test(angular): cover host/player gameplay transitions and retry paths

2026-03-01 14:40:12 +00:00
38 changed files with 165 additions and 3428 deletions
--- a/.gitea/workflows/ci.yml
+++ b/.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
--- a/docs/ISSUE-180-SPA-NEXT-ROUND-FINAL-LEADERBOARD-EVIDENCE.md
+++ b/docs/ISSUE-180-SPA-NEXT-ROUND-FINAL-LEADERBOARD-EVIDENCE.md
@@ -1,28 +0,0 @@
-# Issue #180 Evidence — SPA next-round + final leaderboard
-
-## Flow log (Angular SPA)
-1. Host reaches `reveal` phase and runs `loadScoreboard()` (`GET /lobby/sessions/:code/scoreboard`).
-2. Host can start next round directly in SPA via `startNextRound()` (`POST /lobby/sessions/:code/rounds/next`) and then session hydrate (`GET /lobby/sessions/:code`) without page reload.
-3. Host can finish game directly in SPA via `finishGame()` (`POST /lobby/sessions/:code/finish`), rendering winner + sorted final leaderboard (plus raw payload for debug) in the same shell.
-4. Player SPA renders final leaderboard from refreshed finished-session payload (sorted by score desc, nickname tiebreak) without leaving SPA route.
-5. Error/retry paths are implemented and covered:
-   - scoreboard failure -> `scoreboardError` + retry button
-   - next-round failure -> `nextRoundError` + retry button
-   - finish-game/final-leaderboard failure -> `finishError` + retry button
-
-## Test evidence
-### `frontend/angular` (Vitest)
- `src/app/features/host/host-shell.component.spec.ts`
-  - `runs next-round transition without reload and clears scoreboard payload`
-  - `captures finish-game failure for retry and stores final leaderboard on success`
- `src/app/features/player/player-shell.component.spec.ts`
-  - `builds final leaderboard in finished status without legacy page hop`
-
-Result:
- Test Files: 2 passed
- Tests: 9 passed
-
-### `frontend` shared SPA tests (regression)
-Result:
- Test Files: 5 passed
- Tests: 24 passed
--- a/docs/ISSUE-205-I18N-FOUNDATION.md
+++ b/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.
--- a/docs/STAGING_GAMEPLAY_SMOKE_ARTIFACT.md
+++ b/docs/STAGING_GAMEPLAY_SMOKE_ARTIFACT.md
@@ -22,20 +22,13 @@ Formål: levere et lille, ensartet evidensformat for release-nær gameplay-smoke
 - Host authenticated in Django admin: <yes/no>
 - Active category/questions present: <yes/no>
 - Participants: host + <N> players
- `USE_SPA_UI`: <on/off>
- 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)
-1. Cutover route sanity
-   - Flag OFF serves legacy UI templates: <pass/fail>
-   - Flag ON serves SPA shell on expected path(s): <pass/fail>
-2. Lobby -> join -> start
+1. Lobby -> join -> start
   - Mixed-case + whitespace session code accepted: <pass/fail>
-3. One full round to scoreboard
+2. One full round to scoreboard
   - submit lie -> mix -> submit guess -> calculate score -> show scoreboard: <pass/fail>
-4. Next-round + game-end sanity
+3. Next-round + game-end sanity
   - next round transitions: <pass/fail>
   - final leaderboard visible: <pass/fail>

--- a/docs/UI_SMOKE.md
+++ b/docs/UI_SMOKE.md
@@ -4,20 +4,15 @@
 - Host er logget ind i Django.
 - Mindst én aktiv kategori med spørgsmål findes.

-## Cutover-forudsætning (`USE_SPA_UI`)
- `USE_SPA_UI=false` (default): brug legacy routes `/lobby/ui/host` + `/lobby/ui/player`.
- `USE_SPA_UI=true`: host må gerne testes på SPA deep-link route `/lobby/ui/host/<spa-path>` (fx `/lobby/ui/host/guess`), player på `/lobby/ui/player`.
-
 ## Flow
-1. Verificér cutover-route matcher valgt flag (legacy vs SPA shell).
-2. Åbn host-siden og tryk Opret session.
-3. Åbn player-siden i 3 faner/enheder.
-4. Join alle spillere med sessionkode og nickname.
-5. Host: vælg kategori, Start runde, Vis spørgsmål.
-6. Spillere: brug round_question_id og submit løgn.
-7. Host: Mix svar.
-8. Spillere: submit gæt.
-9. Host: Beregn score og Vis scoreboard.
-10. Host: Næste runde eller Afslut spil.
+1. Åbn host-siden på /lobby/ui/host og tryk Opret session.
+2. Åbn player-siden i 3 faner/enheder på /lobby/ui/player.
+3. Join alle spillere med sessionkode og nickname.
+4. Host: vælg kategori, Start runde, Vis spørgsmål.
+5. Spillere: brug round_question_id og submit løgn.
+6. Host: Mix svar.
+7. Spillere: submit gæt.
+8. Host: Beregn score og Vis scoreboard.
+9. Host: Næste runde eller Afslut spil.

 Resultat: En fuld runde kan køres uden rå API-kald fra terminal.
--- a/docs/issue-180-flow-log.md
+++ b/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
--- a/docs/spa-cutover-flag.md
+++ b/docs/spa-cutover-flag.md
@@ -15,6 +15,4 @@ Backward compatibility under cutover:
 ## 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`
- Flag ON (host deep-link): `UiScreenTests.test_host_screen_deeplink_preserves_spa_path_when_feature_flag_enabled`
 - Flag ON (player): `UiScreenTests.test_player_screen_can_render_angular_shell_when_feature_flag_enabled`
- Smoke-checkliste for cutover paths: `docs/STAGING_GAMEPLAY_SMOKE_ARTIFACT.md` + `docs/UI_SMOKE.md`
--- a/frontend/angular/src/app/api-contract-smoke.spec.ts
+++ b/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 }
-    );
-  });
-});
--- a/frontend/angular/src/app/app.component.css
+++ b/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; }
--- a/frontend/angular/src/app/app.component.html
+++ b/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>
--- a/frontend/angular/src/app/app.component.ts
+++ b/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);
-  }
 }
--- a/frontend/angular/src/app/app.routes.ts
+++ b/frontend/angular/src/app/app.routes.ts
@@ -1,47 +1,28 @@
 import { Routes } from '@angular/router';

-import {
-  hostRouteContextResolver,
-  hostRouteGuard,
-  playerRouteContextResolver,
-  playerRouteGuard,
-} from './session-route-context';
-
 export const routes: Routes = [
  {
    path: 'host',
-    resolve: { routeContext: hostRouteContextResolver },
-    canActivate: [hostRouteGuard],
    loadComponent: () => import('./features/host/host-shell.component').then((m) => m.HostShellComponent),
  },
  {
    path: 'host/:phase',
-    resolve: { routeContext: hostRouteContextResolver },
-    canActivate: [hostRouteGuard],
    loadComponent: () => import('./features/host/host-shell.component').then((m) => m.HostShellComponent),
  },
  {
    path: 'host/:phase/:context',
-    resolve: { routeContext: hostRouteContextResolver },
-    canActivate: [hostRouteGuard],
    loadComponent: () => import('./features/host/host-shell.component').then((m) => m.HostShellComponent),
  },
  {
    path: 'player',
-    resolve: { routeContext: playerRouteContextResolver },
-    canActivate: [playerRouteGuard],
    loadComponent: () => import('./features/player/player-shell.component').then((m) => m.PlayerShellComponent),
  },
  {
    path: 'player/:phase',
-    resolve: { routeContext: playerRouteContextResolver },
-    canActivate: [playerRouteGuard],
    loadComponent: () => import('./features/player/player-shell.component').then((m) => m.PlayerShellComponent),
  },
  {
    path: 'player/:phase/:context',
-    resolve: { routeContext: playerRouteContextResolver },
-    canActivate: [playerRouteGuard],
    loadComponent: () => import('./features/player/player-shell.component').then((m) => m.PlayerShellComponent),
  },
  { path: '', pathMatch: 'full', redirectTo: 'player' },
--- a/frontend/angular/src/app/features/host/host-shell.component.spec.ts
+++ b/frontend/angular/src/app/features/host/host-shell.component.spec.ts
@@ -12,60 +12,6 @@ function jsonResponse(status: number, body: unknown) {
  } as unknown as Response;
 }

-function sessionDetailPayload(status: string, options?: { roundQuestionId?: number | null }) {
-  const roundQuestionId = options?.roundQuestionId ?? 41;
-
-  return {
-    session: {
-      code: 'ABCD12',
-      status,
-      host_id: 1,
-      current_round: status === 'lobby' ? 2 : 1,
-      players_count: 2,
-    },
-    round_question:
-      roundQuestionId === null
-        ? null
-        : {
-            id: roundQuestionId,
-            round_number: 1,
-            prompt: 'Q?',
-            shown_at: '2026-01-01T00:00:00Z',
-            answers: [],
-          },
-    players: [
-      { id: 1, nickname: 'Host', score: 0, is_connected: true },
-      { id: 2, nickname: 'Mads', score: 120, is_connected: true },
-    ],
-    phase_view_model: {
-      status,
-      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: status === 'lobby',
-        can_show_question: status === 'lie',
-        can_mix_answers: status === 'lie',
-        can_calculate_scores: status === 'guess',
-        can_reveal_scoreboard: status === 'reveal',
-        can_start_next_round: status === 'scoreboard',
-        can_finish_game: status === 'scoreboard',
-      },
-      player: {
-        can_join: status === 'lobby',
-        can_submit_lie: status === 'lie',
-        can_submit_guess: status === 'guess',
-        can_view_final_result: status === 'finished',
-      },
-    },
-  };
-}
-
 describe('HostShellComponent gameplay wiring', () => {
  afterEach(() => {
    vi.restoreAllMocks();
@@ -74,13 +20,14 @@ describe('HostShellComponent gameplay wiring', () => {
  it('runs startRound transition and refreshes session details', async () => {
    const fetchMock: FetchMock = vi
      .fn()
+      .mockResolvedValueOnce(jsonResponse(201, { ok: true }))
      .mockResolvedValueOnce(
-        jsonResponse(201, {
-          session: { code: 'ABCD12', status: 'lie', current_round: 1 },
-          round: { number: 1, category: { slug: 'history', name: 'History' } },
+        jsonResponse(200, {
+          session: { code: 'ABCD12', status: 'lie', current_round: 2 },
+          round_question: { id: 41, prompt: 'Q?', answers: [] },
+          players: [],
        })
-      )
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('lie')));
+      );

    vi.stubGlobal('fetch', fetchMock);

@@ -95,14 +42,20 @@ describe('HostShellComponent gameplay wiring', () => {
      '/lobby/sessions/ABCD12/rounds/start',
      expect.objectContaining({ method: 'POST', body: JSON.stringify({ category_slug: 'history' }) })
    );
-    expect(fetchMock).toHaveBeenNthCalledWith(2, '/lobby/sessions/ABCD12', expect.objectContaining({ method: 'GET' }));
+    expect(fetchMock).toHaveBeenNthCalledWith(
+      2,
+      '/lobby/sessions/ABCD12',
+      expect.objectContaining({ method: 'GET' })
+    );
    expect(component.session?.session.status).toBe('lie');
    expect(component.roundQuestionId).toBe('41');
    expect(component.loading).toBe(false);
  });

  it('captures scoreboard error for retry path', async () => {
-    const fetchMock: FetchMock = vi.fn().mockResolvedValue(jsonResponse(500, { error: 'Scoreboard unavailable' }));
+    const fetchMock: FetchMock = vi.fn().mockResolvedValue(
+      jsonResponse(500, { error: 'Scoreboard unavailable' })
+    );

    vi.stubGlobal('fetch', fetchMock);

@@ -111,156 +64,11 @@ describe('HostShellComponent gameplay wiring', () => {

    await component.loadScoreboard();

-    expect(fetchMock).toHaveBeenCalledWith('/lobby/sessions/ABCD12/scoreboard', expect.objectContaining({ method: 'GET' }));
+    expect(fetchMock).toHaveBeenCalledWith(
+      '/lobby/sessions/ABCD12/scoreboard',
+      expect.objectContaining({ method: 'GET' })
+    );
    expect(component.scoreboardError).toContain('Scoreboard failed: Scoreboard unavailable');
    expect(component.loading).toBe(false);
  });
-
-  it('wires showQuestion, mixAnswers and calculateScores with expected request payloads', async () => {
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(
-        jsonResponse(200, {
-          round_question: {
-            id: 77,
-            round_number: 1,
-            prompt: 'Q?',
-            shown_at: '2026-01-01T00:00:00Z',
-            lie_deadline_at: '2026-01-01T00:00:45Z',
-          },
-          config: { lie_seconds: 45 },
-        })
-      )
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('lie', { roundQuestionId: 77 })))
-      .mockResolvedValueOnce(
-        jsonResponse(200, {
-          session: { code: 'ABCD12', status: 'guess', current_round: 1 },
-          round_question: { id: 77, round_number: 1 },
-          answers: [{ text: 'A' }],
-        })
-      )
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('guess', { roundQuestionId: 77 })))
-      .mockResolvedValueOnce(
-        jsonResponse(200, {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
-          round_question: { id: 77, round_number: 1 },
-          events_created: 2,
-          leaderboard: [{ id: 1, nickname: 'Luna', score: 320 }],
-        })
-      )
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('reveal', { roundQuestionId: 77 })));
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new HostShellComponent();
-    component.sessionCode = ' abcd12 ';
-    component.roundQuestionId = ' 77 ';
-
-    await component.showQuestion();
-    await component.mixAnswers();
-    await component.calculateScores();
-
-    expect(component.error).toBe('');
-    expect(component.loading).toBe(false);
-  });
-
-  it('runs next-round transition without reload and clears scoreboard payload', async () => {
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(jsonResponse(200, { session: { code: 'ABCD12', status: 'lobby', current_round: 2 } }))
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('lobby', { roundQuestionId: null })));
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new HostShellComponent();
-    component.sessionCode = ' abcd12 ';
-    component.scoreboardPayload = '{"leaderboard":[]}';
-    component.finalLeaderboardPayload = '{"leaderboard":[{"nickname":"Old","score":1}]}' ;
-    component.finalLeaderboard = [{ id: 9, nickname: 'Old', score: 1 }];
-
-    await component.startNextRound();
-
-    expect(fetchMock).toHaveBeenNthCalledWith(
-      1,
-      '/lobby/sessions/ABCD12/rounds/next',
-      expect.objectContaining({ method: 'POST', body: JSON.stringify({}) })
-    );
-    expect(fetchMock).toHaveBeenNthCalledWith(2, '/lobby/sessions/ABCD12', expect.objectContaining({ method: 'GET' }));
-    expect(component.session?.session.status).toBe('lobby');
-    expect(component.scoreboardPayload).toBe('');
-    expect(component.finalLeaderboardPayload).toBe('');
-    expect(component.finalLeaderboard).toEqual([]);
-    expect(component.nextRoundError).toBe('');
-  });
-
-  it('captures finish-game failure for retry and stores final leaderboard on success', async () => {
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(jsonResponse(503, { error: 'Final leaderboard timeout' }))
-      .mockResolvedValueOnce(
-        jsonResponse(200, {
-          session: { code: 'ABCD12', status: 'finished', current_round: 2 },
-          winner: { id: 1, nickname: 'Luna', score: 320 },
-          leaderboard: [
-            { id: 2, nickname: 'Mads', score: 120 },
-            { id: 1, nickname: 'Luna', score: 320 },
-          ],
-        })
-      )
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('finished', { roundQuestionId: null })));
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new HostShellComponent();
-    component.sessionCode = 'ABCD12';
-
-    await component.finishGame();
-    expect(component.finishError).toContain('Finish game failed: Final leaderboard timeout');
-
-    await component.finishGame();
-
-    expect(fetchMock).toHaveBeenNthCalledWith(
-      2,
-      '/lobby/sessions/ABCD12/finish',
-      expect.objectContaining({ method: 'POST', body: JSON.stringify({}) })
-    );
-    expect(component.finishError).toBe('');
-    expect(component.finalLeaderboardPayload).toContain('"status": "finished"');
-    expect(component.finalWinner?.nickname).toBe('Luna');
-    expect(component.finalLeaderboard.map((entry) => entry.nickname)).toEqual(['Luna', 'Mads']);
-  });
-
-  it('guards next-round and finish actions when session code is missing', async () => {
-    const fetchMock: FetchMock = vi.fn();
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new HostShellComponent();
-    component.sessionCode = '   ';
-
-    await component.startNextRound();
-    await component.finishGame();
-
-    expect(fetchMock).not.toHaveBeenCalled();
-    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');
-  });
 });
--- a/frontend/angular/src/app/features/host/host-shell.component.ts
+++ b/frontend/angular/src/app/features/host/host-shell.component.ts
@@ -1,133 +1,60 @@
 import { CommonModule } from '@angular/common';
-import { Component, OnDestroy, OnInit } from '@angular/core';
+import { Component } 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';
-
 interface SessionDetail {
  session: { code: string; status: string; current_round: number };
  round_question: { id: number; prompt: string; answers: Array<{ text: string }> } | null;
  players: Array<{ id: number; nickname: string; score: number }>;
 }

-type LeaderboardEntry = ScoreboardResponse['leaderboard'][number];
-type LeaderboardResponse = FinishGameResponse;
-
@Component({
  selector: 'app-host-shell',
  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 *ngIf="scoreboardError" (click)="loadScoreboard()" [disabled]="loading">Retry scoreboard</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 }} pts)</p>
-        <ol>
-          <li *ngFor="let entry of finalLeaderboard">{{ entry.nickname }}: {{ entry.score }}</li>
-        </ol>
-      </div>
-      <pre *ngIf="finalLeaderboardPayload">{{ finalLeaderboardPayload }}</pre>
    </div>
  `,
 })
-export class HostShellComponent implements OnInit, OnDestroy {
-  locale = resolvePreferredLocale();
-  readonly clientHasNoAudioOutput = clientHasNoAudioOutput;
-
+export class HostShellComponent {
  sessionCode = '';
  categorySlug = 'general';
  roundQuestionId = '';
  loading = false;
  error = '';
  scoreboardError = '';
-  nextRoundError = '';
-  finishError = '';
  scoreboardPayload = '';
-  finalLeaderboardPayload = '';
-  finalLeaderboard: LeaderboardEntry[] = [];
-  finalWinner: LeaderboardEntry | null = null;
  session: SessionDetail | null = null;

-  private readonly api = createApiClient();
-  private readonly controller = createVerticalSliceController(this.api);
-  private unsubscribeLocale: (() => void) | null = null;
-
-  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 storedCode = window.sessionStorage.getItem('wpp.host-session-code') ?? '';
-    const candidate = codeFromRoute || storedCode;
-
-    if (!candidate) {
-      return;
-    }
-
-    this.sessionCode = this.normalizeCode(candidate);
-    this.persistSessionCode(this.sessionCode);
-    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();
  }

-  private persistSessionCode(code: string): void {
-    if (typeof window !== 'undefined') {
-      window.sessionStorage.setItem('wpp.host-session-code', code);
-    }
-  }
-
  private async request<T>(path: string, method: 'GET' | 'POST', payload?: unknown): Promise<T> {
    const response = await fetch(path, {
      method,
@@ -151,23 +78,13 @@ export class HostShellComponent implements OnInit, OnDestroy {
    this.loading = true;
    this.error = '';
    this.scoreboardError = '';
-    this.nextRoundError = '';
-    this.finishError = '';
    try {
-      const state = await this.controller.hydrateLobby(this.sessionCode);
-      if (!state.session || state.errorMessage) {
-        throw new Error(state.errorMessage ?? 'Unknown error');
-      }
-      this.session = state.session as SessionDetail;
+      const code = this.normalizeCode(this.sessionCode);
+      this.session = await this.request<SessionDetail>(`/lobby/sessions/${encodeURIComponent(code)}`, 'GET');
      this.sessionCode = this.session.session.code;
-      this.persistSessionCode(this.sessionCode);
      this.roundQuestionId = this.session.round_question?.id ? String(this.session.round_question.id) : '';
-      if (this.session.session.status !== 'finished') {
-        this.resetFinalLeaderboard();
-      }
-      this.syncRouteFromSession();
    } catch (error) {
-      this.error = `${this.copy('host.session_refresh_failed')}: ${(error as Error).message}`;
+      this.error = `Session refresh failed: ${(error as Error).message}`;
    } finally {
      this.loading = false;
    }
@@ -175,17 +92,11 @@ export class HostShellComponent implements OnInit, OnDestroy {

  async startRound(): Promise<void> {
    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 ?? '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) : '';
-      this.scoreboardPayload = '';
-      this.resetFinalLeaderboard();
-      this.syncRouteFromSession();
+      const code = this.normalizeCode(this.sessionCode);
+      await this.request(`/lobby/sessions/${encodeURIComponent(code)}/rounds/start`, 'POST', {
+        category_slug: this.categorySlug.trim(),
+      });
+      await this.refreshSession();
    });
  }

@@ -225,83 +136,12 @@ 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;
    }
  }

-  async startNextRound(): Promise<void> {
-    this.loading = true;
-    this.nextRoundError = '';
-    this.error = '';
-    try {
-      const code = this.normalizeCode(this.sessionCode);
-      if (!code) {
-        throw new Error(this.copy('host.session_code_required'));
-      }
-      await this.request(`/lobby/sessions/${encodeURIComponent(code)}/rounds/next`, 'POST', {});
-      this.scoreboardPayload = '';
-      this.resetFinalLeaderboard();
-      await this.refreshSession();
-    } catch (error) {
-      this.nextRoundError = `${this.copy('host.next_round_failed')}: ${(error as Error).message}`;
-    } finally {
-      this.loading = false;
-    }
-  }
-
-  async finishGame(): Promise<void> {
-    this.loading = true;
-    this.finishError = '';
-    this.error = '';
-    try {
-      const code = this.normalizeCode(this.sessionCode);
-      if (!code) {
-        throw new Error(this.copy('host.session_code_required'));
-      }
-      const payload = await this.request<LeaderboardResponse>(`/lobby/sessions/${encodeURIComponent(code)}/finish`, 'POST', {});
-      this.finalLeaderboardPayload = JSON.stringify(payload, null, 2);
-      this.finalLeaderboard = [...payload.leaderboard].sort((a, b) => {
-        if (b.score !== a.score) {
-          return b.score - a.score;
-        }
-        return a.nickname.localeCompare(b.nickname);
-      });
-      this.finalWinner = payload.winner ?? this.finalLeaderboard[0] ?? null;
-      await this.refreshSession();
-    } catch (error) {
-      this.finishError = `${this.copy('host.finish_game_failed')}: ${(error as Error).message}`;
-    } finally {
-      this.loading = false;
-    }
-  }
-
-  private resetFinalLeaderboard(): void {
-    this.finalLeaderboardPayload = '';
-    this.finalLeaderboard = [];
-    this.finalWinner = null;
-  }
-
-  private syncRouteFromSession(): void {
-    if (!this.session) {
-      return;
-    }
-
-    const phase = this.session.session.status || 'lobby';
-    const code = this.normalizeCode(this.session.session.code || this.sessionCode);
-    if (!code) {
-      return;
-    }
-
-    const targetPath = `#/host/${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 = '';
--- a/frontend/angular/src/app/features/player/player-shell.component.spec.ts
+++ b/frontend/angular/src/app/features/player/player-shell.component.spec.ts
@@ -12,70 +12,17 @@ function jsonResponse(status: number, body: unknown) {
  } as unknown as Response;
 }

-function sessionDetailPayload(status: string, options?: { answers?: string[]; players?: Array<{ id: number; nickname: string; score: number }>; roundQuestionId?: number | null }) {
-  const answers = options?.answers ?? [];
-  const roundQuestionId = options?.roundQuestionId ?? 11;
-
-  return {
-    session: {
-      code: 'ABCD12',
-      status,
-      host_id: null,
-      current_round: 1,
-      players_count: (options?.players ?? []).length,
-    },
-    round_question:
-      roundQuestionId === null
-        ? null
-        : {
-            id: roundQuestionId,
-            round_number: 1,
-            prompt: 'Q?',
-            shown_at: '2026-01-01T00:00:00Z',
-            answers: answers.map((text) => ({ text })),
-          },
-    players: (options?.players ?? []).map((player) => ({
-      ...player,
-      is_connected: true,
-    })),
-    phase_view_model: {
-      status,
-      round_number: 1,
-      players_count: (options?.players ?? []).length,
-      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: status === 'lobby',
-        can_submit_lie: status === 'lie',
-        can_submit_guess: status === 'guess',
-        can_view_final_result: status === 'finished',
-      },
-    },
-  };
-}
-
 describe('PlayerShellComponent gameplay wiring', () => {
  afterEach(() => {
-    vi.useRealTimers();
    vi.restoreAllMocks();
  });

  it('clears selected guess when refreshed status is no longer guess', async () => {
    const fetchMock: FetchMock = vi.fn().mockResolvedValue(
-      jsonResponse(200, sessionDetailPayload('reveal', { answers: ['A'] }))
+      jsonResponse(200, {
+        session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
+        round_question: { id: 11, prompt: 'Q?', answers: [{ text: 'A' }] },
+      })
    );

    vi.stubGlobal('fetch', fetchMock);
@@ -97,8 +44,13 @@ describe('PlayerShellComponent gameplay wiring', () => {
    const fetchMock: FetchMock = vi
      .fn()
      .mockResolvedValueOnce(jsonResponse(500, { error: 'Temporary submit outage' }))
-      .mockResolvedValueOnce(jsonResponse(201, { lie: { id: 1, player_id: 9, round_question_id: 11, text: 'my lie', created_at: '2026-01-01T00:00:01Z' }, window: { lie_deadline_at: '2026-01-01T00:00:45Z' } }))
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('guess', { answers: ['A', 'B'] })));
+      .mockResolvedValueOnce(jsonResponse(200, { ok: true }))
+      .mockResolvedValueOnce(
+        jsonResponse(200, {
+          session: { code: 'ABCD12', status: 'guess', current_round: 1 },
+          round_question: { id: 11, prompt: 'Q?', answers: [{ text: 'A' }, { text: 'B' }] },
+        })
+      );

    vi.stubGlobal('fetch', fetchMock);

@@ -110,19 +62,10 @@ describe('PlayerShellComponent gameplay wiring', () => {
    component.session = {
      session: { code: 'ABCD12', status: 'lie', current_round: 1 },
      round_question: { id: 11, prompt: 'Q?', answers: [] },
-      players: [],
    };

    await component.submitLie();

-    expect(fetchMock).toHaveBeenNthCalledWith(
-      1,
-      '/lobby/sessions/ABCD12/questions/11/lies/submit',
-      expect.objectContaining({
-        method: 'POST',
-        body: JSON.stringify({ player_id: 9, session_token: 'token-1', text: 'my lie' }),
-      })
-    );
    expect(component.submitError?.kind).toBe('lie');
    expect(component.submitError?.message).toContain('Lie submit failed: Temporary submit outage');

@@ -132,222 +75,4 @@ describe('PlayerShellComponent gameplay wiring', () => {
    expect(component.session?.session.status).toBe('guess');
    expect(fetchMock).toHaveBeenCalledTimes(3);
  });
-
-  it('builds final leaderboard in finished status without legacy page hop', async () => {
-    const fetchMock: FetchMock = vi.fn().mockResolvedValue(
-      jsonResponse(
-        200,
-        sessionDetailPayload('finished', {
-          roundQuestionId: null,
-          players: [
-            { id: 2, nickname: 'Mads', score: 150 },
-            { id: 1, nickname: 'Luna', score: 320 },
-          ],
-        })
-      )
-    );
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = 'ABCD12';
-
-    await component.refreshSession();
-
-    expect(component.finalLeaderboard.map((entry) => entry.nickname)).toEqual(['Luna', 'Mads']);
-  });
-
-  it('surfaces guess submit error and retries with selected answer payload', async () => {
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(jsonResponse(503, { error: 'Guess queue busy' }))
-      .mockResolvedValueOnce(jsonResponse(201, { guess: { id: 2, player_id: 9, round_question_id: 11, selected_text: 'B', is_correct: false, fooled_player_id: 3, created_at: '2026-01-01T00:00:10Z' }, window: { guess_deadline_at: '2026-01-01T00:01:30Z' } }))
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('reveal', { answers: ['A', 'B'] })));
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = ' abcd12 ';
-    component.playerId = 9;
-    component.sessionToken = 'token-1';
-    component.selectedGuess = 'B';
-    component.session = {
-      session: { code: 'ABCD12', status: 'guess', current_round: 1 },
-      round_question: { id: 11, prompt: 'Q?', answers: [{ text: 'A' }, { text: 'B' }] },
-      players: [],
-    };
-
-    await component.submitGuess();
-
-    expect(fetchMock).toHaveBeenNthCalledWith(
-      1,
-      '/lobby/sessions/ABCD12/questions/11/guesses/submit',
-      expect.objectContaining({
-        method: 'POST',
-        body: JSON.stringify({ player_id: 9, session_token: 'token-1', selected_text: 'B' }),
-      })
-    );
-    expect(component.submitError?.kind).toBe('guess');
-    expect(component.submitError?.message).toContain('Guess submit failed: Guess queue busy');
-
-    await component.submitGuess();
-
-    expect(component.submitError).toBeNull();
-    expect(component.session?.session.status).toBe('reveal');
-    expect(component.selectedGuess).toBe('');
-    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 });
-
-    const fetchMock: FetchMock = vi.fn().mockRejectedValueOnce(new TypeError('Failed to fetch'));
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = 'ABCD12';
-
-    await component.refreshSession();
-
-    expect(component.connectionState === 'reconnecting' || component.connectionState === 'online').toBe(true);
-    expect(component.error).toContain('Session refresh failed:');
-  });
-
-  it('uses offline state when browser reports disconnected network', async () => {
-    vi.stubGlobal('navigator', { onLine: false });
-
-    const fetchMock: FetchMock = vi.fn().mockRejectedValue(new TypeError('Failed to fetch'));
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = 'ABCD12';
-
-    await component.refreshSession();
-
-    expect(component.connectionState).toBe('offline');
-    expect(component.error).toContain('Session refresh failed');
-  });
-
-  it('tracks loading transition message for join action', async () => {
-    let resolveJoin: ((value: Response) => void) | null = null;
-    const fetchMock: FetchMock = vi.fn().mockImplementation(
-      () =>
-        new Promise<Response>((resolve) => {
-          resolveJoin = resolve;
-        })
-    );
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = 'ABCD12';
-    component.nickname = 'Luna';
-
-    const joinPromise = component.joinSession();
-
-    expect(component.loading).toBe(true);
-    expect(component.loadingMessage).toBe('Joining session… restoring your player state.');
-
-    resolveJoin?.(jsonResponse(201, sessionDetailPayload('lobby', { roundQuestionId: null })));
-    await joinPromise;
-
-    expect(component.loading).toBe(false);
-    expect(component.loadingTransition).toBeNull();
-  });
-
-  it('returnToJoin clears persisted session context and transient state', () => {
-    const values = new Map<string, string>();
-    const localStorage = {
-      getItem: vi.fn((key: string) => values.get(key) ?? null),
-      setItem: vi.fn((key: string, value: string) => {
-        values.set(key, value);
-      }),
-      removeItem: vi.fn((key: string) => {
-        values.delete(key);
-      }),
-    };
-
-    vi.stubGlobal('window', {
-      addEventListener: vi.fn(),
-      removeEventListener: vi.fn(),
-      localStorage,
-    });
-
-    values.set('wpp.session-context', JSON.stringify({ sessionCode: 'ABCD12', playerId: 9, token: 'tok-1' }));
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = 'ABCD12';
-    component.playerId = 9;
-    component.sessionToken = 'tok-1';
-    component.error = 'Session refresh failed';
-    component.submitError = { kind: 'guess', message: 'Guess submit failed' };
-    component.session = {
-      session: { code: 'ABCD12', status: 'guess', current_round: 1 },
-      round_question: { id: 11, prompt: 'Q?', answers: [{ text: 'A' }] },
-      players: [],
-    };
-
-    component.returnToJoin();
-
-    expect(component.playerId).toBe(0);
-    expect(component.sessionToken).toBe('');
-    expect(component.session).toBeNull();
-    expect(component.error).toBe('');
-    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();
-  });
 });
--- a/frontend/angular/src/app/features/player/player-shell.component.ts
+++ b/frontend/angular/src/app/features/player/player-shell.component.ts
@@ -1,26 +1,10 @@
 import { CommonModule } from '@angular/common';
-import { Component, OnDestroy, OnInit } from '@angular/core';
+import { Component } 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';
-
 interface SessionDetail {
  session: { code: string; status: string; current_round: number };
  round_question: { id: number; prompt: string; answers: Array<{ text: string }> } | null;
-  players: Array<{ id: number; nickname: string; score: number }>;
-}
-
-type ConnectionState = 'online' | 'reconnecting' | 'offline';
-type LoadingTransition = 'refresh' | 'join' | 'submit-lie' | 'submit-guess' | null;
-
-function resolveLocalStorage(): Storage | undefined {
-  if (typeof window === 'undefined') {
-    return undefined;
-  }
-  return window.localStorage;
 }

@Component({
@@ -28,35 +12,22 @@ 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>
-    </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>
-    </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
@@ -70,30 +41,15 @@ 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>
-
-      <div *ngIf="session.session.status === 'finished' && finalLeaderboard.length">
-        <h3>{{ copy('player.final_leaderboard') }}</h3>
-        <ol>
-          <li *ngFor="let entry of finalLeaderboard">{{ entry.nickname }}: {{ entry.score }}</li>
-        </ol>
-      </div>
+      <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>

    <p *ngIf="error" class="error">{{ error }}</p>
    <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>
-    </div>
  `,
 })
-export class PlayerShellComponent implements OnInit, OnDestroy {
-  locale = resolvePreferredLocale();
-  readonly clientHasNoAudioOutput = clientHasNoAudioOutput;
-
+export class PlayerShellComponent {
  sessionCode = '';
  nickname = '';
  playerId = 0;
@@ -104,232 +60,11 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
  error = '';
  submitError: { kind: 'lie' | 'guess'; message: string } | null = null;
  session: SessionDetail | null = null;
-  finalLeaderboard: Array<{ id: number; nickname: string; score: number }> = [];
-  connectionState: ConnectionState = 'online';
-  loadingTransition: LoadingTransition = null;
-
-  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;
-
-  constructor() {
-    if (typeof navigator !== 'undefined' && !navigator.onLine) {
-      this.connectionState = 'offline';
-    }
-
-    if (typeof window !== 'undefined') {
-      window.addEventListener('online', this.handleOnline);
-      window.addEventListener('offline', this.handleOffline);
-    }
-  }
-
-  ngOnInit(): void {
-    this.unsubscribeLocale = subscribeToLocaleChanges((locale) => {
-      this.locale = locale;
-    });
-
-    const hashRoute = window.location.hash.replace(/^#\/?/, '');
-    const match = hashRoute.match(/^player(?:\/[^/]+)?(?:\/([^/?#]+))?/i);
-    const codeFromRoute = match?.[1] ?? '';
-
-    const persistedContext = this.sessionContextStore.get();
-    if (persistedContext) {
-      this.playerId = persistedContext.playerId;
-      this.sessionToken = persistedContext.token;
-    }
-
-    const candidate = codeFromRoute || persistedContext?.sessionCode || '';
-    if (!candidate) {
-      return;
-    }
-
-    this.sessionCode = this.normalizeCode(candidate);
-    void this.refreshSession();
-  }
-
-  ngOnDestroy(): void {
-    if (typeof window !== 'undefined') {
-      window.removeEventListener('online', this.handleOnline);
-      window.removeEventListener('offline', this.handleOffline);
-    }
-    this.clearReconnectTimer();
-    this.clearStateSyncTimer();
-    this.unsubscribeLocale?.();
-    this.unsubscribeLocale = null;
-  }
-
-  private readonly handleOnline = (): void => {
-    this.connectionState = 'reconnecting';
-    void this.retryReconnect();
-  };
-
-  private readonly handleOffline = (): void => {
-    this.connectionState = 'offline';
-    this.clearReconnectTimer();
-    this.clearStateSyncTimer();
-  };
-
-  private clearReconnectTimer(): void {
-    if (this.reconnectTimer) {
-      clearTimeout(this.reconnectTimer);
-      this.reconnectTimer = null;
-    }
-  }
-
-  private clearStateSyncTimer(): void {
-    if (this.stateSyncTimer) {
-      clearTimeout(this.stateSyncTimer);
-      this.stateSyncTimer = null;
-    }
-  }
-
-  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');
-      case 'submit-lie':
-        return this.copy('player.loading_submit_lie');
-      case 'submit-guess':
-        return this.copy('player.loading_submit_guess');
-      case 'refresh':
-      default:
-        return this.copy('player.loading_refresh');
-    }
-  }
-
-  copy(key: string): string {
-    return t(key, this.locale);
-  }

  private normalizeCode(value: string): string {
    return value.trim().toUpperCase();
  }

-  private toMessage(error: unknown): string {
-    if (error instanceof Error && error.message) {
-      return error.message;
-    }
-    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;
-    }
-
-    const message = this.toMessage(error).toLowerCase();
-    if (
-      message.includes('fetch') ||
-      message.includes('network') ||
-      message.includes('failed to') ||
-      message.includes('could not load lobby status') ||
-      message.includes('session refresh failed')
-    ) {
-      this.connectionState = 'reconnecting';
-      this.scheduleReconnect();
-    }
-  }
-
-  private scheduleReconnect(): void {
-    if (this.reconnectTimer || !this.sessionCode.trim()) {
-      return;
-    }
-
-    this.reconnectTimer = setTimeout(() => {
-      this.reconnectTimer = null;
-      void this.retryReconnect();
-    }, 2000);
-  }
-
-  async retryReconnect(): Promise<void> {
-    if (!this.sessionCode.trim() || this.loading) {
-      return;
-    }
-
-    await this.refreshSession();
-  }
-
-  returnToJoin(): void {
-    this.loadingTransition = null;
-    this.clearReconnectTimer();
-    this.clearStateSyncTimer();
-    this.connectionState = typeof navigator !== 'undefined' && !navigator.onLine ? 'offline' : 'online';
-    this.session = null;
-    this.finalLeaderboard = [];
-    this.selectedGuess = '';
-    this.lieText = '';
-    this.submitError = null;
-    this.error = '';
-    this.playerId = 0;
-    this.sessionToken = '';
-    this.sessionContextStore.clear();
-  }
-
-  private syncFinalLeaderboard(): void {
-    if (!this.session || this.session.session.status !== 'finished') {
-      this.finalLeaderboard = [];
-      return;
-    }
-
-    this.finalLeaderboard = [...this.session.players].sort((a, b) => {
-      if (b.score !== a.score) {
-        return b.score - a.score;
-      }
-      return a.nickname.localeCompare(b.nickname);
-    });
-  }
-
-  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,
@@ -351,57 +86,40 @@ export class PlayerShellComponent implements OnInit, OnDestroy {

  async refreshSession(): Promise<void> {
    this.loading = true;
-    this.loadingTransition = 'refresh';
    this.error = '';
    try {
-      const state = await this.controller.hydrateLobby(this.sessionCode);
-      if (!state.session || state.errorMessage) {
-        throw new Error(state.errorMessage ?? 'Unknown error');
-      }
-      this.session = state.session as SessionDetail;
+      const code = this.normalizeCode(this.sessionCode);
+      this.session = await this.request<SessionDetail>(`/lobby/sessions/${encodeURIComponent(code)}`, 'GET');
      this.sessionCode = this.session.session.code;
      if (this.session.session.status !== 'guess') {
        this.selectedGuess = '';
      }
-      this.syncFinalLeaderboard();
-      this.syncRouteFromSession();
-      this.markOnline();
    } catch (error) {
-      this.error = `${this.copy('player.session_refresh_failed')}: ${this.toMessage(error)}`;
-      this.markConnectionIssue(error);
+      this.error = `Session refresh failed: ${(error as Error).message}`;
    } finally {
      this.loading = false;
-      this.loadingTransition = null;
    }
  }

  async joinSession(): Promise<void> {
    this.loading = true;
-    this.loadingTransition = 'join';
    this.error = '';
    try {
-      const state = await this.controller.joinLobby(this.sessionCode, this.nickname);
-      if (!state.session || state.errorMessage) {
-        throw new Error(state.errorMessage ?? 'Unknown error');
-      }
-      this.session = state.session as SessionDetail;
-      this.sessionCode = this.session.session.code;
-
-      const sessionContext = this.sessionContextStore.get();
-      this.playerId = sessionContext?.playerId ?? 0;
-      this.sessionToken = sessionContext?.token ?? '';
-      if (this.session.session.status !== 'guess') {
-        this.selectedGuess = '';
-      }
-      this.syncFinalLeaderboard();
-      this.syncRouteFromSession();
-      this.markOnline();
+      const payload = await this.request<{
+        player: { id: number; session_token: string };
+        session: { code: string };
+      }>('/lobby/sessions/join', 'POST', {
+        code: this.normalizeCode(this.sessionCode),
+        nickname: this.nickname.trim(),
+      });
+      this.playerId = payload.player.id;
+      this.sessionToken = payload.player.session_token;
+      this.sessionCode = payload.session.code;
+      await this.refreshSession();
    } catch (error) {
-      this.error = `${this.copy('player.join_failed')}: ${this.toMessage(error)}`;
-      this.markConnectionIssue(error);
+      this.error = `Join failed: ${(error as Error).message}`;
    } finally {
      this.loading = false;
-      this.loadingTransition = null;
    }
  }

@@ -410,7 +128,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
      return;
    }
    this.loading = true;
-    this.loadingTransition = 'submit-lie';
    this.submitError = null;
    try {
      await this.request(
@@ -423,13 +140,10 @@ 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.markConnectionIssue(error);
+      this.submitError = { kind: 'lie', message: `Lie submit failed: ${(error as Error).message}` };
    } finally {
      this.loading = false;
-      this.loadingTransition = null;
    }
  }

@@ -438,7 +152,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
      return;
    }
    this.loading = true;
-    this.loadingTransition = 'submit-guess';
    this.submitError = null;
    try {
      await this.request(
@@ -451,13 +164,10 @@ 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.markConnectionIssue(error);
+      this.submitError = { kind: 'guess', message: `Guess submit failed: ${(error as Error).message}` };
    } finally {
      this.loading = false;
-      this.loadingTransition = null;
    }
  }
 }
--- a/frontend/angular/src/app/lobby-i18n.spec.ts
+++ b/frontend/angular/src/app/lobby-i18n.spec.ts
@@ -1,47 +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']);
-  });
-});
--- a/frontend/angular/src/app/lobby-i18n.ts
+++ b/frontend/angular/src/app/lobby-i18n.ts
@@ -1,86 +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 queryLocale = new URLSearchParams(window.location?.search ?? '').get('lang');
-  const storedLocale = window.localStorage?.getItem?.('wpp.locale');
-  const browserLocale = typeof navigator !== 'undefined' ? navigator.language : '';
-
-  activeLocale = normalizeLocale(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);
-  };
-}
-
-export function t(key: string, locale: string): string {
-  const normalizedLocale = normalizeLocale(locale);
-  const fallbackLocale = DEFAULT_LOCALE;
-  const segments = 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);
--- a/frontend/angular/src/app/session-route-context.spec.ts
+++ b/frontend/angular/src/app/session-route-context.spec.ts
@@ -1,86 +0,0 @@
-import { afterEach, describe, expect, it, vi } from 'vitest';
-
-import { hostRouteContextResolver, playerRouteContextResolver, resolveSessionCode } from './session-route-context';
-
-type RouteLike = {
-  paramMap: { get: (key: string) => string | null };
-  queryParamMap: { get: (key: string) => string | null };
-};
-
-function route(params: Record<string, string | null>, query: Record<string, string | null> = {}): RouteLike {
-  return {
-    paramMap: { get: (key: string) => params[key] ?? null },
-    queryParamMap: { get: (key: string) => query[key] ?? null },
-  };
-}
-
-function storageMock(initial: Record<string, string> = {}): Storage {
-  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);
-    }),
-    removeItem: vi.fn((key: string) => {
-      data.delete(key);
-    }),
-    clear: vi.fn(() => {
-      data.clear();
-    }),
-    key: vi.fn((index: number) => Array.from(data.keys())[index] ?? null),
-    get length() {
-      return data.size;
-    },
-  } as unknown as Storage;
-}
-
-function setWindow(localStorage: Storage, sessionStorage: Storage): void {
-  vi.stubGlobal('window', { localStorage, sessionStorage });
-}
-
-describe('session route context', () => {
-  afterEach(() => {
-    vi.restoreAllMocks();
-  });
-
-  it('resolves player code from persisted session context when route has no code', () => {
-    setWindow(
-      storageMock({ 'wpp.session-context': JSON.stringify({ sessionCode: 'ab12', playerId: 7, token: 'tok' }) }),
-      storageMock()
-    );
-
-    expect(resolveSessionCode(route({}, {}) as never, 'player')).toBe('AB12');
-  });
-
-  it('resolves host code from session query string', () => {
-    setWindow(storageMock(), storageMock());
-
-    expect(resolveSessionCode(route({}, { session: 'qwe9' }) as never, 'host')).toBe('QWE9');
-  });
-
-  it('player resolver emits player id/token when context matches route session', () => {
-    setWindow(
-      storageMock({ 'wpp.session-context': JSON.stringify({ sessionCode: 'AB12', playerId: 5, token: 'tok-5' }) }),
-      storageMock()
-    );
-
-    expect(playerRouteContextResolver(route({ context: 'ab12' }) as never, {} as never)).toEqual({
-      sessionCode: 'AB12',
-      playerId: 5,
-      token: 'tok-5',
-    });
-  });
-
-  it('host resolver stores normalized host session code for refresh bootstrap', () => {
-    const sessionStorage = storageMock();
-    setWindow(storageMock(), sessionStorage);
-
-    expect(hostRouteContextResolver(route({ context: 'ab12' }) as never, {} as never)).toEqual({
-      sessionCode: 'AB12',
-      playerId: null,
-      token: null,
-    });
-    expect(sessionStorage.setItem).toHaveBeenCalledWith('wpp.host-session-code', 'AB12');
-  });
-});
--- a/frontend/angular/src/app/session-route-context.ts
+++ b/frontend/angular/src/app/session-route-context.ts
@@ -1,140 +0,0 @@
-import { inject } from '@angular/core';
-import { type ActivatedRouteSnapshot, type CanActivateFn, type ResolveFn, Router, type UrlTree } from '@angular/router';
-
-import { createSessionContextStore } from '../../../src/spa/session-context-store';
-
-export interface RouteSessionContext {
-  sessionCode: string | null;
-  playerId: number | null;
-  token: string | null;
-}
-
-const HOST_STORAGE_KEY = 'wpp.host-session-code';
-
-function normalizeCode(value: string): string {
-  return value.trim().toUpperCase();
-}
-
-function isCodeLike(value: string | null | undefined): value is string {
-  return !!value && /^[A-Za-z0-9]{4,12}$/.test(value.trim());
-}
-
-function hasPlayerSessionContext(sessionCode: string): boolean {
-  const context = createSessionContextStore(window.localStorage).get();
-  if (!context) {
-    return false;
-  }
-
-  return (
-    isCodeLike(context.sessionCode) &&
-    normalizeCode(context.sessionCode) === normalizeCode(sessionCode) &&
-    Number.isInteger(context.playerId) &&
-    context.playerId > 0 &&
-    !!context.token.trim()
-  );
-}
-
-export function resolveSessionCode(route: ActivatedRouteSnapshot, mode: 'host' | 'player'): string | null {
-  const contextParam = route.paramMap.get('context');
-  const queryCode = route.queryParamMap.get('session');
-
-  if (isCodeLike(contextParam)) {
-    return normalizeCode(contextParam);
-  }
-  if (isCodeLike(queryCode)) {
-    return normalizeCode(queryCode);
-  }
-
-  if (mode === 'player') {
-    const persisted = createSessionContextStore(window.localStorage).get()?.sessionCode;
-    if (isCodeLike(persisted)) {
-      return normalizeCode(persisted);
-    }
-    return null;
-  }
-
-  const stored = window.sessionStorage.getItem(HOST_STORAGE_KEY);
-  if (isCodeLike(stored)) {
-    return normalizeCode(stored);
-  }
-
-  return null;
-}
-
-async function sessionExists(code: string): Promise<boolean> {
-  const response = await fetch(`/lobby/sessions/${encodeURIComponent(code)}`, {
-    method: 'GET',
-    headers: { Accept: 'application/json' },
-    credentials: 'same-origin',
-  });
-
-  return response.ok;
-}
-
-async function requireSessionContext(route: ActivatedRouteSnapshot, mode: 'host' | 'player'): Promise<boolean> {
-  const phase = route.paramMap.get('phase');
-  const code = resolveSessionCode(route, mode);
-
-  if (!phase) {
-    if (mode === 'host' && code) {
-      window.sessionStorage.setItem(HOST_STORAGE_KEY, code);
-    }
-    return true;
-  }
-
-  if (!code) {
-    return false;
-  }
-
-  if (mode === 'player' && !hasPlayerSessionContext(code)) {
-    return false;
-  }
-
-  const ok = await sessionExists(code);
-  if (!ok) {
-    return false;
-  }
-
-  if (mode === 'host') {
-    window.sessionStorage.setItem(HOST_STORAGE_KEY, code);
-  }
-
-  return true;
-}
-
-async function guard(mode: 'host' | 'player', route: ActivatedRouteSnapshot): Promise<boolean | UrlTree> {
-  const router = inject(Router);
-  const allowed = await requireSessionContext(route, mode);
-  if (allowed) {
-    return true;
-  }
-
-  return router.createUrlTree([`/${mode}`]);
-}
-
-export const hostRouteGuard: CanActivateFn = (route) => guard('host', route);
-
-export const playerRouteGuard: CanActivateFn = (route) => guard('player', route);
-
-export const hostRouteContextResolver: ResolveFn<RouteSessionContext> = (route) => {
-  const code = resolveSessionCode(route, 'host');
-  if (code) {
-    window.sessionStorage.setItem(HOST_STORAGE_KEY, code);
-  }
-  return { sessionCode: code, playerId: null, token: null };
-};
-
-export const playerRouteContextResolver: ResolveFn<RouteSessionContext> = (route) => {
-  const code = resolveSessionCode(route, 'player');
-  const context = createSessionContextStore(window.localStorage).get();
-
-  if (!code || !context || normalizeCode(context.sessionCode) !== code) {
-    return { sessionCode: code, playerId: null, token: null };
-  }
-
-  return {
-    sessionCode: code,
-    playerId: Number.isInteger(context.playerId) && context.playerId > 0 ? context.playerId : null,
-    token: context.token.trim() || null,
-  };
-};
--- a/frontend/src/api/angular-client.ts
+++ b/frontend/src/api/angular-client.ts
@@ -1,36 +1,12 @@
-import {
-  mapCalculateScoresResponse,
-  mapFinishGameResponse,
-  mapHealthResponse,
-  mapJoinSessionResponse,
-  mapMixAnswersResponse,
-  mapScoreboardResponse,
-  mapSessionDetailResponse,
-  mapShowQuestionResponse,
-  mapStartNextRoundResponse,
-  mapStartRoundResponse,
-  mapSubmitGuessResponse,
-  mapSubmitLieResponse
-} from './mappers';
 import type {
  ApiFailure,
  ApiResult,
-  CalculateScoresResponse,
-  FinishGameResponse,
  HealthResponse,
  JoinSessionRequest,
  JoinSessionResponse,
-  MixAnswersResponse,
-  ScoreboardResponse,
  SessionDetailResponse,
-  ShowQuestionResponse,
-  StartNextRoundResponse,
  StartRoundRequest,
-  StartRoundResponse,
-  SubmitGuessRequest,
-  SubmitGuessResponse,
-  SubmitLieRequest,
-  SubmitLieResponse
+  StartRoundResponse
 } from './types';

 export interface AngularHttpError {
@@ -49,18 +25,6 @@ export interface AngularApiClient {
  getSession(code: string): Promise<ApiResult<SessionDetailResponse>>;
  joinSession(payload: JoinSessionRequest): Promise<ApiResult<JoinSessionResponse>>;
  startRound(code: string, payload: StartRoundRequest): Promise<ApiResult<StartRoundResponse>>;
-  showQuestion(code: string): Promise<ApiResult<ShowQuestionResponse>>;
-  mixAnswers(code: string, roundQuestionId: number): Promise<ApiResult<MixAnswersResponse>>;
-  calculateScores(code: string, roundQuestionId: number): Promise<ApiResult<CalculateScoresResponse>>;
-  getScoreboard(code: string): Promise<ApiResult<ScoreboardResponse>>;
-  startNextRound(code: string): Promise<ApiResult<StartNextRoundResponse>>;
-  finishGame(code: string): Promise<ApiResult<FinishGameResponse>>;
-  submitLie(code: string, roundQuestionId: number, payload: SubmitLieRequest): Promise<ApiResult<SubmitLieResponse>>;
-  submitGuess(
-    code: string,
-    roundQuestionId: number,
-    payload: SubmitGuessRequest
-  ): Promise<ApiResult<SubmitGuessResponse>>;
 }

 function toFailure(error: unknown): ApiFailure {
@@ -96,10 +60,10 @@ function buildUrl(baseUrl: string, path: string): string {
  return `${normalizeBaseUrl(baseUrl)}${path}`;
 }

-async function wrap<T>(call: () => Promise<unknown>, mapper: (payload: unknown) => T): Promise<ApiResult<T>> {
-  let payload: unknown;
+async function wrap<T>(call: () => Promise<T>): Promise<ApiResult<T>> {
  try {
-    payload = await call();
+    const data = await call();
+    return { ok: true, status: 200, data };
  } catch (error: unknown) {
    return {
      ok: false,
@@ -107,156 +71,35 @@ async function wrap<T>(call: () => Promise<unknown>, mapper: (payload: unknown)
      error: toFailure(error)
    };
  }
-
-  try {
-    return { ok: true, status: 200, data: mapper(payload) };
-  } catch (error: unknown) {
-    return {
-      ok: false,
-      status: 200,
-      error: {
-        kind: 'parse',
-        status: 200,
-        message: error instanceof Error ? error.message : 'Invalid API response contract',
-        payload
-      }
-    };
-  }
 }

 export function createAngularApiClient(http: AngularHttpClientLike, baseUrl = ''): AngularApiClient {
  return {
-    health: () =>
-      wrap(() => http.get<HealthResponse>(buildUrl(baseUrl, '/healthz'), { withCredentials: true }), mapHealthResponse),
+    health: () => wrap(() => http.get<HealthResponse>(buildUrl(baseUrl, '/healthz'), { withCredentials: true })),
    getSession: (code: string) =>
-      wrap(
-        () =>
-          http.get<SessionDetailResponse>(buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}`), {
-            withCredentials: true
-          }),
-        mapSessionDetailResponse
+      wrap(() =>
+        http.get<SessionDetailResponse>(buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}`), {
+          withCredentials: true
+        })
      ),
    joinSession: (payload: JoinSessionRequest) =>
-      wrap(
-        () =>
-          http.post<JoinSessionResponse>(
-            buildUrl(baseUrl, '/lobby/sessions/join'),
-            {
-              code: normalizeCode(payload.code),
-              nickname: payload.nickname.trim()
-            },
-            { withCredentials: true }
-          ),
-        mapJoinSessionResponse
+      wrap(() =>
+        http.post<JoinSessionResponse>(
+          buildUrl(baseUrl, '/lobby/sessions/join'),
+          {
+            code: normalizeCode(payload.code),
+            nickname: payload.nickname.trim()
+          },
+          { withCredentials: true }
+        )
      ),
    startRound: (code: string, payload: StartRoundRequest) =>
-      wrap(
-        () =>
-          http.post<StartRoundResponse>(
-            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/rounds/start`),
-            payload,
-            { withCredentials: true }
-          ),
-        mapStartRoundResponse
-      ),
-    showQuestion: (code: string) =>
-      wrap(
-        () =>
-          http.post<ShowQuestionResponse>(
-            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/show`),
-            {},
-            { withCredentials: true }
-          ),
-        mapShowQuestionResponse
-      ),
-    mixAnswers: (code: string, roundQuestionId: number) =>
-      wrap(
-        () =>
-          http.post<MixAnswersResponse>(
-            buildUrl(
-              baseUrl,
-              `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/answers/mix`
-            ),
-            {},
-            { withCredentials: true }
-          ),
-        mapMixAnswersResponse
-      ),
-    calculateScores: (code: string, roundQuestionId: number) =>
-      wrap(
-        () =>
-          http.post<CalculateScoresResponse>(
-            buildUrl(
-              baseUrl,
-              `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/scores/calculate`
-            ),
-            {},
-            { withCredentials: true }
-          ),
-        mapCalculateScoresResponse
-      ),
-    getScoreboard: (code: string) =>
-      wrap(
-        () =>
-          http.get<ScoreboardResponse>(
-            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/scoreboard`),
-            { withCredentials: true }
-          ),
-        mapScoreboardResponse
-      ),
-    startNextRound: (code: string) =>
-      wrap(
-        () =>
-          http.post<StartNextRoundResponse>(
-            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/rounds/next`),
-            {},
-            { withCredentials: true }
-          ),
-        mapStartNextRoundResponse
-      ),
-    finishGame: (code: string) =>
-      wrap(
-        () =>
-          http.post<FinishGameResponse>(
-            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/finish`),
-            {},
-            { withCredentials: true }
-          ),
-        mapFinishGameResponse
-      ),
-    submitLie: (code: string, roundQuestionId: number, payload: SubmitLieRequest) =>
-      wrap(
-        () =>
-          http.post<SubmitLieResponse>(
-            buildUrl(
-              baseUrl,
-              `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/lies/submit`
-            ),
-            {
-              player_id: payload.player_id,
-              session_token: payload.session_token,
-              text: payload.text
-            },
-            { withCredentials: true }
-          ),
-        mapSubmitLieResponse
-      ),
-    submitGuess: (code: string, roundQuestionId: number, payload: SubmitGuessRequest) =>
-      wrap(
-        () =>
-          http.post<SubmitGuessResponse>(
-            buildUrl(
-              baseUrl,
-              `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/guesses/submit`
-            ),
-            {
-              player_id: payload.player_id,
-              session_token: payload.session_token,
-              selected_text: payload.selected_text
-            },
-            { withCredentials: true }
-          ),
-        mapSubmitGuessResponse
+      wrap(() =>
+        http.post<StartRoundResponse>(
+          buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/rounds/start`),
+          payload,
+          { withCredentials: true }
+        )
      )
  };
 }
--- a/frontend/src/api/client.ts
+++ b/frontend/src/api/client.ts
@@ -1,35 +1,11 @@
-import {
-  mapCalculateScoresResponse,
-  mapFinishGameResponse,
-  mapHealthResponse,
-  mapJoinSessionResponse,
-  mapMixAnswersResponse,
-  mapNextRoundResponse,
-  mapScoreboardResponse,
-  mapSessionDetailResponse,
-  mapShowQuestionResponse,
-  mapStartRoundResponse,
-  mapSubmitGuessResponse,
-  mapSubmitLieResponse
-} from './mappers';
 import type {
  ApiResult,
-  CalculateScoresResponse,
-  FinishGameResponse,
  HealthResponse,
  JoinSessionRequest,
  JoinSessionResponse,
-  MixAnswersResponse,
-  NextRoundResponse,
-  ScoreboardResponse,
  SessionDetailResponse,
-  ShowQuestionResponse,
  StartRoundRequest,
-  StartRoundResponse,
-  SubmitGuessRequest,
-  SubmitGuessResponse,
-  SubmitLieRequest,
-  SubmitLieResponse
+  StartRoundResponse
 } from './types';

 export interface ApiClient {
@@ -37,23 +13,10 @@ export interface ApiClient {
  getSession(code: string): Promise<ApiResult<SessionDetailResponse>>;
  joinSession(payload: JoinSessionRequest): Promise<ApiResult<JoinSessionResponse>>;
  startRound(code: string, payload: StartRoundRequest): Promise<ApiResult<StartRoundResponse>>;
-  showQuestion(code: string): Promise<ApiResult<ShowQuestionResponse>>;
-  mixAnswers(code: string, roundQuestionId: number): Promise<ApiResult<MixAnswersResponse>>;
-  calculateScores(code: string, roundQuestionId: number): Promise<ApiResult<CalculateScoresResponse>>;
-  getScoreboard(code: string): Promise<ApiResult<ScoreboardResponse>>;
-  startNextRound(code: string): Promise<ApiResult<NextRoundResponse>>;
-  finishGame(code: string): Promise<ApiResult<FinishGameResponse>>;
-  submitLie(code: string, roundQuestionId: number, payload: SubmitLieRequest): Promise<ApiResult<SubmitLieResponse>>;
-  submitGuess(code: string, roundQuestionId: number, payload: SubmitGuessRequest): Promise<ApiResult<SubmitGuessResponse>>;
 }

 export function createApiClient(baseUrl = '', fetchImpl: typeof fetch = fetch): ApiClient {
-  async function request<T>(
-    path: string,
-    method: 'GET' | 'POST',
-    mapper: (payload: unknown) => T,
-    payload?: unknown
-  ): Promise<ApiResult<T>> {
+  async function request<T>(path: string, method: 'GET' | 'POST', payload?: unknown): Promise<ApiResult<T>> {
    let response: Response;
    try {
      response = await fetchImpl(`${baseUrl}${path}`, {
@@ -96,102 +59,22 @@ export function createApiClient(baseUrl = '', fetchImpl: typeof fetch = fetch):
      };
    }

-    try {
-      return { ok: true, status: response.status, data: mapper(responsePayload) };
-    } catch (error) {
-      return {
-        ok: false,
-        status: response.status,
-        error: {
-          kind: 'parse',
-          status: response.status,
-          message: error instanceof Error ? error.message : 'Invalid API response contract',
-          payload: responsePayload
-        }
-      };
-    }
+    return { ok: true, status: response.status, data: responsePayload as T };
  }

-  const normalizeCode = (value: string): string => value.trim().toUpperCase();
-
  return {
-    health: () => request<HealthResponse>('/healthz', 'GET', mapHealthResponse),
+    health: () => request<HealthResponse>('/healthz', 'GET'),
    getSession: (code: string) =>
-      request<SessionDetailResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}`,
-        'GET',
-        mapSessionDetailResponse
-      ),
+      request<SessionDetailResponse>(`/lobby/sessions/${encodeURIComponent(code.trim().toUpperCase())}`, 'GET'),
    joinSession: (payload: JoinSessionRequest) =>
-      request<JoinSessionResponse>(
-        '/lobby/sessions/join',
-        'POST',
-        mapJoinSessionResponse,
-        {
-          code: normalizeCode(payload.code),
-          nickname: payload.nickname.trim()
-        }
-      ),
+      request<JoinSessionResponse>('/lobby/sessions/join', 'POST', {
+        code: payload.code.trim().toUpperCase(),
+        nickname: payload.nickname.trim()
+      }),
    startRound: (code: string, payload: StartRoundRequest) =>
      request<StartRoundResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/rounds/start`,
+        `/lobby/sessions/${encodeURIComponent(code.trim().toUpperCase())}/rounds/start`,
        'POST',
-        mapStartRoundResponse,
-        payload
-      ),
-    showQuestion: (code: string) =>
-      request<ShowQuestionResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/show`,
-        'POST',
-        mapShowQuestionResponse,
-        {}
-      ),
-    mixAnswers: (code: string, roundQuestionId: number) =>
-      request<MixAnswersResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/answers/mix`,
-        'POST',
-        mapMixAnswersResponse,
-        {}
-      ),
-    calculateScores: (code: string, roundQuestionId: number) =>
-      request<CalculateScoresResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/scores/calculate`,
-        'POST',
-        mapCalculateScoresResponse,
-        {}
-      ),
-    getScoreboard: (code: string) =>
-      request<ScoreboardResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/scoreboard`,
-        'GET',
-        mapScoreboardResponse
-      ),
-    startNextRound: (code: string) =>
-      request<NextRoundResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/rounds/next`,
-        'POST',
-        mapNextRoundResponse,
-        {}
-      ),
-    finishGame: (code: string) =>
-      request<FinishGameResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/finish`,
-        'POST',
-        mapFinishGameResponse,
-        {}
-      ),
-    submitLie: (code: string, roundQuestionId: number, payload: SubmitLieRequest) =>
-      request<SubmitLieResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/lies/submit`,
-        'POST',
-        mapSubmitLieResponse,
-        payload
-      ),
-    submitGuess: (code: string, roundQuestionId: number, payload: SubmitGuessRequest) =>
-      request<SubmitGuessResponse>(
-        `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/guesses/submit`,
-        'POST',
-        mapSubmitGuessResponse,
        payload
      )
  };
--- a/frontend/src/api/mappers.ts
+++ b/frontend/src/api/mappers.ts
@@ -1,359 +0,0 @@
-import type {
-  CalculateScoresResponse,
-  FinishGameResponse,
-  HealthResponse,
-  JoinSessionResponse,
-  MixAnswersResponse,
-  ScoreboardResponse,
-  SessionDetailResponse,
-  ShowQuestionResponse,
-  StartNextRoundResponse,
-  StartRoundResponse,
-  SubmitGuessResponse,
-  SubmitLieResponse
-} from './types';
-
-function isRecord(value: unknown): value is Record<string, unknown> {
-  return typeof value === 'object' && value !== null;
-}
-
-function isBoolean(value: unknown): value is boolean {
-  return typeof value === 'boolean';
-}
-
-function isNumber(value: unknown): value is number {
-  return typeof value === 'number' && Number.isFinite(value);
-}
-
-function isString(value: unknown): value is string {
-  return typeof value === 'string';
-}
-
-function asRecord(value: unknown, path: string): Record<string, unknown> {
-  if (!isRecord(value)) {
-    throw new Error(`Invalid API contract: expected object at ${path}`);
-  }
-  return value;
-}
-
-function readString(record: Record<string, unknown>, key: string, path: string): string {
-  const value = record[key];
-  if (!isString(value)) {
-    throw new Error(`Invalid API contract: expected string at ${path}.${key}`);
-  }
-  return value;
-}
-
-function readNumber(record: Record<string, unknown>, key: string, path: string): number {
-  const value = record[key];
-  if (!isNumber(value)) {
-    throw new Error(`Invalid API contract: expected number at ${path}.${key}`);
-  }
-  return value;
-}
-
-function readBoolean(record: Record<string, unknown>, key: string, path: string): boolean {
-  const value = record[key];
-  if (!isBoolean(value)) {
-    throw new Error(`Invalid API contract: expected boolean at ${path}.${key}`);
-  }
-  return value;
-}
-
-export function mapHealthResponse(payload: unknown): HealthResponse {
-  const root = asRecord(payload, 'health');
-  return {
-    ok: readBoolean(root, 'ok', 'health'),
-    service: readString(root, 'service', 'health')
-  };
-}
-
-function mapSessionDetail(payload: unknown): SessionDetailResponse {
-  const root = asRecord(payload, 'session_detail');
-  const session = asRecord(root.session, 'session_detail.session');
-  const players = root.players;
-  if (!Array.isArray(players)) {
-    throw new Error('Invalid API contract: expected array at session_detail.players');
-  }
-
-  const roundQuestionRaw = root.round_question;
-  let roundQuestion: SessionDetailResponse['round_question'] = null;
-  if (roundQuestionRaw !== null) {
-    const roundQuestionRecord = asRecord(roundQuestionRaw, 'session_detail.round_question');
-    const answersRaw = roundQuestionRecord.answers;
-    if (!Array.isArray(answersRaw)) {
-      throw new Error('Invalid API contract: expected array at session_detail.round_question.answers');
-    }
-
-    roundQuestion = {
-      id: readNumber(roundQuestionRecord, 'id', 'session_detail.round_question'),
-      round_number: readNumber(roundQuestionRecord, 'round_number', 'session_detail.round_question'),
-      prompt: readString(roundQuestionRecord, 'prompt', 'session_detail.round_question'),
-      shown_at: readString(roundQuestionRecord, 'shown_at', 'session_detail.round_question'),
-      answers: answersRaw.map((answer, index) => {
-        const answerRecord = asRecord(answer, `session_detail.round_question.answers[${index}]`);
-        return { text: readString(answerRecord, 'text', `session_detail.round_question.answers[${index}]`) };
-      })
-    };
-  }
-
-  const phase = asRecord(root.phase_view_model, 'session_detail.phase_view_model');
-  const constraints = asRecord(phase.constraints, 'session_detail.phase_view_model.constraints');
-  const host = asRecord(phase.host, 'session_detail.phase_view_model.host');
-  const player = asRecord(phase.player, 'session_detail.phase_view_model.player');
-
-  return {
-    session: {
-      code: readString(session, 'code', 'session_detail.session'),
-      status: readString(session, 'status', 'session_detail.session'),
-      host_id: (() => {
-        const hostId = session.host_id;
-        if (hostId === null) {
-          return null;
-        }
-        if (!isNumber(hostId)) {
-          throw new Error('Invalid API contract: expected number|null at session_detail.session.host_id');
-        }
-        return hostId;
-      })(),
-      current_round: readNumber(session, 'current_round', 'session_detail.session'),
-      players_count: readNumber(session, 'players_count', 'session_detail.session')
-    },
-    players: players.map((item, index) => {
-      const record = asRecord(item, `session_detail.players[${index}]`);
-      return {
-        id: readNumber(record, 'id', `session_detail.players[${index}]`),
-        nickname: readString(record, 'nickname', `session_detail.players[${index}]`),
-        score: readNumber(record, 'score', `session_detail.players[${index}]`),
-        is_connected: readBoolean(record, 'is_connected', `session_detail.players[${index}]`)
-      };
-    }),
-    round_question: roundQuestion,
-    phase_view_model: {
-      status: readString(phase, 'status', 'session_detail.phase_view_model'),
-      round_number: readNumber(phase, 'round_number', 'session_detail.phase_view_model'),
-      players_count: readNumber(phase, 'players_count', 'session_detail.phase_view_model'),
-      constraints: {
-        min_players_to_start: readNumber(constraints, 'min_players_to_start', 'session_detail.phase_view_model.constraints'),
-        max_players_mvp: readNumber(constraints, 'max_players_mvp', 'session_detail.phase_view_model.constraints'),
-        min_players_reached: readBoolean(constraints, 'min_players_reached', 'session_detail.phase_view_model.constraints'),
-        max_players_allowed: readBoolean(constraints, 'max_players_allowed', 'session_detail.phase_view_model.constraints')
-      },
-      host: {
-        can_start_round: readBoolean(host, 'can_start_round', 'session_detail.phase_view_model.host'),
-        can_show_question: readBoolean(host, 'can_show_question', 'session_detail.phase_view_model.host'),
-        can_mix_answers: readBoolean(host, 'can_mix_answers', 'session_detail.phase_view_model.host'),
-        can_calculate_scores: readBoolean(host, 'can_calculate_scores', 'session_detail.phase_view_model.host'),
-        can_reveal_scoreboard: readBoolean(host, 'can_reveal_scoreboard', 'session_detail.phase_view_model.host'),
-        can_start_next_round: readBoolean(host, 'can_start_next_round', 'session_detail.phase_view_model.host'),
-        can_finish_game: readBoolean(host, 'can_finish_game', 'session_detail.phase_view_model.host')
-      },
-      player: {
-        can_join: readBoolean(player, 'can_join', 'session_detail.phase_view_model.player'),
-        can_submit_lie: readBoolean(player, 'can_submit_lie', 'session_detail.phase_view_model.player'),
-        can_submit_guess: readBoolean(player, 'can_submit_guess', 'session_detail.phase_view_model.player'),
-        can_view_final_result: readBoolean(player, 'can_view_final_result', 'session_detail.phase_view_model.player')
-      }
-    }
-  };
-}
-
-export function mapSessionDetailResponse(payload: unknown): SessionDetailResponse {
-  return mapSessionDetail(payload);
-}
-
-export function mapJoinSessionResponse(payload: unknown): JoinSessionResponse {
-  const root = asRecord(payload, 'join_session');
-  const player = asRecord(root.player, 'join_session.player');
-  const session = asRecord(root.session, 'join_session.session');
-
-  return {
-    player: {
-      id: readNumber(player, 'id', 'join_session.player'),
-      nickname: readString(player, 'nickname', 'join_session.player'),
-      session_token: readString(player, 'session_token', 'join_session.player'),
-      score: readNumber(player, 'score', 'join_session.player')
-    },
-    session: {
-      code: readString(session, 'code', 'join_session.session'),
-      status: readString(session, 'status', 'join_session.session')
-    }
-  };
-}
-
-export function mapStartRoundResponse(payload: unknown): StartRoundResponse {
-  const root = asRecord(payload, 'start_round');
-  const session = asRecord(root.session, 'start_round.session');
-  const round = asRecord(root.round, 'start_round.round');
-  const category = asRecord(round.category, 'start_round.round.category');
-
-  return {
-    session: {
-      code: readString(session, 'code', 'start_round.session'),
-      status: readString(session, 'status', 'start_round.session'),
-      current_round: readNumber(session, 'current_round', 'start_round.session')
-    },
-    round: {
-      number: readNumber(round, 'number', 'start_round.round'),
-      category: {
-        slug: readString(category, 'slug', 'start_round.round.category'),
-        name: readString(category, 'name', 'start_round.round.category')
-      }
-    }
-  };
-}
-
-function mapLeaderboardEntry(payload: unknown, path: string): { id: number; nickname: string; score: number } {
-  const record = asRecord(payload, path);
-  return {
-    id: readNumber(record, 'id', path),
-    nickname: readString(record, 'nickname', path),
-    score: readNumber(record, 'score', path)
-  };
-}
-
-function mapSessionState(payload: unknown, path: string): { code: string; status: string; current_round: number } {
-  const session = asRecord(payload, path);
-  return {
-    code: readString(session, 'code', path),
-    status: readString(session, 'status', path),
-    current_round: readNumber(session, 'current_round', path)
-  };
-}
-
-export function mapShowQuestionResponse(payload: unknown): ShowQuestionResponse {
-  const root = asRecord(payload, 'show_question');
-  const roundQuestion = asRecord(root.round_question, 'show_question.round_question');
-  const config = asRecord(root.config, 'show_question.config');
-
-  return {
-    round_question: {
-      id: readNumber(roundQuestion, 'id', 'show_question.round_question'),
-      prompt: readString(roundQuestion, 'prompt', 'show_question.round_question'),
-      round_number: readNumber(roundQuestion, 'round_number', 'show_question.round_question'),
-      shown_at: readString(roundQuestion, 'shown_at', 'show_question.round_question'),
-      lie_deadline_at: readString(roundQuestion, 'lie_deadline_at', 'show_question.round_question')
-    },
-    config: {
-      lie_seconds: readNumber(config, 'lie_seconds', 'show_question.config')
-    }
-  };
-}
-
-export function mapMixAnswersResponse(payload: unknown): MixAnswersResponse {
-  const root = asRecord(payload, 'mix_answers');
-  const roundQuestion = asRecord(root.round_question, 'mix_answers.round_question');
-  const answersRaw = root.answers;
-  if (!Array.isArray(answersRaw)) {
-    throw new Error('Invalid API contract: expected array at mix_answers.answers');
-  }
-
-  return {
-    session: mapSessionState(root.session, 'mix_answers.session'),
-    round_question: {
-      id: readNumber(roundQuestion, 'id', 'mix_answers.round_question'),
-      round_number: readNumber(roundQuestion, 'round_number', 'mix_answers.round_question')
-    },
-    answers: answersRaw.map((answer, index) => {
-      const record = asRecord(answer, `mix_answers.answers[${index}]`);
-      return { text: readString(record, 'text', `mix_answers.answers[${index}]`) };
-    })
-  };
-}
-
-export function mapCalculateScoresResponse(payload: unknown): CalculateScoresResponse {
-  const root = asRecord(payload, 'calculate_scores');
-  const roundQuestion = asRecord(root.round_question, 'calculate_scores.round_question');
-  const leaderboardRaw = root.leaderboard;
-  if (!Array.isArray(leaderboardRaw)) {
-    throw new Error('Invalid API contract: expected array at calculate_scores.leaderboard');
-  }
-
-  return {
-    session: mapSessionState(root.session, 'calculate_scores.session'),
-    round_question: {
-      id: readNumber(roundQuestion, 'id', 'calculate_scores.round_question'),
-      round_number: readNumber(roundQuestion, 'round_number', 'calculate_scores.round_question')
-    },
-    events_created: readNumber(root, 'events_created', 'calculate_scores'),
-    leaderboard: leaderboardRaw.map((entry, index) => mapLeaderboardEntry(entry, `calculate_scores.leaderboard[${index}]`))
-  };
-}
-
-export function mapScoreboardResponse(payload: unknown): ScoreboardResponse {
-  const root = asRecord(payload, 'scoreboard');
-  const leaderboardRaw = root.leaderboard;
-  if (!Array.isArray(leaderboardRaw)) {
-    throw new Error('Invalid API contract: expected array at scoreboard.leaderboard');
-  }
-
-  return {
-    session: mapSessionState(root.session, 'scoreboard.session'),
-    leaderboard: leaderboardRaw.map((entry, index) => mapLeaderboardEntry(entry, `scoreboard.leaderboard[${index}]`))
-  };
-}
-
-export function mapStartNextRoundResponse(payload: unknown): StartNextRoundResponse {
-  const root = asRecord(payload, 'start_next_round');
-  return { session: mapSessionState(root.session, 'start_next_round.session') };
-}
-
-export function mapFinishGameResponse(payload: unknown): FinishGameResponse {
-  const root = asRecord(payload, 'finish_game');
-  const leaderboardRaw = root.leaderboard;
-  if (!Array.isArray(leaderboardRaw)) {
-    throw new Error('Invalid API contract: expected array at finish_game.leaderboard');
-  }
-
-  const winnerRaw = root.winner;
-
-  return {
-    session: mapSessionState(root.session, 'finish_game.session'),
-    winner: winnerRaw === null ? null : mapLeaderboardEntry(winnerRaw, 'finish_game.winner'),
-    leaderboard: leaderboardRaw.map((entry, index) => mapLeaderboardEntry(entry, `finish_game.leaderboard[${index}]`))
-  };
-}
-
-export function mapSubmitLieResponse(payload: unknown): SubmitLieResponse {
-  const root = asRecord(payload, 'submit_lie');
-  const lie = asRecord(root.lie, 'submit_lie.lie');
-  const window = asRecord(root.window, 'submit_lie.window');
-
-  return {
-    lie: {
-      id: readNumber(lie, 'id', 'submit_lie.lie'),
-      player_id: readNumber(lie, 'player_id', 'submit_lie.lie'),
-      round_question_id: readNumber(lie, 'round_question_id', 'submit_lie.lie'),
-      text: readString(lie, 'text', 'submit_lie.lie'),
-      created_at: readString(lie, 'created_at', 'submit_lie.lie')
-    },
-    window: {
-      lie_deadline_at: readString(window, 'lie_deadline_at', 'submit_lie.window')
-    }
-  };
-}
-
-export function mapSubmitGuessResponse(payload: unknown): SubmitGuessResponse {
-  const root = asRecord(payload, 'submit_guess');
-  const guess = asRecord(root.guess, 'submit_guess.guess');
-  const window = asRecord(root.window, 'submit_guess.window');
-  const fooledPlayerId = guess.fooled_player_id;
-  if (fooledPlayerId !== null && !isNumber(fooledPlayerId)) {
-    throw new Error('Invalid API contract: expected number|null at submit_guess.guess.fooled_player_id');
-  }
-
-  return {
-    guess: {
-      id: readNumber(guess, 'id', 'submit_guess.guess'),
-      player_id: readNumber(guess, 'player_id', 'submit_guess.guess'),
-      round_question_id: readNumber(guess, 'round_question_id', 'submit_guess.guess'),
-      selected_text: readString(guess, 'selected_text', 'submit_guess.guess'),
-      is_correct: readBoolean(guess, 'is_correct', 'submit_guess.guess'),
-      fooled_player_id: fooledPlayerId,
-      created_at: readString(guess, 'created_at', 'submit_guess.guess')
-    },
-    window: {
-      guess_deadline_at: readString(window, 'guess_deadline_at', 'submit_guess.window')
-    }
-  };
-}
--- a/frontend/src/api/types.ts
+++ b/frontend/src/api/types.ts
@@ -101,113 +101,6 @@ export interface StartRoundResponse {
  };
 }

-export interface ShowQuestionResponse {
-  round_question: {
-    id: number;
-    prompt: string;
-    round_number: number;
-    shown_at: string;
-    lie_deadline_at: string;
-  };
-  config: {
-    lie_seconds: number;
-  };
-}
-
-export interface MixAnswersResponse {
-  session: {
-    code: string;
-    status: string;
-    current_round: number;
-  };
-  round_question: {
-    id: number;
-    round_number: number;
-  };
-  answers: Array<{ text: string }>;
-}
-
-export interface CalculateScoresResponse {
-  session: {
-    code: string;
-    status: string;
-    current_round: number;
-  };
-  round_question: {
-    id: number;
-    round_number: number;
-  };
-  events_created: number;
-  leaderboard: Array<{ id: number; nickname: string; score: number }>;
-}
-
-export interface ScoreboardResponse {
-  session: {
-    code: string;
-    status: string;
-    current_round: number;
-  };
-  leaderboard: Array<{ id: number; nickname: string; score: number }>;
-}
-
-export interface StartNextRoundResponse {
-  session: {
-    code: string;
-    status: string;
-    current_round: number;
-  };
-}
-
-export interface FinishGameResponse {
-  session: {
-    code: string;
-    status: string;
-    current_round: number;
-  };
-  winner: { id: number; nickname: string; score: number } | null;
-  leaderboard: Array<{ id: number; nickname: string; score: number }>;
-}
-
-export interface SubmitLieRequest {
-  player_id: number;
-  session_token: string;
-  text: string;
-}
-
-export interface SubmitLieResponse {
-  lie: {
-    id: number;
-    player_id: number;
-    round_question_id: number;
-    text: string;
-    created_at: string;
-  };
-  window: {
-    lie_deadline_at: string;
-  };
-}
-
-export interface SubmitGuessRequest {
-  player_id: number;
-  session_token: string;
-  selected_text: string;
-}
-
-export interface SubmitGuessResponse {
-  guess: {
-    id: number;
-    player_id: number;
-    round_question_id: number;
-    selected_text: string;
-    is_correct: boolean;
-    fooled_player_id: number | null;
-    created_at: string;
-  };
-  window: {
-    guess_deadline_at: string;
-  };
-}
-
 export type ApiErrorKind = 'network' | 'http' | 'parse';

 export interface ApiFailure {
--- a/frontend/src/spa/gameplay-phase-machine.ts
+++ b/frontend/src/spa/gameplay-phase-machine.ts
@@ -1,58 +0,0 @@
-import type { SessionDetailResponse } from '../api/types';
-
-export type GameplayPhase = 'lie' | 'guess' | 'reveal' | 'scoreboard';
-
-export type GameplayPhaseEvent =
-  | 'LIES_LOCKED'
-  | 'GUESSES_LOCKED'
-  | 'SCOREBOARD_READY'
-  | 'NEXT_ROUND';
-
-export interface GameplayTransitionResult {
-  phase: GameplayPhase;
-  changed: boolean;
-}
-
-const TRANSITIONS: Record<GameplayPhase, Partial<Record<GameplayPhaseEvent, GameplayPhase>>> = {
-  lie: {
-    LIES_LOCKED: 'guess'
-  },
-  guess: {
-    GUESSES_LOCKED: 'reveal'
-  },
-  reveal: {
-    SCOREBOARD_READY: 'scoreboard'
-  },
-  scoreboard: {
-    NEXT_ROUND: 'lie'
-  }
-};
-
-export function transitionGameplayPhase(phase: GameplayPhase, event: GameplayPhaseEvent): GameplayTransitionResult {
-  const next = TRANSITIONS[phase][event] ?? phase;
-  return {
-    phase: next,
-    changed: next !== phase
-  };
-}
-
-export function allowedGameplayEvents(phase: GameplayPhase): GameplayPhaseEvent[] {
-  return Object.keys(TRANSITIONS[phase]) as GameplayPhaseEvent[];
-}
-
-export function deriveGameplayPhase(session: SessionDetailResponse | null): GameplayPhase | null {
-  const status = session?.session.status;
-  if (!status) {
-    return null;
-  }
-
-  if (status === 'lie' || status === 'guess' || status === 'reveal') {
-    return status;
-  }
-
-  if (status === 'finished') {
-    return 'scoreboard';
-  }
-
-  return null;
-}
--- a/frontend/src/spa/lobby-i18n.ts
+++ b/frontend/src/spa/lobby-i18n.ts
@@ -1,31 +0,0 @@
-import lobbyCatalog from '../../../shared/i18n/lobby.json';
-
-type FrontendErrorKey = keyof typeof lobbyCatalog.frontend.errors;
-
-const frontendErrors = lobbyCatalog.frontend.errors;
-
-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'
-};
-
-export function lobbyMessage(key: FrontendErrorKey): string {
-  return frontendErrors[key] ?? frontendErrors.unknown;
-}
-
-export function lobbyMessageFromApiPayload(payload: unknown, fallbackKey: FrontendErrorKey): string {
-  if (!payload || typeof payload !== 'object') {
-    return lobbyMessage(fallbackKey);
-  }
-
-  const record = payload as Record<string, unknown>;
-  const code = typeof record.error_code === 'string' ? record.error_code : '';
-  const mappedKey = apiErrorMap[code];
-  if (!mappedKey) {
-    return lobbyMessage(fallbackKey);
-  }
-
-  return lobbyMessage(mappedKey);
-}
--- a/frontend/src/spa/vertical-slice.ts
+++ b/frontend/src/spa/vertical-slice.ts
@@ -6,8 +6,6 @@ import {
  type SessionContextInput,
  type SessionContextStore as PersistedSessionContextStore
 } from './session-context-store';
-import { deriveGameplayPhase, type GameplayPhase } from './gameplay-phase-machine';
-import { lobbyMessage, lobbyMessageFromApiPayload } from './lobby-i18n';

 export type AsyncState = 'idle' | 'loading' | 'success' | 'error';

@@ -16,7 +14,6 @@ export type SessionContextStore = Pick<PersistedSessionContextStore, 'get' | 'se
 export interface VerticalSliceState {
  sessionCode: string;
  session: SessionDetailResponse | null;
-  gameplayPhase: GameplayPhase | null;
  joinState: AsyncState;
  startRoundState: AsyncState;
  loadingSession: boolean;
@@ -39,7 +36,6 @@ export function createVerticalSliceController(
  const state: VerticalSliceState = {
    sessionCode: persistedContext?.sessionCode ?? '',
    session: null,
-    gameplayPhase: null,
    joinState: 'idle',
    startRoundState: 'idle',
    loadingSession: false,
@@ -58,7 +54,7 @@ export function createVerticalSliceController(

    if (!state.sessionCode) {
      state.loadingSession = false;
-      state.errorMessage = lobbyMessage('session_code_required');
+      state.errorMessage = 'Session-kode mangler.';
      return { ...state };
    }

@@ -66,13 +62,11 @@ export function createVerticalSliceController(
    state.loadingSession = false;

    if (!result.ok) {
-      state.errorMessage = lobbyMessageFromApiPayload(result.error.payload, 'session_fetch_failed');
-      state.gameplayPhase = null;
+      state.errorMessage = 'Kunne ikke hente lobby-status.';
      return { ...state };
    }

    state.session = result.data;
-    state.gameplayPhase = deriveGameplayPhase(result.data);
    state.sessionCode = normalizeCode(result.data.session.code);

    if (persistedContext && state.sessionCode === normalizeCode(persistedContext.sessionCode)) {
@@ -93,7 +87,7 @@ export function createVerticalSliceController(
    const join = await api.joinSession({ code: requestCode, nickname });
    if (!join.ok) {
      state.joinState = 'error';
-      state.errorMessage = lobbyMessageFromApiPayload(join.error.payload, 'join_failed');
+      state.errorMessage = 'Join fejlede. Tjek kode eller nickname og prøv igen.';
      return { ...state };
    }

@@ -120,14 +114,14 @@ export function createVerticalSliceController(

    if (!codeToUse) {
      state.startRoundState = 'error';
-      state.errorMessage = lobbyMessage('session_code_required');
+      state.errorMessage = 'Session-kode mangler.';
      return { ...state };
    }

    const start = await api.startRound(codeToUse, { category_slug: categorySlug });
    if (!start.ok) {
      state.startRoundState = 'error';
-      state.errorMessage = lobbyMessageFromApiPayload(start.error.payload, 'start_round_failed');
+      state.errorMessage = 'Kunne ikke starte runden. Opdatér lobbyen og prøv igen.';
      return { ...state };
    }

--- a/frontend/tests/angular-api-client.test.ts
+++ b/frontend/tests/angular-api-client.test.ts
@@ -189,143 +189,6 @@ describe('createAngularApiClient', () => {
    );
  });

-  it('returns parse error when successful payload breaks typed contract', async () => {
-    const http = {
-      get: vi.fn<AngularHttpClientLike['get']>(async <T>() => ({ ok: true } as T)),
-      post: vi.fn<AngularHttpClientLike['post']>(async <T>() => ({ ok: true } as T))
-    };
-
-    const client = createAngularApiClient(http as AngularHttpClientLike);
-    const session = await client.getSession('ABCD12');
-
-    expect(session.ok).toBe(false);
-    if (!session.ok) {
-      expect(session.status).toBe(200);
-      expect(session.error.kind).toBe('parse');
-      expect(session.error.message).toContain('Invalid API contract');
-    }
-  });
-
-  it('maps host/player gameplay endpoints through typed response mappers', async () => {
-    const get = vi.fn<AngularHttpClientLike['get']>(async <T>(url: string) => {
-      if (url === '/lobby/sessions/ABCD12/scoreboard') {
-        return {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
-          leaderboard: [
-            { id: 2, nickname: 'Maja', score: 11 },
-            { id: 3, nickname: 'Bo', score: 7 }
-          ]
-        } as T;
-      }
-      throw { status: 404, error: { error: 'Not found' } };
-    });
-
-    const post = vi.fn<AngularHttpClientLike['post']>(async <T>(url: string, body: unknown) => {
-      if (url === '/lobby/sessions/ABCD12/questions/show') {
-        expect(body).toEqual({});
-        return {
-          round_question: {
-            id: 77,
-            prompt: 'Prompt?',
-            round_number: 1,
-            shown_at: '2026-03-01T16:00:00Z',
-            lie_deadline_at: '2026-03-01T16:00:30Z'
-          },
-          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: 3,
-          leaderboard: [{ id: 2, nickname: 'Maja', score: 11 }]
-        } as T;
-      }
-      if (url === '/lobby/sessions/ABCD12/rounds/next') {
-        expect(body).toEqual({});
-        return { session: { code: 'ABCD12', status: 'lobby', 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: 2, nickname: 'Maja', score: 15 },
-          leaderboard: [{ id: 2, nickname: 'Maja', score: 15 }]
-        } as T;
-      }
-      if (url === '/lobby/sessions/ABCD12/questions/77/lies/submit') {
-        expect(body).toEqual({ player_id: 9, session_token: 'tok', text: 'my lie' });
-        return {
-          lie: {
-            id: 100,
-            player_id: 9,
-            round_question_id: 77,
-            text: 'my lie',
-            created_at: '2026-03-01T16:00:10Z'
-          },
-          window: { lie_deadline_at: '2026-03-01T16:00:30Z' }
-        } as T;
-      }
-      if (url === '/lobby/sessions/ABCD12/questions/77/guesses/submit') {
-        expect(body).toEqual({ player_id: 9, session_token: 'tok', selected_text: 'A' });
-        return {
-          guess: {
-            id: 200,
-            player_id: 9,
-            round_question_id: 77,
-            selected_text: 'A',
-            is_correct: false,
-            fooled_player_id: 3,
-            created_at: '2026-03-01T16:01:00Z'
-          },
-          window: { guess_deadline_at: '2026-03-01T16:01:30Z' }
-        } as T;
-      }
-
-      throw { status: 404, error: { error: 'Not found' } };
-    });
-
-    const client = createAngularApiClient({ get, post } as AngularHttpClientLike);
-
-    const showQuestion = await client.showQuestion('abcd12');
-    expect(showQuestion.ok).toBe(true);
-
-    const mixAnswers = await client.mixAnswers('abcd12', 77);
-    expect(mixAnswers.ok).toBe(true);
-
-    const calculateScores = await client.calculateScores('abcd12', 77);
-    expect(calculateScores.ok).toBe(true);
-
-    const scoreboard = await client.getScoreboard('abcd12');
-    expect(scoreboard.ok).toBe(true);
-
-    const nextRound = await client.startNextRound('abcd12');
-    expect(nextRound.ok).toBe(true);
-
-    const finish = await client.finishGame('abcd12');
-    expect(finish.ok).toBe(true);
-
-    const submitLie = await client.submitLie('abcd12', 77, { player_id: 9, session_token: 'tok', text: 'my lie' });
-    expect(submitLie.ok).toBe(true);
-
-    const submitGuess = await client.submitGuess('abcd12', 77, {
-      player_id: 9,
-      session_token: 'tok',
-      selected_text: 'A'
-    });
-    expect(submitGuess.ok).toBe(true);
-  });
-
  it('maps HttpErrorResponse-style failures to ApiResult errors', async () => {
    const http = {
      get: vi.fn<AngularHttpClientLike['get']>(async () => {
--- a/frontend/tests/api-client.integration.test.ts
+++ b/frontend/tests/api-client.integration.test.ts
@@ -74,12 +74,6 @@ beforeAll(async () => {
      return;
    }

-    if (req.url === '/lobby/sessions/BADMAP' && req.method === 'GET') {
-      res.writeHead(200, { 'content-type': 'application/json' });
-      res.end(JSON.stringify({ session: { code: 'BADMAP' } }));
-      return;
-    }
-
    if (req.url?.startsWith('/lobby/sessions/')) {
      res.writeHead(404, { 'content-type': 'application/json' });
      res.end(JSON.stringify({ error: 'Session not found' }));
@@ -129,18 +123,6 @@ describe('createApiClient', () => {
    }
  });

-  it('returns parse error when response violates typed contract', async () => {
-    const client = createApiClient(baseUrl);
-
-    const invalid = await client.getSession('badmap');
-    expect(invalid.ok).toBe(false);
-    if (!invalid.ok) {
-      expect(invalid.status).toBe(200);
-      expect(invalid.error.kind).toBe('parse');
-      expect(invalid.error.message).toContain('Invalid API contract');
-    }
-  });
-
  it('returns consistent HTTP error shape for 4xx/5xx', async () => {
    const client = createApiClient(baseUrl);

--- a/frontend/tests/gameplay-phase-machine.test.ts
+++ b/frontend/tests/gameplay-phase-machine.test.ts
@@ -1,106 +0,0 @@
-import { describe, expect, it } from 'vitest';
-import {
-  allowedGameplayEvents,
-  deriveGameplayPhase,
-  transitionGameplayPhase,
-  type GameplayPhase
-} from '../src/spa/gameplay-phase-machine';
-
-describe('gameplay phase machine skeleton', () => {
-  it('supports canonical phase progression lie -> guess -> reveal -> scoreboard -> lie', () => {
-    let phase: GameplayPhase = 'lie';
-
-    phase = transitionGameplayPhase(phase, 'LIES_LOCKED').phase;
-    expect(phase).toBe('guess');
-
-    phase = transitionGameplayPhase(phase, 'GUESSES_LOCKED').phase;
-    expect(phase).toBe('reveal');
-
-    phase = transitionGameplayPhase(phase, 'SCOREBOARD_READY').phase;
-    expect(phase).toBe('scoreboard');
-
-    phase = transitionGameplayPhase(phase, 'NEXT_ROUND').phase;
-    expect(phase).toBe('lie');
-  });
-
-  it('keeps state unchanged for invalid transition events', () => {
-    const transition = transitionGameplayPhase('lie', 'NEXT_ROUND');
-    expect(transition.phase).toBe('lie');
-    expect(transition.changed).toBe(false);
-  });
-
-  it('exposes allowed events per phase', () => {
-    expect(allowedGameplayEvents('guess')).toEqual(['GUESSES_LOCKED']);
-    expect(allowedGameplayEvents('scoreboard')).toEqual(['NEXT_ROUND']);
-  });
-
-  it('derives gameplay phase from session detail status', () => {
-    expect(
-      deriveGameplayPhase({
-        session: { code: 'ABCD12', status: 'lie', host_id: 1, current_round: 1, players_count: 3 },
-        players: [],
-        round_question: null,
-        phase_view_model: {
-          status: 'lie',
-          round_number: 1,
-          players_count: 3,
-          constraints: {
-            min_players_to_start: 3,
-            max_players_mvp: 5,
-            min_players_reached: true,
-            max_players_allowed: true
-          },
-          host: {
-            can_start_round: false,
-            can_show_question: true,
-            can_mix_answers: true,
-            can_calculate_scores: false,
-            can_reveal_scoreboard: false,
-            can_start_next_round: false,
-            can_finish_game: false
-          },
-          player: {
-            can_join: false,
-            can_submit_lie: true,
-            can_submit_guess: false,
-            can_view_final_result: false
-          }
-        }
-      })
-    ).toBe('lie');
-
-    expect(
-      deriveGameplayPhase({
-        session: { code: 'ABCD12', status: 'finished', host_id: 1, current_round: 1, players_count: 3 },
-        players: [],
-        round_question: null,
-        phase_view_model: {
-          status: 'finished',
-          round_number: 1,
-          players_count: 3,
-          constraints: {
-            min_players_to_start: 3,
-            max_players_mvp: 5,
-            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
-          }
-        }
-      })
-    ).toBe('scoreboard');
-  });
-});
--- a/frontend/tests/vertical-slice.test.ts
+++ b/frontend/tests/vertical-slice.test.ts
@@ -105,7 +105,6 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
    vi.doUnmock('../src/spa/session-context-store');
    vi.resetModules();
  });
-
  it('tracks loading and success state for join + start flow', async () => {
    const api = makeApiMock();
    const controller = createVerticalSliceController(api);
@@ -161,7 +160,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
      joinSession: vi.fn().mockResolvedValue({
        ok: false,
        status: 404,
-        error: { kind: 'http', status: 404, message: 'HTTP 404', payload: { error: 'Session not found', error_code: 'session_not_found' } }
+        error: { kind: 'http', status: 404, message: 'HTTP 404', payload: { error: 'Session not found' } }
      })
    });

@@ -170,7 +169,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {

    const state = controller.getState();
    expect(state.joinState).toBe('error');
-    expect(state.errorMessage).toBe('Session code is invalid or the session no longer exists.');
+    expect(state.errorMessage).toContain('Join fejlede');
  });

  it('surfaces a friendly error when round start fails', async () => {
@@ -178,7 +177,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
      startRound: vi.fn().mockResolvedValue({
        ok: false,
        status: 400,
-        error: { kind: 'http', status: 400, message: 'HTTP 400', payload: { error: 'Round can only be started from lobby', error_code: 'round_start_invalid_phase' } }
+        error: { kind: 'http', status: 400, message: 'HTTP 400', payload: { error: 'Round can only be started from lobby' } }
      })
    });

@@ -187,7 +186,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {

    const state = controller.getState();
    expect(state.startRoundState).toBe('error');
-    expect(state.errorMessage).toBe('Could not start round. Refresh the lobby and try again.');
+    expect(state.errorMessage).toContain('Kunne ikke starte runden');
  });

  it('shows local validation error and avoids API call when hydrating without any session code', async () => {
@@ -197,7 +196,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
    await controller.hydrateLobby('   ');

    const state = controller.getState();
-    expect(state.errorMessage).toBe('Session code is required.');
+    expect(state.errorMessage).toBe('Session-kode mangler.');
    expect(state.loadingSession).toBe(false);
    expect(api.getSession).not.toHaveBeenCalled();
  });
@@ -210,7 +209,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {

    const state = controller.getState();
    expect(state.startRoundState).toBe('error');
-    expect(state.errorMessage).toBe('Session code is required.');
+    expect(state.errorMessage).toBe('Session-kode mangler.');
    expect(api.startRound).not.toHaveBeenCalled();
  });

--- a/frontend/tsconfig.json
+++ b/frontend/tsconfig.json
@@ -3,11 +3,10 @@
    "target": "ES2022",
    "module": "ES2022",
    "moduleResolution": "bundler",
-    "resolveJsonModule": true,
    "strict": true,
    "skipLibCheck": true,
    "lib": ["ES2022", "DOM"],
    "types": ["vitest/globals", "node"]
  },
-  "include": ["src", "tests", "../shared/i18n/*.json"]
+  "include": ["src", "tests"]
 }
--- a/lobby/i18n.py
+++ b/lobby/i18n.py
@@ -1,70 +0,0 @@
-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__)
-
-
-@lru_cache(maxsize=1)
-def lobby_i18n_catalog() -> dict:
-    catalog_path = Path(__file__).resolve().parents[1] / "shared" / "i18n" / "lobby.json"
-    with catalog_path.open(encoding="utf-8") as handle:
-        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()
-    requested = (get_language_from_request(request) or "").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,
-    )
--- a/lobby/tests.py
+++ b/lobby/tests.py
@@ -19,7 +19,6 @@ from fupogfakta.models import (
    RoundConfig,
    RoundQuestion,
 )
-from lobby.i18n import resolve_error_message

 User = get_user_model()

@@ -111,32 +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)
@@ -1201,8 +1174,3 @@ class SmokeStagingCommandTests(TestCase):
                    "finish_game",
                ],
            )
-
-
-class I18nResolverTests(TestCase):
-    def test_missing_backend_key_returns_key_deterministically(self):
-        self.assertEqual(resolve_error_message(key="missing_key", locale="da"), "missing_key")
--- a/lobby/ui_views.py
+++ b/lobby/ui_views.py
@@ -5,7 +5,6 @@ from django.shortcuts import render
 from fupogfakta.models import Category

 from .feature_flags import use_spa_ui
-from .i18n import lobby_i18n_catalog


 def _render_spa_shell(request, shell_route: str, shell_kind: str):
@@ -16,7 +15,6 @@ 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,
-            "lobby_i18n": lobby_i18n_catalog(),
        },
    )

@@ -32,18 +30,11 @@ def host_screen(request, spa_path=None):
        return _render_spa_shell(request, host_route, "host")

    categories = Category.objects.filter(is_active=True).order_by("name")
-    return render(
-        request,
-        "lobby/host_screen.html",
-        {
-            "categories": categories,
-            "lobby_i18n": lobby_i18n_catalog(),
-        },
-    )
+    return render(request, "lobby/host_screen.html", {"categories": categories})


 def player_screen(request):
    if use_spa_ui():
        return _render_spa_shell(request, "/player", "player")

-    return render(request, "lobby/player_screen.html", {"lobby_i18n": lobby_i18n_catalog()})
+    return render(request, "lobby/player_screen.html")
--- a/lobby/views.py
+++ b/lobby/views.py
@@ -20,8 +20,6 @@ from fupogfakta.models import (
    ScoreEvent,
 )

-from .i18n import api_error, lobby_i18n_errors
-
 SESSION_CODE_ALPHABET = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"
 SESSION_CODE_LENGTH = 6
 MAX_CODE_GENERATION_ATTEMPTS = 20
@@ -31,7 +29,6 @@ JOINABLE_STATUSES = {
    GameSession.Status.GUESS,
    GameSession.Status.REVEAL,
 }
-ERROR_CODES = lobby_i18n_errors()


 def _json_body(request: HttpRequest) -> dict:
@@ -127,41 +124,21 @@ def join_session(request: HttpRequest) -> JsonResponse:
    nickname = str(payload.get("nickname", "")).strip()

    if not code:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("session_code_required", "session_code_required"),
-            status=400,
-        )
+        return JsonResponse({"error": "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"),
-            status=400,
-        )
+        return JsonResponse({"error": "Nickname must be between 2 and 40 characters"}, status=400)

    try:
        session = GameSession.objects.get(code=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.status not in JOINABLE_STATUSES:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_joinable", "session_not_joinable"),
-            status=400,
-        )
+        return JsonResponse({"error": "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"),
-            status=409,
-        )
+        return JsonResponse({"error": "Nickname already taken"}, status=409)

    player = Player.objects.create(session=session, nickname=nickname)

@@ -189,11 +166,7 @@ def session_detail(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)

    players = list(
        session.players.order_by("nickname").values(
@@ -250,41 +223,25 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
    category_slug = str(payload.get("category_slug", "")).strip()

    if not category_slug:
-        return api_error(
-            request,
-            key=ERROR_CODES.get("category_slug_required", "category_slug_required"),
-            status=400,
-        )
+        return JsonResponse({"error": "category_slug is required"}, status=400)

    session_code = _normalize_session_code(code)

    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 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"),
-            status=400,
-        )
+        return JsonResponse({"error": "Round can only be started from lobby"}, status=400)

    try:
        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"),
-            status=404,
-        )
+        return JsonResponse({"error": "Category not found"}, status=404)

    if not Question.objects.filter(category=category, is_active=True).exists():
        return JsonResponse({"error": "Category has no active questions"}, status=400)
@@ -292,11 +249,7 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
    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"),
-                status=400,
-            )
+            return JsonResponse({"error": "Round can only be started from lobby"}, status=400)

        round_config, created = RoundConfig.objects.get_or_create(
            session=session,
@@ -304,11 +257,7 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
            defaults={"category": category},
        )
        if not created:
-            return api_error(
-                request,
-                key=ERROR_CODES.get("round_already_configured", "round_already_configured"),
-                status=409,
-            )
+            return JsonResponse({"error": "Round already configured"}, status=409)

        session.status = GameSession.Status.LIE
        session.save(update_fields=["status"])
--- a/partyhub/settings.py
+++ b/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
--- a/shared/i18n/lobby.json
+++ b/shared/i18n/lobby.json
@@ -1,317 +0,0 @@
-{
-  "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"
-        }
-      },
-      "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
-    }
-  },
-  "backend": {
-    "error_codes": {
-      "session_code_required": "session_code_required",
-      "nickname_invalid": "nickname_invalid",
-      "session_not_found": "session_not_found",
-      "session_not_joinable": "session_not_joinable",
-      "nickname_taken": "nickname_taken",
-      "category_slug_required": "category_slug_required",
-      "category_not_found": "category_not_found",
-      "round_start_invalid_phase": "round_start_invalid_phase",
-      "round_already_configured": "round_already_configured"
-    },
-    "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"
-      }
-    }
-  }
-}