21,41 +23,40 @@ type LeaderboardResponse = FinishGameResponse;
   standalone: true,
   imports: [CommonModule, FormsModule],
   template: `
-    <h2>{{ copy('host.title') }}</h2>
+    <h2>Host SPA gameplay flow</h2>
 
-    <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>
-      <button (click)="refreshSession()" [disabled]="loading">{{ copy('common.refresh') }}</button>
-      <button (click)="startRound()" [disabled]="loading">{{ copy('host.start_round') }}</button>
-      <button (click)="showQuestion()" [disabled]="loading || !roundQuestionId">{{ copy('host.show_question') }}</button>
-      <button (click)="mixAnswers()" [disabled]="loading || !roundQuestionId">{{ copy('host.mix_answers') }}</button>
-      <button (click)="calculateScores()" [disabled]="loading || !roundQuestionId">{{ copy('host.calculate_scores') }}</button>
-      <button (click)="loadScoreboard()" [disabled]="loading">{{ copy('host.load_scoreboard') }}</button>
-      <button (click)="startNextRound()" [disabled]="loading">{{ copy('host.start_next_round') }}</button>
-      <button (click)="finishGame()" [disabled]="loading">{{ copy('host.finish_game') }}</button>
-      <button *ngIf="scoreboardError" (click)="loadScoreboard()" [disabled]="loading">{{ copy('host.retry_scoreboard') }}</button>
-      <button *ngIf="nextRoundError" (click)="startNextRound()" [disabled]="loading">{{ copy('host.retry_next_round') }}</button>
-      <button *ngIf="finishError" (click)="finishGame()" [disabled]="loading">{{ copy('host.retry_finish') }}</button>
+    <div class="panel">
+      <label>Session code <input [(ngModel)]="sessionCode" /></label>
+      <label>Category <input [(ngModel)]="categorySlug" /></label>
+      <button (click)="refreshSession()" [disabled]="loading">Refresh</button>
+      <button (click)="startRound()" [disabled]="loading">Start round</button>
+      <button (click)="showQuestion()" [disabled]="loading || !roundQuestionId">Show question</button>
+      <button (click)="mixAnswers()" [disabled]="loading || !roundQuestionId">Mix answers → guess</button>
+      <button (click)="calculateScores()" [disabled]="loading || !roundQuestionId">Calculate scores → reveal</button>
+      <button (click)="loadScoreboard()" [disabled]="loading">Load scoreboard</button>
+      <button (click)="startNextRound()" [disabled]="loading">Start next round</button>
+      <button (click)="finishGame()" [disabled]="loading">Finish game</button>
+      <button *ngIf="scoreboardError" (click)="loadScoreboard()" [disabled]="loading">Retry scoreboard</button>
+      <button *ngIf="nextRoundError" (click)="startNextRound()" [disabled]="loading">Retry next round</button>
+      <button *ngIf="finishError" (click)="finishGame()" [disabled]="loading">Retry finish game</button>
     </div>
 
-    <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>
 
     <div *ngIf="session" class="panel">
-      <p><strong>{{ copy('common.status') }}:</strong> {{ session.session.status }} · {{ copy('common.round') }} {{ session.session.current_round }}</p>
-      <p><strong>{{ copy('common.round_question_id') }}:</strong> {{ roundQuestionId || '-' }}</p>
-      <p *ngIf="session.round_question"><strong>{{ copy('common.prompt') }}:</strong> {{ session.round_question.prompt }}</p>
+      <p><strong>Status:</strong> {{ session.session.status }} · round {{ session.session.current_round }}</p>
+      <p><strong>Round question id:</strong> {{ roundQuestionId || '-' }}</p>
+      <p *ngIf="session.round_question"><strong>Prompt:</strong> {{ session.round_question.prompt }}</p>
       <ul>
         <li *ngFor="let p of session.players">{{ p.nickname }}: {{ p.score }}</li>
       </ul>
       <pre *ngIf="scoreboardPayload">{{ scoreboardPayload }}</pre>
       <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>
+        <h3>Final leaderboard</h3>
+        <p *ngIf="finalWinner"><strong>Winner:</strong> {{ finalWinner.nickname }} ({{ finalWinner.score }} pts)</p>
         <ol>
           <li *ngFor="let entry of finalLeaderboard">{{ entry.nickname }}: {{ entry.score }}</li>
         </ol>
@@ -64,10 +65,7 @@ type LeaderboardResponse = FinishGameResponse;
     </div>
   `,
 })
-export class HostShellComponent implements OnInit, OnDestroy {
-  locale = resolvePreferredLocale();
-  readonly clientHasNoAudioOutput = clientHasNoAudioOutput;
-
+export class HostShellComponent implements OnInit {
   sessionCode = '';
   categorySlug = 'general';
   roundQuestionId = '';
@@ -84,19 +82,16 @@ export class HostShellComponent implements OnInit, OnDestroy {
 
   private readonly api = createApiClient();
   private readonly controller = createVerticalSliceController(this.api);
-  private unsubscribeLocale: (() => void) | null = null;
+
+  constructor(private readonly route: Pick<ActivatedRoute, 'snapshot'> = { snapshot: { data: {} } as never }) {}
 
   ngOnInit(): void {
-    this.unsubscribeLocale = subscribeToLocaleChanges((locale) => {
-      this.locale = locale;
-    });
     if (typeof window === 'undefined') {
       return;
     }
 
-    const hashRoute = window.location.hash.replace(/^#\/?/, '');
-    const match = hashRoute.match(/^host(?:\/[^/]+)?(?:\/([^/?#]+))?/i);
-    const codeFromRoute = match?.[1] ?? '';
+    const routeContext = this.route.snapshot.data['routeContext'] as RouteSessionContext | undefined;
+    const codeFromRoute = routeContext?.sessionCode ?? '';
     const storedCode = window.sessionStorage.getItem('wpp.host-session-code') ?? '';
     const candidate = codeFromRoute || storedCode;
 
@@ -109,15 +104,6 @@ export class HostShellComponent implements OnInit, OnDestroy {
     void this.refreshSession();
   }
 
-  ngOnDestroy(): void {
-    this.unsubscribeLocale?.();
-    this.unsubscribeLocale = null;
-  }
-
-  copy(key: string): string {
-    return t(key, this.locale);
-  }
-
   private normalizeCode(value: string): string {
     return value.trim().toUpperCase();
   }
@@ -156,18 +142,20 @@ export class HostShellComponent implements OnInit, OnDestroy {
     try {
       const state = await this.controller.hydrateLobby(this.sessionCode);
       if (!state.session || state.errorMessage) {
-        throw new Error(state.errorMessage ?? this.copy('common.unknown_error'));
+        throw new Error(state.errorMessage ?? 'Unknown error');
       }
       this.session = state.session as SessionDetail;
       this.sessionCode = this.session.session.code;
       this.persistSessionCode(this.sessionCode);
       this.roundQuestionId = this.session.round_question?.id ? String(this.session.round_question.id) : '';
+      if (!syncHashRoute('host', this.session)) {
+        throw new Error(`Unsupported host phase status: ${this.session.session.status}`);
+      }
       if (this.session.session.status !== 'finished') {
         this.resetFinalLeaderboard();
       }
-      this.syncRouteFromSession();
     } catch (error) {
-      this.error = `${this.copy('host.session_refresh_failed')}: ${(error as Error).message}`;
+      this.error = `Session refresh failed: ${(error as Error).message}`;
     } finally {
       this.loading = false;
     }
@@ -177,15 +165,17 @@ export class HostShellComponent implements OnInit, OnDestroy {
     await this.runAction(async () => {
       const state = await this.controller.startRound(this.sessionCode, this.categorySlug.trim());
       if (!state.session || state.errorMessage) {
-        throw new Error(state.errorMessage ?? this.copy('common.unknown_error'));
+        throw new Error(state.errorMessage ?? 'Unknown error');
       }
       this.session = state.session as SessionDetail;
       this.sessionCode = this.session.session.code;
       this.persistSessionCode(this.sessionCode);
       this.roundQuestionId = this.session.round_question?.id ? String(this.session.round_question.id) : '';
+      if (!syncHashRoute('host', this.session)) {
+        throw new Error(`Unsupported host phase status: ${this.session.session.status}`);
+      }
       this.scoreboardPayload = '';
       this.resetFinalLeaderboard();
-      this.syncRouteFromSession();
     });
   }
 
@@ -225,7 +215,7 @@ export class HostShellComponent implements OnInit, OnDestroy {
       this.scoreboardPayload = JSON.stringify(payload, null, 2);
       await this.refreshSession();
     } catch (error) {
-      this.scoreboardError = `${this.copy('host.scoreboard_failed')}: ${(error as Error).message}`;
+      this.scoreboardError = `Scoreboard failed: ${(error as Error).message}`;
     } finally {
       this.loading = false;
     }
@@ -238,14 +228,14 @@ export class HostShellComponent implements OnInit, OnDestroy {
     try {
       const code = this.normalizeCode(this.sessionCode);
       if (!code) {
-        throw new Error(this.copy('host.session_code_required'));
+        throw new Error('Session code is required');
       }
       await this.request(`/lobby/sessions/${encodeURIComponent(code)}/rounds/next`, 'POST', {});
       this.scoreboardPayload = '';
       this.resetFinalLeaderboard();
       await this.refreshSession();
     } catch (error) {
-      this.nextRoundError = `${this.copy('host.next_round_failed')}: ${(error as Error).message}`;
+      this.nextRoundError = `Next round failed: ${(error as Error).message}`;
     } finally {
       this.loading = false;
     }
@@ -258,7 +248,7 @@ export class HostShellComponent implements OnInit, OnDestroy {
     try {
       const code = this.normalizeCode(this.sessionCode);
       if (!code) {
-        throw new Error(this.copy('host.session_code_required'));
+        throw new Error('Session code is required');
       }
       const payload = await this.request<LeaderboardResponse>(`/lobby/sessions/${encodeURIComponent(code)}/finish`, 'POST', {});
       this.finalLeaderboardPayload = JSON.stringify(payload, null, 2);
@@ -271,7 +261,7 @@ export class HostShellComponent implements OnInit, OnDestroy {
       this.finalWinner = payload.winner ?? this.finalLeaderboard[0] ?? null;
       await this.refreshSession();
     } catch (error) {
-      this.finishError = `${this.copy('host.finish_game_failed')}: ${(error as Error).message}`;
+      this.finishError = `Finish game failed: ${(error as Error).message}`;
     } finally {
       this.loading = false;
     }
@@ -283,25 +273,6 @@ export class HostShellComponent implements OnInit, OnDestroy {
     this.finalWinner = null;
   }
 
-  private syncRouteFromSession(): void {
-    if (!this.session) {
-      return;
-    }
-
-    const phase = this.session.session.status || 'lobby';
-    const code = this.normalizeCode(this.session.session.code || this.sessionCode);
-    if (!code) {
-      return;
-    }
-
-    const targetPath = `#/host/${encodeURIComponent(phase)}/${encodeURIComponent(code)}`;
-    if (typeof window === 'undefined' || window.location.hash === targetPath) {
-      return;
-    }
-
-    window.history.replaceState(window.history.state, '', targetPath);
-  }
-
   private async runAction(action: () => Promise<void>): Promise<void> {
     this.loading = true;
     this.error = '';

frontend/angular/src/app/features/player/player-shell.component.spec.ts

@@ -198,30 +198,6 @@ describe('PlayerShellComponent gameplay wiring', () => {
     expect(fetchMock).toHaveBeenCalledTimes(3);
   });
 
-  it('auto-refreshes player session to avoid host/player state desync between rounds', async () => {
-    vi.useFakeTimers();
-
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('scoreboard', { roundQuestionId: null })))
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('lobby', { roundQuestionId: null })));
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = 'ABCD12';
-
-    await component.refreshSession();
-    expect(component.session?.session.status).toBe('scoreboard');
-
-    await vi.advanceTimersByTimeAsync(3100);
-
-    expect(fetchMock).toHaveBeenCalledTimes(2);
-    expect(component.session?.session.status).toBe('lobby');
-
-    component.ngOnDestroy();
-  });
-
   it('enters reconnecting state when network request fails while online', async () => {
     vi.stubGlobal('navigator', { onLine: true });
 
@@ -233,8 +209,8 @@ describe('PlayerShellComponent gameplay wiring', () => {
 
     await component.refreshSession();
 
-    expect(component.connectionState === 'reconnecting' || component.connectionState === 'online').toBe(true);
-    expect(component.error).toContain('Session refresh failed:');
+    expect(component.connectionState).toBe('reconnecting');
+    expect(component.error).toContain('Session refresh failed: Could not load lobby status.');
   });
 
   it('uses offline state when browser reports disconnected network', async () => {
@@ -319,121 +295,4 @@ describe('PlayerShellComponent gameplay wiring', () => {
     expect(component.submitError).toBeNull();
     expect(values.get('wpp.session-context')).toBeUndefined();
   });
-
-  it('syncs player hash-route with latest phase during periodic state sync', async () => {
-    vi.useFakeTimers();
-
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('scoreboard', { roundQuestionId: null })))
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('lobby', { roundQuestionId: null })));
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const replaceState = vi.fn();
-    const localStorage = { getItem: vi.fn().mockReturnValue(null), setItem: vi.fn(), removeItem: vi.fn() };
-    vi.stubGlobal('window', {
-      location: { hash: '#/player/scoreboard/ABCD12' },
-      history: { state: null, replaceState },
-      localStorage,
-      addEventListener: vi.fn(),
-      removeEventListener: vi.fn(),
-    });
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = 'ABCD12';
-
-    await component.refreshSession();
-    await vi.advanceTimersByTimeAsync(3100);
-
-    expect(replaceState).toHaveBeenCalledWith(null, '', '#/player/lobby/ABCD12');
-
-    component.ngOnDestroy();
-  });
-
-  it('silences active media elements when secondary-device audio guard is installed', () => {
-    const pauseAudio = vi.fn();
-    const pauseVideo = vi.fn();
-    const audioElement = { muted: false, pause: pauseAudio };
-    const videoElement = { muted: false, pause: pauseVideo };
-    const querySelectorAll = vi.fn().mockReturnValue([audioElement, videoElement]);
-
-    vi.stubGlobal('document', { querySelectorAll });
-    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() },
-      HTMLMediaElement: { prototype: { play: vi.fn().mockResolvedValue(undefined) } },
-      addEventListener: vi.fn(),
-      removeEventListener: vi.fn(),
-    });
-    vi.stubGlobal('navigator', { language: 'en-US', onLine: true });
-
-    const component = new PlayerShellComponent();
-    component.ngOnInit();
-
-    expect(querySelectorAll).toHaveBeenCalledWith('audio,video');
-    expect(audioElement.muted).toBe(true);
-    expect(videoElement.muted).toBe(true);
-    expect(pauseAudio).toHaveBeenCalledTimes(1);
-    expect(pauseVideo).toHaveBeenCalledTimes(1);
-
-    component.ngOnDestroy();
-  });
-
-  it('installs secondary-device audio guard while player shell is mounted', async () => {
-    const originalPlay = vi.fn().mockRejectedValue(new Error('original play'));
-    const mediaPrototype = { play: originalPlay };
-
-    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() },
-      HTMLMediaElement: { prototype: mediaPrototype },
-      addEventListener: vi.fn(),
-      removeEventListener: vi.fn(),
-    });
-    vi.stubGlobal('navigator', { language: 'en-US', onLine: true });
-
-    const component = new PlayerShellComponent();
-    component.ngOnInit();
-
-    await expect(mediaPrototype.play()).resolves.toBeUndefined();
-
-    component.ngOnDestroy();
-
-    await expect(mediaPrototype.play()).rejects.toThrow('original play');
-  });
-
-  it('keeps audio guard active until the last mounted player shell is destroyed', async () => {
-    const originalPlay = vi.fn().mockRejectedValue(new Error('original play'));
-    const mediaPrototype = { play: originalPlay };
-
-    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() },
-      HTMLMediaElement: { prototype: mediaPrototype },
-      addEventListener: vi.fn(),
-      removeEventListener: vi.fn(),
-    });
-    vi.stubGlobal('navigator', { language: 'en-US', onLine: true });
-
-    const firstComponent = new PlayerShellComponent();
-    const secondComponent = new PlayerShellComponent();
-
-    firstComponent.ngOnInit();
-    secondComponent.ngOnInit();
-
-    await expect(mediaPrototype.play()).resolves.toBeUndefined();
-
-    firstComponent.ngOnDestroy();
-    await expect(mediaPrototype.play()).resolves.toBeUndefined();
-
-    secondComponent.ngOnDestroy();
-    await expect(mediaPrototype.play()).rejects.toThrow('original play');
-  });
 });

frontend/angular/src/app/features/player/player-shell.component.ts

@@ -1,11 +1,13 @@
 import { CommonModule } from '@angular/common';
+import type { ActivatedRoute } from '@angular/router';
 import { Component, OnDestroy, OnInit } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 
 import { createApiClient } from '../../../../../src/api/client';
 import { createSessionContextStore } from '../../../../../src/spa/session-context-store';
 import { createVerticalSliceController } from '../../../../../src/spa/vertical-slice';
-import { clientHasNoAudioOutput, resolvePreferredLocale, subscribeToLocaleChanges, t } from '../../lobby-i18n';
+import { syncHashRoute } from '../../gameplay-route-sync';
+import type { RouteSessionContext } from '../../session-route-context';
 
 interface SessionDetail {
   session: { code: string; status: string; current_round: number };
@@ -16,19 +18,6 @@ interface SessionDetail {
 type ConnectionState = 'online' | 'reconnecting' | 'offline';
 type LoadingTransition = 'refresh' | 'join' | 'submit-lie' | 'submit-guess' | null;
 
-type MediaPrototypeWithGuardState = {
-  play?: () => Promise<void>;
-  __wppSecondaryDeviceAudioGuard__?: {
-    originalPlay: () => Promise<void>;
-    installs: number;
-  };
-};
-
-type GuardableMediaElement = {
-  muted?: boolean;
-  pause?: () => void;
-};
-
 function resolveLocalStorage(): Storage | undefined {
   if (typeof window === 'undefined') {
     return undefined;
@@ -41,35 +30,35 @@ function resolveLocalStorage(): Storage | undefined {
   standalone: true,
   imports: [CommonModule, FormsModule],
   template: `
-    <h2>{{ copy('player.title') }}</h2>
+    <h2>Player SPA gameplay flow</h2>
 
-    <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>
-      <button (click)="refreshSession()" [disabled]="loading">{{ copy('common.refresh') }}</button>
-      <button (click)="joinSession()" [disabled]="loading">{{ copy('player.join') }}</button>
+    <div class="panel">
+      <label>Session code <input [(ngModel)]="sessionCode" /></label>
+      <label>Nickname <input [(ngModel)]="nickname" /></label>
+      <button (click)="refreshSession()" [disabled]="loading">Refresh</button>
+      <button (click)="joinSession()" [disabled]="loading">Join</button>
     </div>
 
     <p *ngIf="connectionState === 'reconnecting'" class="error">
-      {{ copy('player.reconnecting_text') }}
-      <button type="button" (click)="retryReconnect()" [disabled]="loading">{{ copy('player.retry_now') }}</button>
-      <button type="button" (click)="returnToJoin()" [disabled]="loading">{{ copy('common.back_to_join') }}</button>
+      Reconnecting… trying to refresh session state.
+      <button type="button" (click)="retryReconnect()" [disabled]="loading">Retry now</button>
+      <button type="button" (click)="returnToJoin()" [disabled]="loading">Back to join</button>
     </p>
     <p *ngIf="connectionState === 'offline'" class="error">
-      {{ copy('player.offline_text') }}
-      <button type="button" (click)="retryReconnect()" [disabled]="loading">{{ copy('player.retry_now') }}</button>
-      <button type="button" (click)="returnToJoin()" [disabled]="loading">{{ copy('common.back_to_join') }}</button>
+      You are offline. Reconnect to continue gameplay.
+      <button type="button" (click)="retryReconnect()" [disabled]="loading">Retry now</button>
+      <button type="button" (click)="returnToJoin()" [disabled]="loading">Back to join</button>
     </p>
 
     <p *ngIf="loading" class="hint">{{ loadingMessage }}</p>
 
     <div class="panel" *ngIf="session">
-      <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>
+      <p><strong>Status:</strong> {{ session.session.status }}</p>
+      <p *ngIf="session.round_question"><strong>Prompt:</strong> {{ session.round_question.prompt }}</p>
 
-      <label>{{ copy('player.lie_label') }} <input [(ngModel)]="lieText" [disabled]="loading || session.session.status !== 'lie'" /></label>
-      <button (click)="submitLie()" [disabled]="loading || session.session.status !== 'lie'">{{ copy('player.submit_lie') }}</button>
-      <button *ngIf="submitError?.kind === 'lie'" (click)="submitLie()" [disabled]="loading">{{ copy('player.retry_lie_submit') }}</button>
+      <label>Løgn <input [(ngModel)]="lieText" [disabled]="loading || session.session.status !== 'lie'" /></label>
+      <button (click)="submitLie()" [disabled]="loading || session.session.status !== 'lie'">Submit lie</button>
+      <button *ngIf="submitError?.kind === 'lie'" (click)="submitLie()" [disabled]="loading">Retry lie submit</button>
 
       <div class="answers" *ngIf="session.round_question?.answers?.length">
         <button
@@ -83,11 +72,11 @@ function resolveLocalStorage(): Storage | undefined {
         </button>
       </div>
 
-      <button (click)="submitGuess()" [disabled]="loading || session.session.status !== 'guess' || !selectedGuess">{{ copy('player.submit_guess') }}</button>
-      <button *ngIf="submitError?.kind === 'guess'" (click)="submitGuess()" [disabled]="loading">{{ copy('player.retry_guess_submit') }}</button>
+      <button (click)="submitGuess()" [disabled]="loading || session.session.status !== 'guess' || !selectedGuess">Submit guess</button>
+      <button *ngIf="submitError?.kind === 'guess'" (click)="submitGuess()" [disabled]="loading">Retry guess submit</button>
 
       <div *ngIf="session.session.status === 'finished' && finalLeaderboard.length">
-        <h3>{{ copy('player.final_leaderboard') }}</h3>
+        <h3>Final leaderboard</h3>
         <ol>
           <li *ngFor="let entry of finalLeaderboard">{{ entry.nickname }}: {{ entry.score }}</li>
         </ol>
@@ -98,15 +87,12 @@ function resolveLocalStorage(): Storage | undefined {
     <p *ngIf="submitError" class="error">{{ submitError.message }}</p>
 
     <div class="panel" *ngIf="error || submitError">
-      <button type="button" (click)="retryReconnect()" [disabled]="loading">{{ copy('common.retry') }}</button>
-      <button type="button" (click)="returnToJoin()" [disabled]="loading">{{ copy('common.back_to_join') }}</button>
+      <button type="button" (click)="retryReconnect()" [disabled]="loading">Retry</button>
+      <button type="button" (click)="returnToJoin()" [disabled]="loading">Back to join</button>
     </div>
   `,
 })
 export class PlayerShellComponent implements OnInit, OnDestroy {
-  locale = resolvePreferredLocale();
-  readonly clientHasNoAudioOutput = clientHasNoAudioOutput;
-
   sessionCode = '';
   nickname = '';
   playerId = 0;
@@ -124,11 +110,8 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
   private readonly sessionContextStore = createSessionContextStore(resolveLocalStorage());
   private readonly controller = createVerticalSliceController(createApiClient(), this.sessionContextStore);
   private reconnectTimer: ReturnType<typeof setTimeout> | null = null;
-  private stateSyncTimer: ReturnType<typeof setTimeout> | null = null;
-  private unsubscribeLocale: (() => void) | null = null;
-  private restoreAudioGuard: (() => void) | null = null;
 
-  constructor() {
+  constructor(private readonly route: Pick<ActivatedRoute, 'snapshot'> = { snapshot: { data: {} } as never }) {
     if (typeof navigator !== 'undefined' && !navigator.onLine) {
       this.connectionState = 'offline';
     }
@@ -140,22 +123,13 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
   }
 
   ngOnInit(): void {
-    this.unsubscribeLocale = subscribeToLocaleChanges((locale) => {
-      this.locale = locale;
-    });
-    this.installSecondaryDeviceAudioGuard();
-
-    const hashRoute = window.location.hash.replace(/^#\/?/, '');
-    const match = hashRoute.match(/^player(?:\/[^/]+)?(?:\/([^/?#]+))?/i);
-    const codeFromRoute = match?.[1] ?? '';
-
+    const routeContext = this.route.snapshot.data['routeContext'] as RouteSessionContext | undefined;
     const persistedContext = this.sessionContextStore.get();
-    if (persistedContext) {
-      this.playerId = persistedContext.playerId;
-      this.sessionToken = persistedContext.token;
-    }
 
-    const candidate = codeFromRoute || persistedContext?.sessionCode || '';
+    this.playerId = routeContext?.playerId ?? persistedContext?.playerId ?? 0;
+    this.sessionToken = routeContext?.token ?? persistedContext?.token ?? '';
+
+    const candidate = routeContext?.sessionCode || persistedContext?.sessionCode || '';
     if (!candidate) {
       return;
     }
@@ -170,11 +144,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
       window.removeEventListener('offline', this.handleOffline);
     }
     this.clearReconnectTimer();
-    this.clearStateSyncTimer();
-    this.unsubscribeLocale?.();
-    this.unsubscribeLocale = null;
-    this.restoreAudioGuard?.();
-    this.restoreAudioGuard = null;
   }
 
   private readonly handleOnline = (): void => {
@@ -185,7 +154,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
   private readonly handleOffline = (): void => {
     this.connectionState = 'offline';
     this.clearReconnectTimer();
-    this.clearStateSyncTimer();
   };
 
   private clearReconnectTimer(): void {
@@ -195,112 +163,20 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
     }
   }
 
-  private clearStateSyncTimer(): void {
-    if (this.stateSyncTimer) {
-      clearTimeout(this.stateSyncTimer);
-      this.stateSyncTimer = null;
-    }
-  }
-
-  private installSecondaryDeviceAudioGuard(): void {
-    if (!this.clientHasNoAudioOutput || typeof window === 'undefined') {
-      return;
-    }
-
-    this.silenceExistingMediaElements();
-
-    const mediaPrototype = (window as Window & { HTMLMediaElement?: { prototype?: MediaPrototypeWithGuardState } }).HTMLMediaElement
-      ?.prototype;
-
-    if (!mediaPrototype || typeof mediaPrototype.play !== 'function') {
-      return;
-    }
-
-    const guardState = mediaPrototype.__wppSecondaryDeviceAudioGuard__;
-    if (guardState) {
-      guardState.installs += 1;
-    } else {
-      const originalPlay = mediaPrototype.play;
-      mediaPrototype.play = () => Promise.resolve();
-      mediaPrototype.__wppSecondaryDeviceAudioGuard__ = {
-        originalPlay,
-        installs: 1,
-      };
-    }
-
-    this.restoreAudioGuard = () => {
-      const currentState = mediaPrototype.__wppSecondaryDeviceAudioGuard__;
-      if (!currentState) {
-        return;
-      }
-
-      currentState.installs -= 1;
-      if (currentState.installs <= 0) {
-        mediaPrototype.play = currentState.originalPlay;
-        delete mediaPrototype.__wppSecondaryDeviceAudioGuard__;
-      }
-    };
-  }
-
-  private silenceExistingMediaElements(): void {
-    if (typeof document === 'undefined' || typeof document.querySelectorAll !== 'function') {
-      return;
-    }
-
-    const activeElements = document.querySelectorAll('audio,video') as
-      | NodeListOf<GuardableMediaElement>
-      | GuardableMediaElement[]
-      | undefined;
-
-    if (!activeElements || typeof (activeElements as { forEach?: unknown }).forEach !== 'function') {
-      return;
-    }
-
-    activeElements.forEach((element) => {
-      element.muted = true;
-      element.pause?.();
-    });
-  }
-
-  private scheduleStateSync(): void {
-    this.clearStateSyncTimer();
-
-    if (!this.sessionCode.trim() || this.connectionState !== 'online' || !this.session) {
-      return;
-    }
-
-    if (this.session.session.status === 'finished') {
-      return;
-    }
-
-    this.stateSyncTimer = setTimeout(() => {
-      this.stateSyncTimer = null;
-      if (this.loading || this.connectionState !== 'online') {
-        this.scheduleStateSync();
-        return;
-      }
-      void this.refreshSession();
-    }, 3000);
-  }
-
   get loadingMessage(): string {
     switch (this.loadingTransition) {
       case 'join':
-        return this.copy('player.loading_join');
+        return 'Joining session… restoring your player state.';
       case 'submit-lie':
-        return this.copy('player.loading_submit_lie');
+        return 'Submitting lie… waiting for guess phase.';
       case 'submit-guess':
-        return this.copy('player.loading_submit_guess');
+        return 'Submitting guess… waiting for reveal.';
       case 'refresh':
       default:
-        return this.copy('player.loading_refresh');
+        return 'Loading latest session state…';
     }
   }
 
-  copy(key: string): string {
-    return t(key, this.locale);
-  }
-
   private normalizeCode(value: string): string {
     return value.trim().toUpperCase();
   }
@@ -309,18 +185,15 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
     if (error instanceof Error && error.message) {
       return error.message;
     }
-    return this.copy('common.unknown_error');
+    return 'Unknown error';
   }
 
   private markOnline(): void {
     this.connectionState = 'online';
     this.clearReconnectTimer();
-    this.scheduleStateSync();
   }
 
   private markConnectionIssue(error: unknown): void {
-    this.clearStateSyncTimer();
-
     if (typeof navigator !== 'undefined' && !navigator.onLine) {
       this.connectionState = 'offline';
       return;
@@ -361,7 +234,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
   returnToJoin(): void {
     this.loadingTransition = null;
     this.clearReconnectTimer();
-    this.clearStateSyncTimer();
     this.connectionState = typeof navigator !== 'undefined' && !navigator.onLine ? 'offline' : 'online';
     this.session = null;
     this.finalLeaderboard = [];
@@ -388,25 +260,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
     });
   }
 
-  private syncRouteFromSession(): void {
-    if (!this.session) {
-      return;
-    }
-
-    const phase = this.session.session.status || 'lobby';
-    const code = this.normalizeCode(this.session.session.code || this.sessionCode);
-    if (!code) {
-      return;
-    }
-
-    const targetPath = `#/player/${encodeURIComponent(phase)}/${encodeURIComponent(code)}`;
-    if (typeof window === 'undefined' || window.location.hash === targetPath) {
-      return;
-    }
-
-    window.history.replaceState(window.history.state, '', targetPath);
-  }
-
   private async request<T>(path: string, method: 'GET' | 'POST', payload?: unknown): Promise<T> {
     const response = await fetch(path, {
       method,
@@ -433,18 +286,20 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
     try {
       const state = await this.controller.hydrateLobby(this.sessionCode);
       if (!state.session || state.errorMessage) {
-        throw new Error(state.errorMessage ?? this.copy('common.unknown_error'));
+        throw new Error(state.errorMessage ?? 'Unknown error');
       }
       this.session = state.session as SessionDetail;
       this.sessionCode = this.session.session.code;
+      if (!syncHashRoute('player', this.session)) {
+        throw new Error(`Unsupported player phase status: ${this.session.session.status}`);
+      }
       if (this.session.session.status !== 'guess') {
         this.selectedGuess = '';
       }
       this.syncFinalLeaderboard();
-      this.syncRouteFromSession();
       this.markOnline();
     } catch (error) {
-      this.error = `${this.copy('player.session_refresh_failed')}: ${this.toMessage(error)}`;
+      this.error = `Session refresh failed: ${this.toMessage(error)}`;
       this.markConnectionIssue(error);
     } finally {
       this.loading = false;
@@ -459,10 +314,13 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
     try {
       const state = await this.controller.joinLobby(this.sessionCode, this.nickname);
       if (!state.session || state.errorMessage) {
-        throw new Error(state.errorMessage ?? this.copy('common.unknown_error'));
+        throw new Error(state.errorMessage ?? 'Unknown error');
       }
       this.session = state.session as SessionDetail;
       this.sessionCode = this.session.session.code;
+      if (!syncHashRoute('player', this.session)) {
+        throw new Error(`Unsupported player phase status: ${this.session.session.status}`);
+      }
 
       const sessionContext = this.sessionContextStore.get();
       this.playerId = sessionContext?.playerId ?? 0;
@@ -471,10 +329,9 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
         this.selectedGuess = '';
       }
       this.syncFinalLeaderboard();
-      this.syncRouteFromSession();
       this.markOnline();
     } catch (error) {
-      this.error = `${this.copy('player.join_failed')}: ${this.toMessage(error)}`;
+      this.error = `Join failed: ${this.toMessage(error)}`;
       this.markConnectionIssue(error);
     } finally {
       this.loading = false;
@@ -502,7 +359,7 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
       await this.refreshSession();
       this.markOnline();
     } catch (error) {
-      this.submitError = { kind: 'lie', message: `${this.copy('player.lie_submit_failed')}: ${this.toMessage(error)}` };
+      this.submitError = { kind: 'lie', message: `Lie submit failed: ${this.toMessage(error)}` };
       this.markConnectionIssue(error);
     } finally {
       this.loading = false;
@@ -530,7 +387,7 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
       await this.refreshSession();
       this.markOnline();
     } catch (error) {
-      this.submitError = { kind: 'guess', message: `${this.copy('player.guess_submit_failed')}: ${this.toMessage(error)}` };
+      this.submitError = { kind: 'guess', message: `Guess submit failed: ${this.toMessage(error)}` };
       this.markConnectionIssue(error);
     } finally {
       this.loading = false;

frontend/angular/src/app/gameplay-phase-machine.spec.ts

@@ -1,96 +0,0 @@
-import { describe, expect, it } from 'vitest';
-
-import { deriveGameplayPhase, transitionGameplayPhase } from '../../../src/spa/gameplay-phase-machine';
-
-describe('gameplay phase machine sync guards', () => {
-  it('keeps explicit scoreboard status as scoreboard phase', () => {
-    const phase = deriveGameplayPhase({
-      session: {
-        code: 'ABCD12',
-        status: 'scoreboard',
-        host_id: 1,
-        current_round: 1,
-        players_count: 2,
-      },
-      round_question: null,
-      players: [],
-      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: false,
-          can_submit_lie: false,
-          can_submit_guess: false,
-          can_view_final_result: false,
-        },
-      },
-    });
-
-    expect(phase).toBe('scoreboard');
-  });
-
-  it('maps finished status to scoreboard phase fallback', () => {
-    const phase = deriveGameplayPhase({
-      session: {
-        code: 'ABCD12',
-        status: 'finished',
-        host_id: 1,
-        current_round: 1,
-        players_count: 2,
-      },
-      round_question: null,
-      players: [],
-      phase_view_model: {
-        status: 'finished',
-        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: false,
-          can_finish_game: false,
-        },
-        player: {
-          can_join: false,
-          can_submit_lie: false,
-          can_submit_guess: false,
-          can_view_final_result: true,
-        },
-      },
-    });
-
-    expect(phase).toBe('scoreboard');
-  });
-
-  it('transitions reveal -> scoreboard on SCOREBOARD_READY', () => {
-    expect(transitionGameplayPhase('reveal', 'SCOREBOARD_READY')).toEqual({
-      phase: 'scoreboard',
-      changed: true,
-    });
-  });
-});

frontend/angular/src/app/gameplay-route-sync.spec.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it, vi } from 'vitest';
+
+import { syncHashRoute } from './gameplay-route-sync';
+
+describe('gameplay route sync', () => {
+  it('maps host status to hash phase route with session context', () => {
+    vi.stubGlobal('window', {
+      location: { hash: '#/host/lobby/ABCD12' },
+      history: { replaceState: vi.fn() },
+    });
+
+    const ok = syncHashRoute('host', { session: { code: 'abcd12', status: 'guess' } });
+
+    expect(ok).toBe(true);
+    expect(window.history.replaceState).toHaveBeenCalledWith(null, '', '#/host/guess/ABCD12');
+  });
+
+  it('returns false for unsupported status to allow controlled fallback', () => {
+    vi.stubGlobal('window', {
+      location: { hash: '#/player/lobby/ABCD12' },
+      history: { replaceState: vi.fn() },
+    });
+
+    const ok = syncHashRoute('player', { session: { code: 'ABCD12', status: 'waiting' } });
+
+    expect(ok).toBe(false);
+    expect(window.history.replaceState).not.toHaveBeenCalled();
+  });
+});

frontend/angular/src/app/gameplay-route-sync.ts

@@ -0,0 +1,73 @@
+import { deriveGameplayPhase } from '../../../src/spa/gameplay-phase-machine';
+
+type ShellMode = 'host' | 'player';
+
+interface SessionLike {
+  session: {
+    code: string;
+    status: string;
+  };
+}
+
+function normalizeCode(value: string): string {
+  return value.trim().toUpperCase();
+}
+
+function toRoutePhase(status: string): string | null {
+  if (status === 'lobby') {
+    return 'lobby';
+  }
+
+  const phase = deriveGameplayPhase({
+    session: { code: 'route-sync', status, host_id: null, current_round: 1, players_count: 0 },
+    players: [],
+    round_question: null,
+    phase_view_model: {
+      status,
+      round_number: 1,
+      players_count: 0,
+      constraints: {
+        min_players_to_start: 0,
+        max_players_mvp: 0,
+        min_players_reached: false,
+        max_players_allowed: false,
+      },
+      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: false,
+        can_finish_game: false,
+      },
+      player: {
+        can_join: false,
+        can_submit_lie: false,
+        can_submit_guess: false,
+        can_view_final_result: false,
+      },
+    },
+  });
+
+  return phase;
+}
+
+export function syncHashRoute(mode: ShellMode, session: SessionLike): boolean {
+  if (typeof window === 'undefined') {
+    return true;
+  }
+
+  const code = normalizeCode(session.session.code);
+  const phase = toRoutePhase(session.session.status);
+  if (!code || !phase) {
+    return false;
+  }
+
+  const nextHash = `#/${mode}/${phase}/${encodeURIComponent(code)}`;
+  if (window.location.hash !== nextHash) {
+    window.history.replaceState(null, '', nextHash);
+  }
+
+  return true;
+}

frontend/angular/src/app/i18n-mvp-flow-smoke.spec.ts

@@ -1,61 +0,0 @@
-import { afterEach, describe, expect, it, vi } from 'vitest';
-
-import { HostShellComponent } from './features/host/host-shell.component';
-import { PlayerShellComponent } from './features/player/player-shell.component';
-import { setPreferredLocale } from './lobby-i18n';
-
-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 });
-
-    const host = new HostShellComponent();
-    const player = new PlayerShellComponent();
-    host.ngOnInit();
-    player.ngOnInit();
-
-    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');
-
-    player.ngOnDestroy();
-    host.ngOnDestroy();
-  });
-
-  it('keeps audio routing policy primary-only (client has no audio output)', () => {
-    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 });
-
-    const host = new HostShellComponent();
-    const player = new PlayerShellComponent();
-
-    expect(host.clientHasNoAudioOutput).toBe(true);
-    expect(player.clientHasNoAudioOutput).toBe(true);
-
-    player.ngOnDestroy();
-    host.ngOnDestroy();
-  });
-});

frontend/angular/src/app/lobby-i18n.spec.ts

@@ -1,137 +0,0 @@
-import { afterEach, describe, expect, it, vi } from 'vitest';
-
-type StorageLike = {
-  getItem: (key: string) => string | null;
-  setItem: (key: string, value: string) => void;
-};
-
-function storageMock(initial: Record<string, string> = {}): StorageLike {
-  const data = new Map<string, string>(Object.entries(initial));
-  return {
-    getItem: vi.fn((key: string) => data.get(key) ?? null),
-    setItem: vi.fn((key: string, value: string) => {
-      data.set(key, value);
-    }),
-  };
-}
-
-describe('lobby i18n locale propagation', () => {
-  afterEach(() => {
-    vi.restoreAllMocks();
-    vi.unstubAllGlobals();
-    vi.resetModules();
-  });
-
-  it('notifies subscribers immediately and on locale changes', async () => {
-    const localStorage = storageMock({ 'wpp.locale': 'en' });
-    vi.stubGlobal('window', {
-      location: { search: '' },
-      localStorage,
-    });
-    vi.stubGlobal('navigator', { language: 'en-US' });
-
-    const i18n = await import('./lobby-i18n');
-
-    const updates: string[] = [];
-    const unsubscribe = i18n.subscribeToLocaleChanges((locale) => updates.push(locale));
-
-    expect(updates).toEqual(['en']);
-
-    i18n.setPreferredLocale('da');
-    expect(updates).toEqual(['en', 'da']);
-
-    unsubscribe();
-    i18n.setPreferredLocale('en');
-    expect(updates).toEqual(['en', 'da']);
-  });
-
-  it('prefers backend-provided shell locale over browser defaults', async () => {
-    vi.stubGlobal('window', {
-      location: { search: '' },
-      localStorage: storageMock(),
-    });
-    vi.stubGlobal('document', {
-      body: { dataset: { wppLocale: 'da' } },
-      querySelector: vi.fn(() => null),
-    });
-    vi.stubGlobal('navigator', { language: 'en-US' });
-
-    const i18n = await import('./lobby-i18n');
-
-    expect(i18n.resolvePreferredLocale()).toBe('da');
-  });
-
-  it('falls back to default en translation when da key is intentionally missing', async () => {
-    vi.stubGlobal('window', {
-      location: { search: '' },
-      localStorage: storageMock({ 'wpp.locale': 'da' }),
-    });
-    vi.stubGlobal('navigator', { language: 'da-DK' });
-
-    const i18n = await import('./lobby-i18n');
-    const catalogModule = await import('../../../../shared/i18n/lobby.json');
-    const catalog = catalogModule.default as {
-      frontend: {
-        ui: {
-          common: {
-            refresh: {
-              en?: string;
-              da?: string;
-            };
-          };
-        };
-      };
-    };
-
-    const originalDa = catalog.frontend.ui.common.refresh.da;
-    catalog.frontend.ui.common.refresh.da = undefined;
-
-    try {
-      expect(i18n.t('common.refresh', 'da')).toBe(catalog.frontend.ui.common.refresh.en);
-    } finally {
-      catalog.frontend.ui.common.refresh.da = originalDa;
-    }
-  });
-
-  it('resolves baseline shell/game keys from shared namespaces', async () => {
-    vi.stubGlobal('window', {
-      location: { search: '' },
-      localStorage: storageMock({ 'wpp.locale': 'da' }),
-    });
-    vi.stubGlobal('navigator', { language: 'da-DK' });
-
-    const i18n = await import('./lobby-i18n');
-
-    const baselineKeys = [
-      'lobby.shell.title',
-      'lobby.shell.host_nav',
-      'lobby.shell.player_nav',
-      'lobby.shell.language_label',
-      'common.refresh',
-      'common.session_code',
-      'game.host.title',
-      'game.host.start_round',
-      'game.player.title',
-      'game.player.submit_guess',
-    ] as const;
-
-    for (const key of baselineKeys) {
-      const value = i18n.t(key, 'da');
-      expect(value).toBeTypeOf('string');
-      expect(value.length).toBeGreaterThan(0);
-      expect(value).not.toBe(key);
-    }
-  });
-
-  it('exposes primary-only audio routing policy to clients', async () => {
-    vi.stubGlobal('window', {
-      location: { search: '' },
-      localStorage: storageMock({ 'wpp.locale': 'en' }),
-    });
-    vi.stubGlobal('navigator', { language: 'en-US' });
-
-    const i18n = await import('./lobby-i18n');
-
-    expect(i18n.clientHasNoAudioOutput).toBe(true);
-  });
-});

frontend/angular/src/app/lobby-i18n.ts

@@ -1,102 +0,0 @@
-import lobbyCatalog from '../../../../shared/i18n/lobby.json';
-
-type SupportedLocale = (typeof lobbyCatalog.locales.supported)[number];
-
-const DEFAULT_LOCALE = lobbyCatalog.locales.default as SupportedLocale;
-const SUPPORTED_LOCALES = lobbyCatalog.locales.supported as readonly SupportedLocale[];
-
-let activeLocale: SupportedLocale | null = null;
-const localeSubscribers = new Set<(locale: SupportedLocale) => void>();
-
-export function normalizeLocale(rawLocale?: string | null): SupportedLocale {
-  const locale = (rawLocale ?? '').trim().toLowerCase();
-  if ((SUPPORTED_LOCALES as readonly string[]).includes(locale)) {
-    return locale as SupportedLocale;
-  }
-
-  const shortLocale = locale.split('-')[0] ?? '';
-  if ((SUPPORTED_LOCALES as readonly string[]).includes(shortLocale)) {
-    return shortLocale as SupportedLocale;
-  }
-
-  return DEFAULT_LOCALE;
-}
-
-export function resolvePreferredLocale(): SupportedLocale {
-  if (activeLocale) {
-    return activeLocale;
-  }
-
-  if (typeof window === 'undefined') {
-    activeLocale = DEFAULT_LOCALE;
-    return activeLocale;
-  }
-
-  const rootLocale =
-    typeof document !== 'undefined' ? document.querySelector<HTMLElement>('app-root')?.dataset?.['wppLocale'] : null;
-  const shellLocale = typeof document !== 'undefined' ? document.body?.dataset?.['wppLocale'] : null;
-  const queryLocale = new URLSearchParams(window.location?.search ?? '').get('lang');
-  const storedLocale = window.localStorage?.getItem?.('wpp.locale');
-  const browserLocale = typeof navigator !== 'undefined' ? navigator.language : '';
-
-  activeLocale = normalizeLocale(rootLocale || shellLocale || queryLocale || storedLocale || browserLocale || DEFAULT_LOCALE);
-  return activeLocale;
-}
-
-export function setPreferredLocale(locale: string): SupportedLocale {
-  const normalized = normalizeLocale(locale);
-  activeLocale = normalized;
-  if (typeof window !== 'undefined') {
-    window.localStorage?.setItem?.('wpp.locale', normalized);
-  }
-
-  for (const subscriber of localeSubscribers) {
-    subscriber(normalized);
-  }
-
-  return normalized;
-}
-
-export function subscribeToLocaleChanges(callback: (locale: SupportedLocale) => void): () => void {
-  localeSubscribers.add(callback);
-  callback(resolvePreferredLocale());
-  return () => {
-    localeSubscribers.delete(callback);
-  };
-}
-
-function resolveCatalogPath(key: string): string {
-  if (key.startsWith('lobby.shell.')) {
-    return key.replace(/^lobby\.shell\./, 'app.');
-  }
-  if (key.startsWith('game.host.')) {
-    return key.replace(/^game\.host\./, 'host.');
-  }
-  if (key.startsWith('game.player.')) {
-    return key.replace(/^game\.player\./, 'player.');
-  }
-  return key;
-}
-
-export function t(key: string, locale: string): string {
-  const normalizedLocale = normalizeLocale(locale);
-  const fallbackLocale = DEFAULT_LOCALE;
-  const segments = resolveCatalogPath(key).split('.');
-
-  let cursor: unknown = lobbyCatalog.frontend.ui;
-  for (const segment of segments) {
-    if (!cursor || typeof cursor !== 'object' || !(segment in (cursor as Record<string, unknown>))) {
-      return key;
-    }
-    cursor = (cursor as Record<string, unknown>)[segment];
-  }
-
-  if (!cursor || typeof cursor !== 'object') {
-    return key;
-  }
-
-  const translations = cursor as Record<string, string>;
-  return translations[normalizedLocale] ?? translations[fallbackLocale] ?? key;
-}
-
-export const clientHasNoAudioOutput = Boolean(lobbyCatalog.frontend.capabilities.client_has_no_audio_output);

frontend/src/spa/gameplay-phase-machine.ts

@@ -46,7 +46,7 @@ export function deriveGameplayPhase(session: SessionDetailResponse | null): Game
     return null;
   }
 
-  if (status === 'lie' || status === 'guess' || status === 'reveal' || status === 'scoreboard') {
+  if (status === 'lie' || status === 'guess' || status === 'reveal') {
     return status;
   }
 

frontend/src/spa/lobby-i18n.ts

@@ -1,55 +1,31 @@
 import lobbyCatalog from '../../../shared/i18n/lobby.json';
 
+type FrontendErrorKey = keyof typeof lobbyCatalog.frontend.errors;
+
 const frontendErrors = lobbyCatalog.frontend.errors;
-const localeConfig = lobbyCatalog.locales;
-const backendToFrontendErrorKeys = lobbyCatalog.contract.backend_to_frontend_error_keys as Record<string, keyof typeof frontendErrors>;
 
-type FrontendErrorKey = keyof typeof frontendErrors;
-type SupportedLocale = (typeof localeConfig.supported)[number];
+const apiErrorMap: Record<string, FrontendErrorKey> = {
+  session_code_required: 'session_code_required',
+  session_not_found: 'session_not_found',
+  nickname_invalid: 'nickname_invalid',
+  nickname_taken: 'nickname_taken'
+};
 
-function isFrontendErrorKey(value: string): value is FrontendErrorKey {
-  return value in frontendErrors;
+export function lobbyMessage(key: FrontendErrorKey): string {
+  return frontendErrors[key] ?? frontendErrors.unknown;
 }
 
-function normalizeLocale(rawLocale?: string): SupportedLocale {
-  const requested = (rawLocale ?? '').trim().toLowerCase();
-  if (localeConfig.supported.includes(requested as SupportedLocale)) {
-    return requested as SupportedLocale;
-  }
-  return localeConfig.default;
-}
-
-export function lobbyMessage(key: FrontendErrorKey, locale?: string): string {
-  const resolvedLocale = normalizeLocale(locale);
-  const translations = frontendErrors[key] as Record<string, string>;
-
-  if (translations[resolvedLocale]) {
-    return translations[resolvedLocale];
-  }
-  if (translations[localeConfig.default]) {
-    return translations[localeConfig.default];
-  }
-
-  return key;
-}
-
-export function lobbyMessageFromApiPayload(payload: unknown, fallbackKey: FrontendErrorKey, locale?: string): string {
+export function lobbyMessageFromApiPayload(payload: unknown, fallbackKey: FrontendErrorKey): string {
   if (!payload || typeof payload !== 'object') {
-    return lobbyMessage(fallbackKey, locale);
+    return lobbyMessage(fallbackKey);
   }
 
   const record = payload as Record<string, unknown>;
   const code = typeof record.error_code === 'string' ? record.error_code : '';
-  const payloadLocale = typeof record.locale === 'string' ? record.locale : locale;
-  const mappedKey = code ? backendToFrontendErrorKeys[code] : undefined;
-
-  if (mappedKey && isFrontendErrorKey(mappedKey)) {
-    return lobbyMessage(mappedKey, payloadLocale);
+  const mappedKey = apiErrorMap[code];
+  if (!mappedKey) {
+    return lobbyMessage(fallbackKey);
   }
 
-  if (isFrontendErrorKey(code)) {
-    return lobbyMessage(code, payloadLocale);
-  }
-
-  return lobbyMessage(fallbackKey, payloadLocale);
+  return lobbyMessage(mappedKey);
 }

frontend/tests/lobby-i18n.contract.test.ts

@@ -1,68 +0,0 @@
-import { describe, expect, it } from 'vitest';
-
-import lobbyCatalog from '../../shared/i18n/lobby.json';
-import { lobbyMessage, lobbyMessageFromApiPayload } from '../src/spa/lobby-i18n';
-
-describe('shared i18n keyspace contract', () => {
-  it('keeps en as default and da/en matrix for frontend error keys', () => {
-    expect(lobbyCatalog.locales.default).toBe('en');
-    expect(lobbyCatalog.locales.supported).toEqual(expect.arrayContaining(['en', 'da']));
-
-    for (const [key, translations] of Object.entries(lobbyCatalog.frontend.errors)) {
-      expect(translations.en, `${key} missing en`).toBeTruthy();
-      expect(translations.da, `${key} missing da`).toBeTruthy();
-    }
-  });
-
-  it('keeps backend error-code keyspace aligned with shared backend→frontend map and backend translations', () => {
-    for (const [code, backendKey] of Object.entries(lobbyCatalog.backend.error_codes)) {
-      const frontendKey =
-        lobbyCatalog.contract.backend_to_frontend_error_keys[
-          code as keyof typeof lobbyCatalog.contract.backend_to_frontend_error_keys
-        ];
-
-      expect(lobbyCatalog.backend.errors[backendKey as keyof typeof lobbyCatalog.backend.errors]).toBeDefined();
-      expect(frontendKey, `missing frontend mapping for ${code}`).toBeTruthy();
-      expect(lobbyCatalog.frontend.errors[frontendKey as keyof typeof lobbyCatalog.frontend.errors]).toBeDefined();
-    }
-
-    for (const [key, translations] of Object.entries(lobbyCatalog.backend.errors)) {
-      expect(translations.en, `${key} missing en`).toBeTruthy();
-      expect(translations.da, `${key} missing da`).toBeTruthy();
-    }
-  });
-});
-
-describe('lobbyMessage locale handling', () => {
-  it('uses english by default and falls back to default for unsupported locale', () => {
-    expect(lobbyMessage('session_code_required')).toBe('Session code is required.');
-    expect(lobbyMessage('session_code_required', 'fr')).toBe('Session code is required.');
-  });
-
-  it('resolves locale from api payload and maps known backend error codes directly', () => {
-    expect(
-      lobbyMessageFromApiPayload(
-        { error_code: 'session_not_found', locale: 'da' },
-        'join_failed',
-      ),
-    ).toBe('Sessionskoden er ugyldig, eller sessionen findes ikke længere.');
-  });
-
-  it('uses shared backend→frontend key-map at runtime even when fallback key differs', () => {
-    expect(
-      lobbyMessageFromApiPayload(
-        { error_code: 'session_not_joinable', locale: 'da' },
-        'start_round_failed',
-      ),
-    ).toBe('Kunne ikke joine. Tjek kode eller kaldenavn og prøv igen.');
-  });
-
-  it('falls back to caller-provided fallback key for unknown backend error codes', () => {
-    expect(
-      lobbyMessageFromApiPayload(
-        { error_code: 'unknown_backend_key', locale: 'da' },
-        'join_failed',
-      ),
-    ).toBe('Kunne ikke joine. Tjek kode eller kaldenavn og prøv igen.');
-  });
-});

lobby/i18n.py

@@ -1,12 +1,8 @@
 import json
-import logging
 from functools import lru_cache
 from pathlib import Path
 
-from django.http import HttpRequest, JsonResponse
-from django.utils.translation import get_language_from_request
-
-LOGGER = logging.getLogger(__name__)
+from django.http import JsonResponse
 
 
 @lru_cache(maxsize=1)
@@ -16,61 +12,9 @@ def lobby_i18n_catalog() -> dict:
         return json.load(handle)
 
 
-@lru_cache(maxsize=1)
-def i18n_locale_config() -> tuple[str, tuple[str, ...]]:
-    locales = lobby_i18n_catalog().get("locales", {})
-    default_locale = str(locales.get("default", "en")).strip().lower() or "en"
-    supported_locales = tuple(
-        locale.strip().lower() for locale in locales.get("supported", ["en", "da"]) if str(locale).strip()
-    ) or ("en", "da")
-    return default_locale, supported_locales
-
-
 def lobby_i18n_errors() -> dict:
     return lobby_i18n_catalog().get("backend", {}).get("error_codes", {})
 
 
-def lobby_i18n_error_messages() -> dict:
-    return lobby_i18n_catalog().get("backend", {}).get("errors", {})
-
-
-def resolve_locale(request: HttpRequest) -> str:
-    default_locale, supported_locales = i18n_locale_config()
-
-    raw_accept_language = (request.META.get("HTTP_ACCEPT_LANGUAGE") or "").split(",", 1)[0]
-    raw_requested = raw_accept_language.split(";", 1)[0].strip().replace("_", "-").split("-", 1)[0].lower()
-    if raw_requested in supported_locales:
-        return raw_requested
-
-    requested = (get_language_from_request(request) or "").replace("_", "-").split("-", 1)[0].lower()
-    if requested in supported_locales:
-        return requested
-    return default_locale
-
-
-def resolve_error_message(*, key: str, locale: str) -> str:
-    default_locale, _supported_locales = i18n_locale_config()
-    translations = lobby_i18n_error_messages().get(key)
-    if not isinstance(translations, dict):
-        LOGGER.warning("i18n key missing in shared catalog", extra={"key": key, "locale": locale})
-        return key
-
-    if locale in translations and translations[locale]:
-        return translations[locale]
-    if default_locale in translations and translations[default_locale]:
-        return translations[default_locale]
-
-    LOGGER.warning("i18n translation missing for key", extra={"key": key, "locale": locale})
-    return key
-
-
-def api_error(request: HttpRequest, *, key: str, status: int) -> JsonResponse:
-    locale = resolve_locale(request)
-    return JsonResponse(
-        {
-            "error": resolve_error_message(key=key, locale=locale),
-            "error_code": key,
-            "locale": locale,
-        },
-        status=status,
-    )
+def api_error(*, code: str, message: str, status: int) -> JsonResponse:
+    return JsonResponse({"error": message, "error_code": code}, status=status)

lobby/templates/lobby/player_screen.html

@@ -89,8 +89,6 @@ var connectionRetryInFlight=false;
 var playerShellFatalError=false;
 var playerShellRecoverInFlight=false;
 var playerCriticalHydrated=false;
-function silencePlayerMediaElements(){if(typeof document==="undefined"||typeof document.querySelectorAll!=="function"){return;}var elements=document.querySelectorAll("audio,video");if(!elements||typeof elements.forEach!=="function"){return;}elements.forEach(function(element){if(!element){return;}element.muted=true;if(typeof element.pause==="function"){element.pause();}});}
-function installSecondaryDeviceAudioGuard(){if(typeof window==="undefined"){return;}silencePlayerMediaElements();var mediaProto=window.HTMLMediaElement&&window.HTMLMediaElement.prototype;if(!mediaProto||typeof mediaProto.play!=="function"){return;}if(mediaProto.__wppSecondaryDeviceAudioGuardInstalled){return;}mediaProto.__wppSecondaryDeviceAudioGuardInstalled=true;mediaProto.__wppSecondaryDeviceAudioGuardOriginalPlay=mediaProto.play;mediaProto.play=function(){return Promise.resolve();};}
 function setPlayerCriticalLoading(isLoading){var skeleton=document.getElementById("playerCriticalSkeleton");var view=document.getElementById("playerCriticalView");if(!skeleton||!view){return;}skeleton.style.display=isLoading?"block":"none";view.style.display=isLoading?"none":"block";}
 function hydratePlayerCriticalView(data){var phaseEl=document.getElementById("playerCriticalPhase");var roundEl=document.getElementById("playerCriticalRound");var joinEl=document.getElementById("playerCriticalJoin");if(phaseEl){phaseEl.textContent="Fase: "+phaseLabel(currentSessionStatus||((data&&data.session&&data.session.status)||""));}
 if(roundEl){roundEl.textContent="Round question: "+(rq()||"afventer");}
@@ -155,7 +153,6 @@ function submitGuess(){if(guessSubmitted){return Promise.resolve({error:"guess_a
 ["code","nickname","playerId","sessionToken","roundQuestionId"].forEach(function(fieldId){var field=document.getElementById(fieldId);if(!field){return;}field.addEventListener("input",function(){if(fieldId!=="roundQuestionId"){resetRoundContextForManualChange();}updateLieSubmitState();updateGuessSubmitState();updateJoinState();updateSessionDetailState();savePlayerContext();});field.addEventListener("change",function(){if(fieldId!=="roundQuestionId"){resetRoundContextForManualChange();}updateLieSubmitState();updateGuessSubmitState();updateJoinState();updateSessionDetailState();savePlayerContext();});});
 window.addEventListener("error",function(event){setPlayerShellFatalError((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");setPlayerShellFatalError(detail);});
-installSecondaryDeviceAudioGuard();
 setPlayerCriticalLoading(true);
 updatePhaseStatus();
 updateGuessSubmitState();

lobby/templates/lobby/spa_shell.html

@@ -1,13 +1,13 @@
 <!doctype html>
-<html lang="{{ shell_locale|default:'en' }}">
+<html lang="da">
 <head>
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>WPP SPA Shell</title>
-  <link rel="stylesheet" href="{{ spa_asset_base }}/styles.css?v={{ spa_asset_version|urlencode }}">
+  <link rel="stylesheet" href="{{ spa_asset_base }}/styles.css">
 </head>
-<body data-wpp-shell-route="{{ shell_route }}" data-wpp-shell-kind="{{ shell_kind }}" data-wpp-locale="{{ shell_locale|default:'en' }}">
-  <app-root data-wpp-shell-route="{{ shell_route }}" data-wpp-shell-kind="{{ shell_kind }}" data-wpp-locale="{{ shell_locale|default:'en' }}">Indlæser Angular app-shell…</app-root>
-  <script type="module" src="{{ spa_asset_base }}/main.js?v={{ spa_asset_version|urlencode }}"></script>
+<body data-wpp-shell-route="{{ shell_route }}" data-wpp-shell-kind="{{ shell_kind }}">
+  <app-root data-wpp-shell-route="{{ shell_route }}" data-wpp-shell-kind="{{ shell_kind }}">Indlæser Angular app-shell…</app-root>
+  <script type="module" src="{{ spa_asset_base }}/main.js"></script>
 </body>
 </html>

lobby/tests.py

@@ -2,7 +2,6 @@ import json
 import tempfile
 from datetime import timedelta
 from pathlib import Path
-from unittest.mock import patch
 
 from django.contrib.auth import get_user_model
 from django.core.management import call_command
@@ -20,7 +19,6 @@ from fupogfakta.models import (
     RoundConfig,
     RoundQuestion,
 )
-from lobby.i18n import i18n_locale_config, lobby_i18n_catalog, resolve_error_message, resolve_locale
 
 User = get_user_model()
 
@@ -112,32 +110,6 @@ class LobbyFlowTests(TestCase):
         self.assertEqual(response.status_code, 400)
         self.assertEqual(response.json()["error"], "Session is not joinable")
 
-    def test_join_error_localizes_to_danish_with_accept_language_header(self):
-        response = self.client.post(
-            reverse("lobby:join_session"),
-            data={"code": "   ", "nickname": "Luna"},
-            content_type="application/json",
-            HTTP_ACCEPT_LANGUAGE="da",
-        )
-
-        self.assertEqual(response.status_code, 400)
-        self.assertEqual(response.json()["error_code"], "session_code_required")
-        self.assertEqual(response.json()["locale"], "da")
-        self.assertEqual(response.json()["error"], "Sessionskode er påkrævet")
-
-    def test_join_error_falls_back_to_english_for_unsupported_locale(self):
-        response = self.client.post(
-            reverse("lobby:join_session"),
-            data={"code": "   ", "nickname": "Luna"},
-            content_type="application/json",
-            HTTP_ACCEPT_LANGUAGE="fr",
-        )
-
-        self.assertEqual(response.status_code, 400)
-        self.assertEqual(response.json()["error_code"], "session_code_required")
-        self.assertEqual(response.json()["locale"], "en")
-        self.assertEqual(response.json()["error"], "Session code is required")
-
     def test_session_detail_returns_players(self):
         session = GameSession.objects.create(host=self.host, code="LMNO45")
         Player.objects.create(session=session, nickname="Mia", score=7)
@@ -209,8 +181,6 @@ class StartRoundTests(TestCase):
         )
 
         self.assertEqual(response.status_code, 403)
-        self.assertEqual(response.json()["error_code"], "host_only_start_round")
-        self.assertEqual(response.json()["locale"], "en")
         self.assertEqual(response.json()["error"], "Only host can start round")
 
     def test_start_round_requires_existing_active_category_with_questions(self):
@@ -230,8 +200,6 @@ class StartRoundTests(TestCase):
             content_type="application/json",
         )
         self.assertEqual(response.status_code, 400)
-        self.assertEqual(response.json()["error_code"], "category_has_no_questions")
-        self.assertEqual(response.json()["locale"], "en")
         self.assertEqual(response.json()["error"], "Category has no active questions")
 
     def test_start_round_rejects_non_lobby_session(self):
@@ -248,36 +216,6 @@ class StartRoundTests(TestCase):
         self.assertEqual(response.status_code, 400)
         self.assertEqual(response.json()["error"], "Round can only be started from lobby")
 
-    def test_start_round_error_localizes_to_danish(self):
-        self.client.login(username="other", 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",
-            HTTP_ACCEPT_LANGUAGE="da",
-        )
-
-        self.assertEqual(response.status_code, 403)
-        self.assertEqual(response.json()["error_code"], "host_only_start_round")
-        self.assertEqual(response.json()["locale"], "da")
-        self.assertEqual(response.json()["error"], "Kun værten kan starte runden")
-
-    def test_start_round_error_falls_back_to_english_for_unsupported_locale(self):
-        self.client.login(username="other", 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",
-            HTTP_ACCEPT_LANGUAGE="fr",
-        )
-
-        self.assertEqual(response.status_code, 403)
-        self.assertEqual(response.json()["error_code"], "host_only_start_round")
-        self.assertEqual(response.json()["locale"], "en")
-        self.assertEqual(response.json()["error"], "Only host can start round")
-
 
 class LieSubmissionTests(TestCase):
     def setUp(self):
@@ -468,8 +406,6 @@ class MixAnswersTests(TestCase):
         )
 
         self.assertEqual(response.status_code, 403)
-        self.assertEqual(response.json()["error_code"], "host_only_mix_answers")
-        self.assertEqual(response.json()["locale"], "en")
         self.assertEqual(response.json()["error"], "Only host can mix answers")
 
     def test_mix_answers_deduplicates_case_insensitive_lies(self):
@@ -1035,10 +971,6 @@ class UiScreenTests(TestCase):
         self.assertContains(response, "clearPlayerShellFatalError")
         self.assertContains(response, "updatePlayerShellErrorBoundary")
         self.assertContains(response, "player_shell_runtime_error")
-        self.assertContains(response, "installSecondaryDeviceAudioGuard")
-        self.assertContains(response, "silencePlayerMediaElements")
-        self.assertContains(response, "querySelectorAll(\"audio,video\")")
-        self.assertNotContains(response, "<audio")
         self.assertContains(response, "window.addEventListener(\"error\"")
 
     @override_settings(USE_SPA_UI=False)
@@ -1063,8 +995,7 @@ class UiScreenTests(TestCase):
         self.assertContains(response, "<app-root")
         self.assertContains(response, "data-wpp-shell-route=\"/host\"")
         self.assertContains(response, "data-wpp-shell-kind=\"host\"")
-        self.assertContains(response, "/static/frontend/angular/browser/main.js?v=dev")
-        self.assertContains(response, "/static/frontend/angular/browser/styles.css?v=dev")
+        self.assertContains(response, "/static/frontend/angular/browser/main.js")
 
     @override_settings(USE_SPA_UI=True)
     def test_host_screen_deeplink_preserves_spa_path_when_feature_flag_enabled(self):
@@ -1098,17 +1029,7 @@ class UiScreenTests(TestCase):
         self.assertContains(response, "<app-root")
         self.assertContains(response, "data-wpp-shell-route=\"/player\"")
         self.assertContains(response, "data-wpp-shell-kind=\"player\"")
-        self.assertContains(response, "/static/frontend/angular/browser/main.js?v=dev")
-
-    @override_settings(USE_SPA_UI=True, WPP_SPA_ASSET_VERSION="release-2026-03-01")
-    def test_spa_shell_uses_configured_asset_version_for_cache_busting(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, "/static/frontend/angular/browser/styles.css?v=release-2026-03-01")
-        self.assertContains(response, "/static/frontend/angular/browser/main.js?v=release-2026-03-01")
+        self.assertContains(response, "/static/frontend/angular/browser/main.js")
 
 
 class SessionDetailRoundQuestionTests(TestCase):
@@ -1253,85 +1174,3 @@ class SmokeStagingCommandTests(TestCase):
                     "finish_game",
                 ],
             )
-
-
-class I18nResolverTests(TestCase):
-    def test_resolve_locale_accepts_language_tags_and_normalizes_to_supported_base_locale(self):
-        response = self.client.post(
-            reverse("lobby:join_session"),
-            data={"code": "", "nickname": "Luna"},
-            content_type="application/json",
-            HTTP_ACCEPT_LANGUAGE="da-DK,da;q=0.9,en;q=0.8",
-        )
-
-        self.assertEqual(response.status_code, 400)
-        self.assertEqual(resolve_locale(response.wsgi_request), "da")
-
-    def test_resolve_locale_accepts_underscore_language_tags(self):
-        response = self.client.post(
-            reverse("lobby:join_session"),
-            data={"code": "", "nickname": "Luna"},
-            content_type="application/json",
-            HTTP_ACCEPT_LANGUAGE="da_DK",
-        )
-
-        self.assertEqual(response.status_code, 400)
-        self.assertEqual(resolve_locale(response.wsgi_request), "da")
-
-    def test_resolve_locale_defaults_to_en_when_header_missing(self):
-        response = self.client.post(
-            reverse("lobby:join_session"),
-            data={"code": "", "nickname": "Luna"},
-            content_type="application/json",
-        )
-
-        self.assertEqual(response.status_code, 400)
-        self.assertEqual(resolve_locale(response.wsgi_request), "en")
-
-    def test_missing_backend_key_returns_key_deterministically(self):
-        self.assertEqual(resolve_error_message(key="missing_key", locale="da"), "missing_key")
-
-    def test_missing_backend_key_is_logged_with_context(self):
-        with self.assertLogs("lobby.i18n", level="WARNING") as logs:
-            result = resolve_error_message(key="missing_key", locale="da")
-
-        self.assertEqual(result, "missing_key")
-        self.assertTrue(any("i18n key 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",
-            return_value={"session_code_required": {"en": "Session code is required"}},
-        ):
-            self.assertEqual(
-                resolve_error_message(key="session_code_required", locale="da"),
-                "Session code is required",
-            )
-
-    def test_shared_catalog_uses_en_default_and_da_en_matrix(self):
-        default_locale, supported_locales = i18n_locale_config()
-        catalog = lobby_i18n_catalog()
-
-        self.assertEqual(default_locale, "en")
-        self.assertIn("en", supported_locales)
-        self.assertIn("da", supported_locales)
-
-        for key, translations in catalog["backend"]["errors"].items():
-            self.assertTrue(translations.get("en"), f"backend key {key} missing en")
-            self.assertTrue(translations.get("da"), f"backend key {key} missing da")
-
-        for key, translations in catalog["frontend"]["errors"].items():
-            self.assertTrue(translations.get("en"), f"frontend key {key} missing en")
-            self.assertTrue(translations.get("da"), f"frontend key {key} missing da")
-
-    def test_backend_error_codes_map_via_shared_backend_frontend_key_map(self):
-        catalog = lobby_i18n_catalog()
-        backend_errors = catalog["backend"]["errors"]
-        frontend_errors = catalog["frontend"]["errors"]
-        shared_map = catalog["contract"]["backend_to_frontend_error_keys"]
-
-        for code, backend_key in catalog["backend"]["error_codes"].items():
-            frontend_key = shared_map.get(code)
-            self.assertIn(backend_key, backend_errors)
-            self.assertTrue(frontend_key, f"missing frontend mapping for backend code: {code}")
-            self.assertIn(frontend_key, frontend_errors)

lobby/ui_views.py

@@ -5,7 +5,7 @@ from django.shortcuts import render
 from fupogfakta.models import Category
 
 from .feature_flags import use_spa_ui
-from .i18n import lobby_i18n_catalog, resolve_locale
+from .i18n import lobby_i18n_catalog
 
 
 def _render_spa_shell(request, shell_route: str, shell_kind: str):
@@ -16,9 +16,7 @@ def _render_spa_shell(request, shell_route: str, shell_kind: str):
             "shell_route": shell_route,
             "shell_kind": shell_kind,
             "spa_asset_base": settings.WPP_SPA_ASSET_BASE,
-            "spa_asset_version": getattr(settings, "WPP_SPA_ASSET_VERSION", "dev"),
             "lobby_i18n": lobby_i18n_catalog(),
-            "shell_locale": resolve_locale(request),
         },
     )
 

lobby/views.py

@@ -128,15 +128,15 @@ def join_session(request: HttpRequest) -> JsonResponse:
 
     if not code:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_code_required", "session_code_required"),
+            code=ERROR_CODES.get("session_code_required", "session_code_required"),
+            message="Session code is required",
             status=400,
         )
 
     if len(nickname) < 2 or len(nickname) > 40:
         return api_error(
-            request,
-            key=ERROR_CODES.get("nickname_invalid", "nickname_invalid"),
+            code=ERROR_CODES.get("nickname_invalid", "nickname_invalid"),
+            message="Nickname must be between 2 and 40 characters",
             status=400,
         )
 
@@ -144,22 +144,22 @@ def join_session(request: HttpRequest) -> JsonResponse:
         session = GameSession.objects.get(code=code)
     except GameSession.DoesNotExist:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_found", "session_not_found"),
+            code=ERROR_CODES.get("session_not_found", "session_not_found"),
+            message="Session not found",
             status=404,
         )
 
     if session.status not in JOINABLE_STATUSES:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_joinable", "session_not_joinable"),
+            code=ERROR_CODES.get("session_not_joinable", "session_not_joinable"),
+            message="Session is not joinable",
             status=400,
         )
 
     if Player.objects.filter(session=session, nickname__iexact=nickname).exists():
         return api_error(
-            request,
-            key=ERROR_CODES.get("nickname_taken", "nickname_taken"),
+            code=ERROR_CODES.get("nickname_taken", "nickname_taken"),
+            message="Nickname already taken",
             status=409,
         )
 
@@ -190,8 +190,8 @@ def session_detail(request: HttpRequest, code: str) -> JsonResponse:
         session = GameSession.objects.get(code=session_code)
     except GameSession.DoesNotExist:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_found", "session_not_found"),
+            code=ERROR_CODES.get("session_not_found", "session_not_found"),
+            message="Session not found",
             status=404,
         )
 
@@ -251,8 +251,8 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
 
     if not category_slug:
         return api_error(
-            request,
-            key=ERROR_CODES.get("category_slug_required", "category_slug_required"),
+            code=ERROR_CODES.get("category_slug_required", "category_slug_required"),
+            message="category_slug is required",
             status=400,
         )
 
@@ -262,22 +262,18 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
         session = GameSession.objects.get(code=session_code)
     except GameSession.DoesNotExist:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_found", "session_not_found"),
+            code=ERROR_CODES.get("session_not_found", "session_not_found"),
+            message="Session not found",
             status=404,
         )
 
     if session.host_id != request.user.id:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("host_only_start_round", "host_only_start_round"),
-            status=403,
-        )
+        return JsonResponse({"error": "Only host can start round"}, status=403)
 
     if session.status != GameSession.Status.LOBBY:
         return api_error(
-            request,
-            key=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
+            code=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
+            message="Round can only be started from lobby",
             status=400,
         )
 
@@ -285,24 +281,20 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
         category = Category.objects.get(slug=category_slug, is_active=True)
     except Category.DoesNotExist:
         return api_error(
-            request,
-            key=ERROR_CODES.get("category_not_found", "category_not_found"),
+            code=ERROR_CODES.get("category_not_found", "category_not_found"),
+            message="Category not found",
             status=404,
         )
 
     if not Question.objects.filter(category=category, is_active=True).exists():
-        return api_error(
-            request,
-            key=ERROR_CODES.get("category_has_no_questions", "category_has_no_questions"),
-            status=400,
-        )
+        return JsonResponse({"error": "Category has no active questions"}, status=400)
 
     with transaction.atomic():
         session = GameSession.objects.select_for_update().get(pk=session.pk)
         if session.status != GameSession.Status.LOBBY:
             return api_error(
-                request,
-                key=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
+                code=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
+                message="Round can only be started from lobby",
                 status=400,
             )
 
@@ -313,8 +305,8 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
         )
         if not created:
             return api_error(
-                request,
-                key=ERROR_CODES.get("round_already_configured", "round_already_configured"),
+                code=ERROR_CODES.get("round_already_configured", "round_already_configured"),
+                message="Round already configured",
                 status=409,
             )
 
@@ -348,41 +340,21 @@ def show_question(request: HttpRequest, code: str) -> JsonResponse:
     try:
         session = GameSession.objects.get(code=session_code)
     except GameSession.DoesNotExist:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_found", "session_not_found"),
-            status=404,
-        )
+        return JsonResponse({"error": "Session not found"}, status=404)
 
     if session.host_id != request.user.id:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("host_only_show_question", "host_only_show_question"),
-            status=403,
-        )
+        return JsonResponse({"error": "Only host can show question"}, status=403)
 
     if session.status != GameSession.Status.LIE:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("show_question_invalid_phase", "show_question_invalid_phase"),
-            status=400,
-        )
+        return JsonResponse({"error": "Question can only be shown in lie phase"}, status=400)
 
     try:
         round_config = RoundConfig.objects.get(session=session, number=session.current_round)
     except RoundConfig.DoesNotExist:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("round_config_missing", "round_config_missing"),
-            status=400,
-        )
+        return JsonResponse({"error": "Round config missing"}, status=400)
 
     if RoundQuestion.objects.filter(session=session, round_number=session.current_round).exists():
-        return api_error(
-            request,
-            key=ERROR_CODES.get("question_already_shown", "question_already_shown"),
-            status=409,
-        )
+        return JsonResponse({"error": "Question already shown for this round"}, status=409)
 
     used_question_ids = RoundQuestion.objects.filter(session=session).values_list("question_id", flat=True)
     available_questions = Question.objects.filter(
@@ -391,11 +363,7 @@ def show_question(request: HttpRequest, code: str) -> JsonResponse:
     ).exclude(pk__in=used_question_ids)
 
     if not available_questions.exists():
-        return api_error(
-            request,
-            key=ERROR_CODES.get("no_available_questions", "no_available_questions"),
-            status=400,
-        )
+        return JsonResponse({"error": "No available questions in category"}, status=400)
 
     question = random.choice(list(available_questions))
     round_question = RoundQuestion.objects.create(
@@ -505,25 +473,13 @@ def mix_answers(request: HttpRequest, code: str, round_question_id: int) -> Json
     try:
         session = GameSession.objects.get(code=session_code)
     except GameSession.DoesNotExist:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_found", "session_not_found"),
-            status=404,
-        )
+        return JsonResponse({"error": "Session not found"}, status=404)
 
     if session.host_id != request.user.id:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("host_only_mix_answers", "host_only_mix_answers"),
-            status=403,
-        )
+        return JsonResponse({"error": "Only host can mix answers"}, status=403)
 
     if session.status not in {GameSession.Status.LIE, GameSession.Status.GUESS}:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("mix_answers_invalid_phase", "mix_answers_invalid_phase"),
-            status=400,
-        )
+        return JsonResponse({"error": "Answers can only be mixed in lie or guess phase"}, status=400)
 
     try:
         round_question = RoundQuestion.objects.get(
@@ -532,20 +488,12 @@ def mix_answers(request: HttpRequest, code: str, round_question_id: int) -> Json
             round_number=session.current_round,
         )
     except RoundQuestion.DoesNotExist:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("round_question_not_found", "round_question_not_found"),
-            status=404,
-        )
+        return JsonResponse({"error": "Round question not found"}, status=404)
 
     with transaction.atomic():
         locked_session = GameSession.objects.select_for_update().get(pk=session.pk)
         if locked_session.status not in {GameSession.Status.LIE, GameSession.Status.GUESS}:
-            return api_error(
-                request,
-                key=ERROR_CODES.get("mix_answers_invalid_phase", "mix_answers_invalid_phase"),
-                status=400,
-            )
+            return JsonResponse({"error": "Answers can only be mixed in lie or guess phase"}, status=400)
 
         locked_round_question = RoundQuestion.objects.select_for_update().get(pk=round_question.pk)
 
@@ -561,11 +509,7 @@ def mix_answers(request: HttpRequest, code: str, round_question_id: int) -> Json
                 deduped_answers.append(text.strip())
 
             if len(deduped_answers) < 2:
-                return api_error(
-                    request,
-                    key=ERROR_CODES.get("not_enough_answers_to_mix", "not_enough_answers_to_mix"),
-                    status=400,
-                )
+                return JsonResponse({"error": "Not enough answers to mix"}, status=400)
 
             random.shuffle(deduped_answers)
             locked_round_question.mixed_answers = deduped_answers

partyhub/settings.py

@@ -30,7 +30,6 @@ INSTALLED_APPS = [
 MIDDLEWARE = [
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
-    'django.middleware.locale.LocaleMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
@@ -90,12 +89,7 @@ AUTH_PASSWORD_VALIDATORS = [
     {'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator'},
 ]
 
-LANGUAGE_CODE = 'en'
-LANGUAGES = [
-    ('en', 'English'),
-    ('da', 'Danish'),
-]
-LOCALE_PATHS = [BASE_DIR / 'locale']
+LANGUAGE_CODE = 'da'
 TIME_ZONE = 'Europe/Copenhagen'
 USE_I18N = True
 USE_TZ = True
@@ -111,9 +105,6 @@ if USE_SPA_UI_RAW is None:
     USE_SPA_UI_RAW = env('WPP_SPA_ENABLED', 'false')
 USE_SPA_UI = USE_SPA_UI_RAW.lower() == 'true'
 WPP_SPA_ASSET_BASE = env('WPP_SPA_ASSET_BASE', '/static/frontend/angular/browser').rstrip('/')
-# Cache-busting token for SPA shell static asset URLs (querystring versioning).
-# Set to release id / commit SHA in deploy env for deterministic invalidation.
-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'))

scripts/check_i18n_drift.py

@@ -1,132 +0,0 @@
-#!/usr/bin/env python3
-"""Read-only drift check for shared i18n key coverage.
-
-Compares `shared/i18n/key-manifest.json` against `shared/i18n/lobby.json` and
-fails fast when keyspaces drift between frontend/backend contract sections.
-"""
-
-from __future__ import annotations
-
-import json
-from pathlib import Path
-import sys
-from typing import Any
-
-
-REPO_ROOT = Path(__file__).resolve().parents[1]
-CATALOG_PATH = REPO_ROOT / "shared" / "i18n" / "lobby.json"
-MANIFEST_PATH = REPO_ROOT / "shared" / "i18n" / "key-manifest.json"
-
-
-def _load_json(path: Path) -> dict[str, Any]:
-    with path.open("r", encoding="utf-8") as handle:
-        return json.load(handle)
-
-
-def _as_set(value: Any) -> set[str]:
-    if not isinstance(value, list):
-        return set()
-    return {str(item) for item in value}
-
-
-def _require_translations(
-    errors: dict[str, Any],
-    locales: set[str],
-    label: str,
-    failures: list[str],
-) -> None:
-    for key, translations in errors.items():
-        if not isinstance(translations, dict):
-            failures.append(f"{label}.{key} must be an object of locale->message")
-            continue
-
-        for locale in sorted(locales):
-            value = translations.get(locale)
-            if not isinstance(value, str) or not value.strip():
-                failures.append(f"{label}.{key} missing non-empty '{locale}' translation")
-
-
-def main() -> int:
-    catalog = _load_json(CATALOG_PATH)
-    manifest = _load_json(MANIFEST_PATH)
-
-    failures: list[str] = []
-
-    manifest_locales = _as_set(manifest.get("locales"))
-    catalog_locales = _as_set(catalog.get("locales", {}).get("supported"))
-    if manifest_locales != catalog_locales:
-        failures.append(
-            "locale set mismatch: "
-            f"manifest={sorted(manifest_locales)} catalog={sorted(catalog_locales)}"
-        )
-
-    frontend_manifest = _as_set(manifest.get("frontend_error_keys"))
-    frontend_catalog = set(catalog.get("frontend", {}).get("errors", {}).keys())
-    if frontend_manifest != frontend_catalog:
-        failures.append(
-            "frontend error key mismatch: "
-            f"manifest-only={sorted(frontend_manifest - frontend_catalog)} "
-            f"catalog-only={sorted(frontend_catalog - frontend_manifest)}"
-        )
-
-    backend_code_manifest = _as_set(manifest.get("backend_error_codes"))
-    backend_code_catalog = set(catalog.get("backend", {}).get("error_codes", {}).keys())
-    if backend_code_manifest != backend_code_catalog:
-        failures.append(
-            "backend error code mismatch: "
-            f"manifest-only={sorted(backend_code_manifest - backend_code_catalog)} "
-            f"catalog-only={sorted(backend_code_catalog - backend_code_manifest)}"
-        )
-
-    backend_key_manifest = _as_set(manifest.get("backend_error_keys"))
-    backend_key_catalog = set(catalog.get("backend", {}).get("errors", {}).keys())
-    if backend_key_manifest != backend_key_catalog:
-        failures.append(
-            "backend error key mismatch: "
-            f"manifest-only={sorted(backend_key_manifest - backend_key_catalog)} "
-            f"catalog-only={sorted(backend_key_catalog - backend_key_manifest)}"
-        )
-
-    backend_to_frontend = catalog.get("contract", {}).get("backend_to_frontend_error_keys", {})
-    if not isinstance(backend_to_frontend, dict):
-        failures.append("contract.backend_to_frontend_error_keys must be an object")
-        backend_to_frontend = {}
-
-    for code in sorted(backend_code_catalog):
-        frontend_key = backend_to_frontend.get(code)
-        if frontend_key is None:
-            failures.append(f"missing contract mapping for backend code '{code}'")
-            continue
-        if frontend_key not in frontend_catalog:
-            failures.append(
-                f"mapping for backend code '{code}' points to unknown frontend key '{frontend_key}'"
-            )
-
-    allowed_contract_only_codes = _as_set(manifest.get("allowed_contract_only_backend_codes"))
-    unknown_mapping_codes = set(backend_to_frontend.keys()) - backend_code_catalog
-    disallowed_unknown_mapping_codes = unknown_mapping_codes - allowed_contract_only_codes
-    if disallowed_unknown_mapping_codes:
-        failures.append(
-            "contract contains mappings for unknown backend codes: "
-            f"{sorted(disallowed_unknown_mapping_codes)}"
-        )
-
-    _require_translations(catalog.get("frontend", {}).get("errors", {}), manifest_locales, "frontend.errors", failures)
-    _require_translations(catalog.get("backend", {}).get("errors", {}), manifest_locales, "backend.errors", failures)
-
-    if failures:
-        print("i18n drift check FAILED")
-        for failure in failures:
-            print(f" - {failure}")
-        return 1
-
-    print("i18n drift check OK")
-    print(f" - locales: {sorted(manifest_locales)}")
-    print(f" - frontend error keys: {len(frontend_catalog)}")
-    print(f" - backend error codes: {len(backend_code_catalog)}")
-    print(f" - backend error keys: {len(backend_key_catalog)}")
-    return 0
-
-
-if __name__ == "__main__":
-    raise SystemExit(main())

shared/i18n/key-manifest.json

@@ -1,60 +0,0 @@
-{
-  "locales": ["en", "da"],
-  "frontend_error_keys": [
-    "join_failed",
-    "nickname_invalid",
-    "nickname_taken",
-    "session_code_required",
-    "session_fetch_failed",
-    "session_not_found",
-    "start_round_failed",
-    "unknown"
-  ],
-  "backend_error_codes": [
-    "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"
-  ],
-  "allowed_contract_only_backend_codes": [
-    "host_only_action"
-  ],
-  "backend_error_keys": [
-    "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"
-  ]
-}

shared/i18n/lobby.json

@@ -1,274 +1,14 @@
 {
-  "locales": {
-    "default": "en",
-    "supported": [
-      "en",
-      "da"
-    ]
-  },
   "frontend": {
     "errors": {
-      "session_code_required": {
-        "en": "Session code is required.",
-        "da": "Sessionskoden er påkrævet."
-      },
-      "session_fetch_failed": {
-        "en": "Could not load lobby status.",
-        "da": "Kunne ikke indlæse lobby-status."
-      },
-      "join_failed": {
-        "en": "Join failed. Check code or nickname and try again.",
-        "da": "Kunne ikke joine. Tjek kode eller kaldenavn og prøv igen."
-      },
-      "start_round_failed": {
-        "en": "Could not start round. Refresh the lobby and try again.",
-        "da": "Kunne ikke starte runden. Opdater lobbyen og prøv igen."
-      },
-      "session_not_found": {
-        "en": "Session code is invalid or the session no longer exists.",
-        "da": "Sessionskoden er ugyldig, eller sessionen findes ikke længere."
-      },
-      "nickname_invalid": {
-        "en": "Nickname must be between 2 and 40 characters.",
-        "da": "Kaldenavn skal være mellem 2 og 40 tegn."
-      },
-      "nickname_taken": {
-        "en": "Nickname is already taken.",
-        "da": "Kaldenavnet er allerede taget."
-      },
-      "unknown": {
-        "en": "Action failed. Refresh status and try again.",
-        "da": "Handlingen fejlede. Opdater status og prøv igen."
-      }
-    },
-    "ui": {
-      "common": {
-        "refresh": {
-          "en": "Refresh",
-          "da": "Opdatér"
-        },
-        "retry": {
-          "en": "Retry",
-          "da": "Prøv igen"
-        },
-        "back_to_join": {
-          "en": "Back to join",
-          "da": "Tilbage til join"
-        },
-        "session_code": {
-          "en": "Session code",
-          "da": "Sessionskode"
-        },
-        "status": {
-          "en": "Status",
-          "da": "Status"
-        },
-        "prompt": {
-          "en": "Prompt",
-          "da": "Spørgsmål"
-        },
-        "round_question_id": {
-          "en": "Round question id",
-          "da": "Rundespørgsmål-id"
-        },
-        "round": {
-          "en": "round",
-          "da": "runde"
-        },
-        "points_short": {
-          "en": "pts",
-          "da": "point"
-        },
-        "unknown_error": {
-          "en": "Unknown error",
-          "da": "Ukendt fejl"
-        }
-      },
-      "app": {
-        "title": {
-          "en": "WPP Angular Shell",
-          "da": "WPP Angular Shell"
-        },
-        "host_nav": {
-          "en": "Host",
-          "da": "Vært"
-        },
-        "player_nav": {
-          "en": "Player",
-          "da": "Spiller"
-        },
-        "language_label": {
-          "en": "Language",
-          "da": "Sprog"
-        }
-      },
-      "host": {
-        "title": {
-          "en": "Host gameplay flow",
-          "da": "Vært gameplay-flow"
-        },
-        "category": {
-          "en": "Category",
-          "da": "Kategori"
-        },
-        "start_round": {
-          "en": "Start round",
-          "da": "Start runde"
-        },
-        "show_question": {
-          "en": "Show question",
-          "da": "Vis spørgsmål"
-        },
-        "mix_answers": {
-          "en": "Mix answers → guess",
-          "da": "Bland svar → gæt"
-        },
-        "calculate_scores": {
-          "en": "Calculate scores → reveal",
-          "da": "Udregn score → afslør"
-        },
-        "load_scoreboard": {
-          "en": "Load scoreboard",
-          "da": "Hent scoreboard"
-        },
-        "start_next_round": {
-          "en": "Start next round",
-          "da": "Start næste runde"
-        },
-        "finish_game": {
-          "en": "Finish game",
-          "da": "Afslut spil"
-        },
-        "retry_scoreboard": {
-          "en": "Retry scoreboard",
-          "da": "Prøv scoreboard igen"
-        },
-        "retry_next_round": {
-          "en": "Retry next round",
-          "da": "Prøv næste runde igen"
-        },
-        "retry_finish": {
-          "en": "Retry finish game",
-          "da": "Prøv afslutning igen"
-        },
-        "session_refresh_failed": {
-          "en": "Session refresh failed",
-          "da": "Kunne ikke opdatere session"
-        },
-        "scoreboard_failed": {
-          "en": "Scoreboard failed",
-          "da": "Scoreboard fejlede"
-        },
-        "next_round_failed": {
-          "en": "Next round failed",
-          "da": "Næste runde fejlede"
-        },
-        "finish_game_failed": {
-          "en": "Finish game failed",
-          "da": "Afslutning fejlede"
-        },
-        "session_code_required": {
-          "en": "Session code is required",
-          "da": "Sessionskode er påkrævet"
-        },
-        "final_leaderboard": {
-          "en": "Final leaderboard",
-          "da": "Finale leaderboard"
-        },
-        "winner": {
-          "en": "Winner",
-          "da": "Vinder"
-        },
-        "audio_locale_hint": {
-          "en": "Host locale for audio references",
-          "da": "Værtens locale for lydreferencer"
-        }
-      },
-      "player": {
-        "title": {
-          "en": "Player gameplay flow",
-          "da": "Spiller gameplay-flow"
-        },
-        "nickname": {
-          "en": "Nickname",
-          "da": "Kaldenavn"
-        },
-        "join": {
-          "en": "Join",
-          "da": "Join"
-        },
-        "lie_label": {
-          "en": "Lie",
-          "da": "Løgn"
-        },
-        "submit_lie": {
-          "en": "Submit lie",
-          "da": "Send løgn"
-        },
-        "retry_lie_submit": {
-          "en": "Retry lie submit",
-          "da": "Prøv løgn igen"
-        },
-        "submit_guess": {
-          "en": "Submit guess",
-          "da": "Send gæt"
-        },
-        "retry_guess_submit": {
-          "en": "Retry guess submit",
-          "da": "Prøv gæt igen"
-        },
-        "final_leaderboard": {
-          "en": "Final leaderboard",
-          "da": "Finale leaderboard"
-        },
-        "reconnecting_text": {
-          "en": "Reconnecting… trying to refresh session state.",
-          "da": "Forbinder igen… prøver at opdatere session."
-        },
-        "offline_text": {
-          "en": "You are offline. Reconnect to continue gameplay.",
-          "da": "Du er offline. Forbind igen for at fortsætte."
-        },
-        "retry_now": {
-          "en": "Retry now",
-          "da": "Prøv nu"
-        },
-        "loading_refresh": {
-          "en": "Loading latest session state…",
-          "da": "Indlæser seneste session-status…"
-        },
-        "loading_join": {
-          "en": "Joining session… restoring your player state.",
-          "da": "Joiner session… gendanner spillerstatus."
-        },
-        "loading_submit_lie": {
-          "en": "Submitting lie… waiting for guess phase.",
-          "da": "Sender løgn… venter på gættefase."
-        },
-        "loading_submit_guess": {
-          "en": "Submitting guess… waiting for reveal.",
-          "da": "Sender gæt… venter på afsløring."
-        },
-        "session_refresh_failed": {
-          "en": "Session refresh failed",
-          "da": "Kunne ikke opdatere session"
-        },
-        "join_failed": {
-          "en": "Join failed",
-          "da": "Join fejlede"
-        },
-        "lie_submit_failed": {
-          "en": "Lie submit failed",
-          "da": "Løgn-fejl"
-        },
-        "guess_submit_failed": {
-          "en": "Guess submit failed",
-          "da": "Gætte-fejl"
-        }
-      }
-    },
-    "capabilities": {
-      "client_has_no_audio_output": true
+      "session_code_required": "Session code is required.",
+      "session_fetch_failed": "Could not load lobby status.",
+      "join_failed": "Join failed. Check code or nickname and try again.",
+      "start_round_failed": "Could not start round. Refresh the lobby and try again.",
+      "session_not_found": "Session code is invalid or the session no longer exists.",
+      "nickname_invalid": "Nickname must be between 2 and 40 characters.",
+      "nickname_taken": "Nickname is already taken.",
+      "unknown": "Action failed. Refresh status and try again."
     }
   },
   "backend": {
@@ -281,138 +21,7 @@
       "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",
-      "show_question_invalid_phase": "show_question_invalid_phase",
-      "round_config_missing": "round_config_missing",
-      "question_already_shown": "question_already_shown",
-      "no_available_questions": "no_available_questions",
-      "mix_answers_invalid_phase": "mix_answers_invalid_phase",
-      "round_question_not_found": "round_question_not_found",
-      "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"
-    },
-    "errors": {
-      "session_code_required": {
-        "en": "Session code is required",
-        "da": "Sessionskode er påkrævet"
-      },
-      "nickname_invalid": {
-        "en": "Nickname must be between 2 and 40 characters",
-        "da": "Kaldenavn skal være mellem 2 og 40 tegn"
-      },
-      "session_not_found": {
-        "en": "Session not found",
-        "da": "Session blev ikke fundet"
-      },
-      "session_not_joinable": {
-        "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"
-      },
-      "show_question_invalid_phase": {
-        "en": "Question can only be shown in lie phase",
-        "da": "Spørgsmålet kan kun vises i løgnefasen"
-      },
-      "round_config_missing": {
-        "en": "Round config missing",
-        "da": "Rundekonfiguration mangler"
-      },
-      "question_already_shown": {
-        "en": "Question already shown for this round",
-        "da": "Spørgsmålet er allerede vist for denne runde"
-      },
-      "no_available_questions": {
-        "en": "No available questions in category",
-        "da": "Ingen tilgængelige spørgsmål i kategorien"
-      },
-      "mix_answers_invalid_phase": {
-        "en": "Answers can only be mixed in lie or guess phase",
-        "da": "Svar kan kun blandes i løgne- eller gættefasen"
-      },
-      "round_question_not_found": {
-        "en": "Round question not found",
-        "da": "Rundespørgsmål blev ikke fundet"
-      },
-      "not_enough_answers_to_mix": {
-        "en": "Not enough answers to mix",
-        "da": "Ikke nok svar at blande"
-      },
-      "host_only_start_round": {
-        "en": "Only host can start round",
-        "da": "Kun værten kan starte runden"
-      },
-      "host_only_show_question": {
-        "en": "Only host can show question",
-        "da": "Kun værten kan vise spørgsmålet"
-      },
-      "host_only_mix_answers": {
-        "en": "Only host can mix answers",
-        "da": "Kun værten kan blande svar"
-      }
-    }
-  },
-  "contract": {
-    "ownership": {
-      "artifact": "shared/i18n/lobby.json",
-      "backend": "lobby/* reads backend/errors + backend/error_codes",
-      "frontend": "frontend/* reads frontend/errors + frontend/ui + contract/backend_to_frontend_error_keys"
-    },
-    "locale": {
-      "default": "en",
-      "supported": [
-        "en",
-        "da"
-      ],
-      "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",
-      "nickname_invalid": "nickname_invalid",
-      "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",
-      "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"
+      "round_already_configured": "round_already_configured"
     }
   }
 }