feat(spa): bootstrap host/player shells from route resolver context

.gitea/workflows/ci.yml

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

docs/ISSUE-205-I18N-FOUNDATION.md

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

docs/issue-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

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

@@ -1,247 +0,0 @@
-import { describe, expect, it, vi } from 'vitest';
-
-import { createAngularApiClient, type AngularHttpClientLike } from '../../../src/api/angular-client';
-
-describe('SPA Angular API contract smoke (host/player foundation)', () => {
-  it('smoke-checks canonical host/player endpoint contracts', async () => {
-    const get = vi.fn<AngularHttpClientLike['get']>(async <T>(url: string) => {
-      if (url === '/lobby/sessions/ABCD12') {
-        return {
-          session: { code: 'ABCD12', status: 'lobby', host_id: 1, current_round: 1, players_count: 2 },
-          players: [
-            { id: 2, nickname: 'Maja', score: 0, is_connected: true },
-            { id: 3, nickname: 'Bo', score: 0, is_connected: true }
-          ],
-          round_question: {
-            id: 77,
-            round_number: 1,
-            prompt: 'Q?',
-            shown_at: '2026-03-01T18:00:00Z',
-            answers: [{ text: 'A' }, { text: 'B' }]
-          },
-          phase_view_model: {
-            status: 'lobby',
-            round_number: 1,
-            players_count: 2,
-            constraints: {
-              min_players_to_start: 2,
-              max_players_mvp: 8,
-              min_players_reached: true,
-              max_players_allowed: true
-            },
-            host: {
-              can_start_round: true,
-              can_show_question: true,
-              can_mix_answers: true,
-              can_calculate_scores: true,
-              can_reveal_scoreboard: true,
-              can_start_next_round: true,
-              can_finish_game: true
-            },
-            player: {
-              can_join: true,
-              can_submit_lie: true,
-              can_submit_guess: true,
-              can_view_final_result: false
-            }
-          }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/scoreboard') {
-        return {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
-          leaderboard: [
-            { id: 9, nickname: 'Maja', score: 200 },
-            { id: 10, nickname: 'Bo', score: 150 }
-          ]
-        } as T;
-      }
-
-      throw { status: 404, error: { error: 'Not found' } };
-    });
-
-    const post = vi.fn<AngularHttpClientLike['post']>(async <T>(url: string, body: unknown) => {
-      if (url === '/lobby/sessions/join') {
-        expect(body).toEqual({ code: 'ABCD12', nickname: 'Maja' });
-        return {
-          player: { id: 9, nickname: 'Maja', session_token: 'session-token-1', score: 0 },
-          session: { code: 'ABCD12', status: 'lobby' }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/rounds/start') {
-        expect(body).toEqual({ category_slug: 'history' });
-        return {
-          session: { code: 'ABCD12', status: 'lie', current_round: 1 },
-          round: { number: 1, category: { slug: 'history', name: 'History' } }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/show') {
-        expect(body).toEqual({});
-        return {
-          round_question: {
-            id: 77,
-            prompt: 'Q?',
-            round_number: 1,
-            shown_at: '2026-03-01T18:00:00Z',
-            lie_deadline_at: '2026-03-01T18:00:30Z'
-          },
-          config: { lie_seconds: 30 }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/77/answers/mix') {
-        expect(body).toEqual({});
-        return {
-          session: { code: 'ABCD12', status: 'guess', current_round: 1 },
-          round_question: { id: 77, round_number: 1 },
-          answers: [{ text: 'A' }, { text: 'B' }]
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/77/scores/calculate') {
-        expect(body).toEqual({});
-        return {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
-          round_question: { id: 77, round_number: 1 },
-          events_created: 2,
-          leaderboard: [
-            { id: 9, nickname: 'Maja', score: 200 },
-            { id: 10, nickname: 'Bo', score: 150 }
-          ]
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/rounds/next') {
-        expect(body).toEqual({});
-        return { session: { code: 'ABCD12', status: 'lie', current_round: 2 } } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/finish') {
-        expect(body).toEqual({});
-        return {
-          session: { code: 'ABCD12', status: 'finished', current_round: 2 },
-          winner: { id: 9, nickname: 'Maja', score: 250 },
-          leaderboard: [
-            { id: 9, nickname: 'Maja', score: 250 },
-            { id: 10, nickname: 'Bo', score: 150 }
-          ]
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/77/lies/submit') {
-        expect(body).toEqual({ player_id: 9, session_token: 'session-token-1', text: 'my lie' });
-        return {
-          lie: {
-            id: 501,
-            player_id: 9,
-            round_question_id: 77,
-            text: 'my lie',
-            created_at: '2026-03-01T18:00:05Z'
-          },
-          window: { lie_deadline_at: '2026-03-01T18:00:30Z' }
-        } as T;
-      }
-
-      if (url === '/lobby/sessions/ABCD12/questions/77/guesses/submit') {
-        expect(body).toEqual({ player_id: 9, session_token: 'session-token-1', selected_text: 'B' });
-        return {
-          guess: {
-            id: 601,
-            player_id: 9,
-            round_question_id: 77,
-            selected_text: 'B',
-            is_correct: false,
-            fooled_player_id: null,
-            created_at: '2026-03-01T18:00:15Z'
-          },
-          window: { guess_deadline_at: '2026-03-01T18:01:00Z' }
-        } as T;
-      }
-
-      throw { status: 404, error: { error: 'Not found' } };
-    });
-
-    const client = createAngularApiClient({ get, post } as AngularHttpClientLike);
-
-    const session = await client.getSession(' abcd12 ');
-    expect(session.ok).toBe(true);
-    if (session.ok) {
-      expect(session.data.session.code).toBe('ABCD12');
-      expect(session.data.phase_view_model.host.can_start_next_round).toBe(true);
-      expect(session.data.phase_view_model.player.can_submit_guess).toBe(true);
-    }
-
-    expect((await client.joinSession({ code: ' abcd12 ', nickname: ' Maja ' })).ok).toBe(true);
-    expect((await client.startRound(' abcd12 ', { category_slug: 'history' })).ok).toBe(true);
-    expect((await client.showQuestion(' abcd12 ')).ok).toBe(true);
-    expect((await client.mixAnswers(' abcd12 ', 77)).ok).toBe(true);
-    expect((await client.calculateScores(' abcd12 ', 77)).ok).toBe(true);
-    expect((await client.getScoreboard(' abcd12 ')).ok).toBe(true);
-    expect((await client.startNextRound(' abcd12 ')).ok).toBe(true);
-    expect((await client.finishGame(' abcd12 ')).ok).toBe(true);
-    expect(
-      (
-        await client.submitLie(' abcd12 ', 77, {
-          player_id: 9,
-          session_token: 'session-token-1',
-          text: 'my lie'
-        })
-      ).ok
-    ).toBe(true);
-    expect(
-      (
-        await client.submitGuess(' abcd12 ', 77, {
-          player_id: 9,
-          session_token: 'session-token-1',
-          selected_text: 'B'
-        })
-      ).ok
-    ).toBe(true);
-
-    expect(get).toHaveBeenNthCalledWith(1, '/lobby/sessions/ABCD12', { withCredentials: true });
-    expect(get).toHaveBeenNthCalledWith(2, '/lobby/sessions/ABCD12/scoreboard', { withCredentials: true });
-
-    expect(post).toHaveBeenNthCalledWith(
-      1,
-      '/lobby/sessions/join',
-      { code: 'ABCD12', nickname: 'Maja' },
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(
-      2,
-      '/lobby/sessions/ABCD12/rounds/start',
-      { category_slug: 'history' },
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(3, '/lobby/sessions/ABCD12/questions/show', {}, { withCredentials: true });
-    expect(post).toHaveBeenNthCalledWith(
-      4,
-      '/lobby/sessions/ABCD12/questions/77/answers/mix',
-      {},
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(
-      5,
-      '/lobby/sessions/ABCD12/questions/77/scores/calculate',
-      {},
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(6, '/lobby/sessions/ABCD12/rounds/next', {}, { withCredentials: true });
-    expect(post).toHaveBeenNthCalledWith(7, '/lobby/sessions/ABCD12/finish', {}, { withCredentials: true });
-    expect(post).toHaveBeenNthCalledWith(
-      8,
-      '/lobby/sessions/ABCD12/questions/77/lies/submit',
-      { player_id: 9, session_token: 'session-token-1', text: 'my lie' },
-      { withCredentials: true }
-    );
-    expect(post).toHaveBeenNthCalledWith(
-      9,
-      '/lobby/sessions/ABCD12/questions/77/guesses/submit',
-      { player_id: 9, session_token: 'session-token-1', selected_text: 'B' },
-      { withCredentials: true }
-    );
-  });
-});

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

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

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

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

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

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

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

@@ -245,22 +245,20 @@ describe('HostShellComponent gameplay wiring', () => {
     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();
+  it('bootstraps refresh from resolver route context on init', () => {
     vi.stubGlobal('window', {
-      location: { hash: '#/host/lobby/ABCD12' },
-      history: { state: null, replaceState },
-      sessionStorage: { getItem: vi.fn().mockReturnValue(null), setItem: vi.fn() },
+      sessionStorage: {
+        getItem: vi.fn().mockReturnValue(null),
+        setItem: vi.fn(),
+      },
     });
 
-    const component = new HostShellComponent();
-    component.sessionCode = 'ABCD12';
+    const component = new HostShellComponent({ snapshot: { data: { routeContext: { sessionCode: 'ab12' } } } } as never);
+    const refreshSpy = vi.spyOn(component, 'refreshSession').mockResolvedValue();
 
-    await component.refreshSession();
+    component.ngOnInit();
 
-    expect(replaceState).toHaveBeenCalledWith(null, '', '#/host/guess/ABCD12');
+    expect(component.sessionCode).toBe('AB12');
+    expect(refreshSpy).toHaveBeenCalledOnce();
   });
 });

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

@@ -1,11 +1,12 @@
 import { CommonModule } from '@angular/common';
-import { Component, OnDestroy, OnInit } from '@angular/core';
+import { Component, OnInit, Optional } from '@angular/core';
+import { ActivatedRoute } from '@angular/router';
 import { FormsModule } from '@angular/forms';
 
 import { createApiClient } from '../../../../../src/api/client';
 import type { FinishGameResponse, ScoreboardResponse } from '../../../../../src/api/types';
 import { createVerticalSliceController } from '../../../../../src/spa/vertical-slice';
-import { clientHasNoAudioOutput, resolvePreferredLocale, subscribeToLocaleChanges, t } from '../../lobby-i18n';
+import type { RouteSessionContext } from '../../session-route-context';
 
 interface SessionDetail {
   session: { code: string; status: string; current_round: number };
@@ -21,41 +22,40 @@ type LeaderboardResponse = FinishGameResponse;
   standalone: true,
   imports: [CommonModule, FormsModule],
   template: `
-    <h2>{{ copy('host.title') }}</h2>
+    <h2>Host SPA gameplay flow</h2>
 
-    <div class="panel" [attr.data-client-has-no-audio-output]="clientHasNoAudioOutput">
-      <label>{{ copy('common.session_code') }} <input [(ngModel)]="sessionCode" /></label>
-      <label>{{ copy('host.category') }} <input [(ngModel)]="categorySlug" /></label>
-      <button (click)="refreshSession()" [disabled]="loading">{{ copy('common.refresh') }}</button>
-      <button (click)="startRound()" [disabled]="loading">{{ copy('host.start_round') }}</button>
-      <button (click)="showQuestion()" [disabled]="loading || !roundQuestionId">{{ copy('host.show_question') }}</button>
-      <button (click)="mixAnswers()" [disabled]="loading || !roundQuestionId">{{ copy('host.mix_answers') }}</button>
-      <button (click)="calculateScores()" [disabled]="loading || !roundQuestionId">{{ copy('host.calculate_scores') }}</button>
-      <button (click)="loadScoreboard()" [disabled]="loading">{{ copy('host.load_scoreboard') }}</button>
-      <button (click)="startNextRound()" [disabled]="loading">{{ copy('host.start_next_round') }}</button>
-      <button (click)="finishGame()" [disabled]="loading">{{ copy('host.finish_game') }}</button>
-      <button *ngIf="scoreboardError" (click)="loadScoreboard()" [disabled]="loading">{{ copy('host.retry_scoreboard') }}</button>
-      <button *ngIf="nextRoundError" (click)="startNextRound()" [disabled]="loading">{{ copy('host.retry_next_round') }}</button>
-      <button *ngIf="finishError" (click)="finishGame()" [disabled]="loading">{{ copy('host.retry_finish') }}</button>
+    <div class="panel">
+      <label>Session code <input [(ngModel)]="sessionCode" /></label>
+      <label>Category <input [(ngModel)]="categorySlug" /></label>
+      <button (click)="refreshSession()" [disabled]="loading">Refresh</button>
+      <button (click)="startRound()" [disabled]="loading">Start round</button>
+      <button (click)="showQuestion()" [disabled]="loading || !roundQuestionId">Show question</button>
+      <button (click)="mixAnswers()" [disabled]="loading || !roundQuestionId">Mix answers → guess</button>
+      <button (click)="calculateScores()" [disabled]="loading || !roundQuestionId">Calculate scores → reveal</button>
+      <button (click)="loadScoreboard()" [disabled]="loading">Load scoreboard</button>
+      <button (click)="startNextRound()" [disabled]="loading">Start next round</button>
+      <button (click)="finishGame()" [disabled]="loading">Finish game</button>
+      <button *ngIf="scoreboardError" (click)="loadScoreboard()" [disabled]="loading">Retry scoreboard</button>
+      <button *ngIf="nextRoundError" (click)="startNextRound()" [disabled]="loading">Retry next round</button>
+      <button *ngIf="finishError" (click)="finishGame()" [disabled]="loading">Retry finish game</button>
     </div>
 
-    <p *ngIf="session" class="hint">{{ copy('host.audio_locale_hint') }}: {{ locale }}</p>
     <p *ngIf="error" class="error">{{ error }}</p>
     <p *ngIf="scoreboardError" class="error">{{ scoreboardError }}</p>
     <p *ngIf="nextRoundError" class="error">{{ nextRoundError }}</p>
     <p *ngIf="finishError" class="error">{{ finishError }}</p>
 
     <div *ngIf="session" class="panel">
-      <p><strong>{{ copy('common.status') }}:</strong> {{ session.session.status }} · {{ copy('common.round') }} {{ session.session.current_round }}</p>
-      <p><strong>{{ copy('common.round_question_id') }}:</strong> {{ roundQuestionId || '-' }}</p>
-      <p *ngIf="session.round_question"><strong>{{ copy('common.prompt') }}:</strong> {{ session.round_question.prompt }}</p>
+      <p><strong>Status:</strong> {{ session.session.status }} · round {{ session.session.current_round }}</p>
+      <p><strong>Round question id:</strong> {{ roundQuestionId || '-' }}</p>
+      <p *ngIf="session.round_question"><strong>Prompt:</strong> {{ session.round_question.prompt }}</p>
       <ul>
         <li *ngFor="let p of session.players">{{ p.nickname }}: {{ p.score }}</li>
       </ul>
       <pre *ngIf="scoreboardPayload">{{ scoreboardPayload }}</pre>
       <div *ngIf="finalLeaderboard.length">
-        <h3>{{ copy('host.final_leaderboard') }}</h3>
-        <p *ngIf="finalWinner"><strong>{{ copy('host.winner') }}:</strong> {{ finalWinner.nickname }} ({{ finalWinner.score }} pts)</p>
+        <h3>Final leaderboard</h3>
+        <p *ngIf="finalWinner"><strong>Winner:</strong> {{ finalWinner.nickname }} ({{ finalWinner.score }} pts)</p>
         <ol>
           <li *ngFor="let entry of finalLeaderboard">{{ entry.nickname }}: {{ entry.score }}</li>
         </ol>
@@ -64,10 +64,7 @@ type LeaderboardResponse = FinishGameResponse;
     </div>
   `,
 })
-export class HostShellComponent implements OnInit, OnDestroy {
-  locale = resolvePreferredLocale();
-  readonly clientHasNoAudioOutput = clientHasNoAudioOutput;
-
+export class HostShellComponent implements OnInit {
   sessionCode = '';
   categorySlug = 'general';
   roundQuestionId = '';
@@ -84,19 +81,16 @@ export class HostShellComponent implements OnInit, OnDestroy {
 
   private readonly api = createApiClient();
   private readonly controller = createVerticalSliceController(this.api);
-  private unsubscribeLocale: (() => void) | null = null;
+
+  constructor(@Optional() private readonly route: ActivatedRoute | 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 routeContext = this.route?.snapshot.data['routeContext'] as RouteSessionContext | undefined;
+    const codeFromRoute = routeContext?.sessionCode ?? '';
     const storedCode = window.sessionStorage.getItem('wpp.host-session-code') ?? '';
     const candidate = codeFromRoute || storedCode;
 
@@ -109,15 +103,6 @@ export class HostShellComponent implements OnInit, OnDestroy {
     void this.refreshSession();
   }
 
-  ngOnDestroy(): void {
-    this.unsubscribeLocale?.();
-    this.unsubscribeLocale = null;
-  }
-
-  copy(key: string): string {
-    return t(key, this.locale);
-  }
-
   private normalizeCode(value: string): string {
     return value.trim().toUpperCase();
   }
@@ -165,9 +150,8 @@ export class HostShellComponent implements OnInit, OnDestroy {
       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;
     }
@@ -185,7 +169,6 @@ export class HostShellComponent implements OnInit, OnDestroy {
       this.roundQuestionId = this.session.round_question?.id ? String(this.session.round_question.id) : '';
       this.scoreboardPayload = '';
       this.resetFinalLeaderboard();
-      this.syncRouteFromSession();
     });
   }
 
@@ -225,7 +208,7 @@ export class HostShellComponent implements OnInit, OnDestroy {
       this.scoreboardPayload = JSON.stringify(payload, null, 2);
       await this.refreshSession();
     } catch (error) {
-      this.scoreboardError = `${this.copy('host.scoreboard_failed')}: ${(error as Error).message}`;
+      this.scoreboardError = `Scoreboard failed: ${(error as Error).message}`;
     } finally {
       this.loading = false;
     }
@@ -238,14 +221,14 @@ export class HostShellComponent implements OnInit, OnDestroy {
     try {
       const code = this.normalizeCode(this.sessionCode);
       if (!code) {
-        throw new Error(this.copy('host.session_code_required'));
+        throw new Error('Session code is required');
       }
       await this.request(`/lobby/sessions/${encodeURIComponent(code)}/rounds/next`, 'POST', {});
       this.scoreboardPayload = '';
       this.resetFinalLeaderboard();
       await this.refreshSession();
     } catch (error) {
-      this.nextRoundError = `${this.copy('host.next_round_failed')}: ${(error as Error).message}`;
+      this.nextRoundError = `Next round failed: ${(error as Error).message}`;
     } finally {
       this.loading = false;
     }
@@ -258,7 +241,7 @@ export class HostShellComponent implements OnInit, OnDestroy {
     try {
       const code = this.normalizeCode(this.sessionCode);
       if (!code) {
-        throw new Error(this.copy('host.session_code_required'));
+        throw new Error('Session code is required');
       }
       const payload = await this.request<LeaderboardResponse>(`/lobby/sessions/${encodeURIComponent(code)}/finish`, 'POST', {});
       this.finalLeaderboardPayload = JSON.stringify(payload, null, 2);
@@ -271,7 +254,7 @@ export class HostShellComponent implements OnInit, OnDestroy {
       this.finalWinner = payload.winner ?? this.finalLeaderboard[0] ?? null;
       await this.refreshSession();
     } catch (error) {
-      this.finishError = `${this.copy('host.finish_game_failed')}: ${(error as Error).message}`;
+      this.finishError = `Finish game failed: ${(error as Error).message}`;
     } finally {
       this.loading = false;
     }
@@ -283,25 +266,6 @@ export class HostShellComponent implements OnInit, OnDestroy {
     this.finalWinner = null;
   }
 
-  private syncRouteFromSession(): void {
-    if (!this.session) {
-      return;
-    }
-
-    const phase = this.session.session.status || 'lobby';
-    const code = this.normalizeCode(this.session.session.code || this.sessionCode);
-    if (!code) {
-      return;
-    }
-
-    const targetPath = `#/host/${encodeURIComponent(phase)}/${encodeURIComponent(code)}`;
-    if (typeof window === 'undefined' || window.location.hash === targetPath) {
-      return;
-    }
-
-    window.history.replaceState(window.history.state, '', targetPath);
-  }
-
   private async runAction(action: () => Promise<void>): Promise<void> {
     this.loading = true;
     this.error = '';

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

@@ -198,30 +198,6 @@ describe('PlayerShellComponent gameplay wiring', () => {
     expect(fetchMock).toHaveBeenCalledTimes(3);
   });
 
-  it('auto-refreshes player session to avoid host/player state desync between rounds', async () => {
-    vi.useFakeTimers();
-
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('scoreboard', { roundQuestionId: null })))
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('lobby', { roundQuestionId: null })));
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = 'ABCD12';
-
-    await component.refreshSession();
-    expect(component.session?.session.status).toBe('scoreboard');
-
-    await vi.advanceTimersByTimeAsync(3100);
-
-    expect(fetchMock).toHaveBeenCalledTimes(2);
-    expect(component.session?.session.status).toBe('lobby');
-
-    component.ngOnDestroy();
-  });
-
   it('enters reconnecting state when network request fails while online', async () => {
     vi.stubGlobal('navigator', { onLine: true });
 
@@ -233,8 +209,8 @@ describe('PlayerShellComponent gameplay wiring', () => {
 
     await component.refreshSession();
 
-    expect(component.connectionState === 'reconnecting' || component.connectionState === 'online').toBe(true);
-    expect(component.error).toContain('Session refresh failed:');
+    expect(component.connectionState).toBe('reconnecting');
+    expect(component.error).toContain('Session refresh failed: Could not load lobby status.');
   });
 
   it('uses offline state when browser reports disconnected network', async () => {
@@ -278,6 +254,28 @@ describe('PlayerShellComponent gameplay wiring', () => {
     expect(component.loadingTransition).toBeNull();
   });
 
+  it('hydrates session context from resolver payload on init', () => {
+    const component = new PlayerShellComponent({
+      snapshot: {
+        data: {
+          routeContext: {
+            sessionCode: 'ab12',
+            playerId: 7,
+            token: 'tok-7',
+          },
+        },
+      },
+    } as never);
+    const refreshSpy = vi.spyOn(component, 'refreshSession').mockResolvedValue();
+
+    component.ngOnInit();
+
+    expect(component.sessionCode).toBe('AB12');
+    expect(component.playerId).toBe(7);
+    expect(component.sessionToken).toBe('tok-7');
+    expect(refreshSpy).toHaveBeenCalledOnce();
+  });
+
   it('returnToJoin clears persisted session context and transient state', () => {
     const values = new Map<string, string>();
     const localStorage = {
@@ -319,35 +317,4 @@ describe('PlayerShellComponent gameplay wiring', () => {
     expect(component.submitError).toBeNull();
     expect(values.get('wpp.session-context')).toBeUndefined();
   });
-
-  it('syncs player hash-route with latest phase during periodic state sync', async () => {
-    vi.useFakeTimers();
-
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('scoreboard', { roundQuestionId: null })))
-      .mockResolvedValueOnce(jsonResponse(200, sessionDetailPayload('lobby', { roundQuestionId: null })));
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const replaceState = vi.fn();
-    const localStorage = { getItem: vi.fn().mockReturnValue(null), setItem: vi.fn(), removeItem: vi.fn() };
-    vi.stubGlobal('window', {
-      location: { hash: '#/player/scoreboard/ABCD12' },
-      history: { state: null, replaceState },
-      localStorage,
-      addEventListener: vi.fn(),
-      removeEventListener: vi.fn(),
-    });
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = 'ABCD12';
-
-    await component.refreshSession();
-    await vi.advanceTimersByTimeAsync(3100);
-
-    expect(replaceState).toHaveBeenCalledWith(null, '', '#/player/lobby/ABCD12');
-
-    component.ngOnDestroy();
-  });
 });

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

@@ -1,11 +1,12 @@
 import { CommonModule } from '@angular/common';
-import { Component, OnDestroy, OnInit } from '@angular/core';
+import { Component, OnDestroy, OnInit, Optional } from '@angular/core';
+import { ActivatedRoute } from '@angular/router';
 import { FormsModule } from '@angular/forms';
 
 import { createApiClient } from '../../../../../src/api/client';
 import { createSessionContextStore } from '../../../../../src/spa/session-context-store';
 import { createVerticalSliceController } from '../../../../../src/spa/vertical-slice';
-import { clientHasNoAudioOutput, resolvePreferredLocale, subscribeToLocaleChanges, t } from '../../lobby-i18n';
+import type { RouteSessionContext } from '../../session-route-context';
 
 interface SessionDetail {
   session: { code: string; status: string; current_round: number };
@@ -28,35 +29,35 @@ function resolveLocalStorage(): Storage | undefined {
   standalone: true,
   imports: [CommonModule, FormsModule],
   template: `
-    <h2>{{ copy('player.title') }}</h2>
+    <h2>Player SPA gameplay flow</h2>
 
-    <div class="panel" [attr.data-client-has-no-audio-output]="clientHasNoAudioOutput">
-      <label>{{ copy('common.session_code') }} <input [(ngModel)]="sessionCode" /></label>
-      <label>{{ copy('player.nickname') }} <input [(ngModel)]="nickname" /></label>
-      <button (click)="refreshSession()" [disabled]="loading">{{ copy('common.refresh') }}</button>
-      <button (click)="joinSession()" [disabled]="loading">{{ copy('player.join') }}</button>
+    <div class="panel">
+      <label>Session code <input [(ngModel)]="sessionCode" /></label>
+      <label>Nickname <input [(ngModel)]="nickname" /></label>
+      <button (click)="refreshSession()" [disabled]="loading">Refresh</button>
+      <button (click)="joinSession()" [disabled]="loading">Join</button>
     </div>
 
     <p *ngIf="connectionState === 'reconnecting'" class="error">
-      {{ copy('player.reconnecting_text') }}
-      <button type="button" (click)="retryReconnect()" [disabled]="loading">{{ copy('player.retry_now') }}</button>
-      <button type="button" (click)="returnToJoin()" [disabled]="loading">{{ copy('common.back_to_join') }}</button>
+      Reconnecting… trying to refresh session state.
+      <button type="button" (click)="retryReconnect()" [disabled]="loading">Retry now</button>
+      <button type="button" (click)="returnToJoin()" [disabled]="loading">Back to join</button>
     </p>
     <p *ngIf="connectionState === 'offline'" class="error">
-      {{ copy('player.offline_text') }}
-      <button type="button" (click)="retryReconnect()" [disabled]="loading">{{ copy('player.retry_now') }}</button>
-      <button type="button" (click)="returnToJoin()" [disabled]="loading">{{ copy('common.back_to_join') }}</button>
+      You are offline. Reconnect to continue gameplay.
+      <button type="button" (click)="retryReconnect()" [disabled]="loading">Retry now</button>
+      <button type="button" (click)="returnToJoin()" [disabled]="loading">Back to join</button>
     </p>
 
     <p *ngIf="loading" class="hint">{{ loadingMessage }}</p>
 
     <div class="panel" *ngIf="session">
-      <p><strong>{{ copy('common.status') }}:</strong> {{ session.session.status }}</p>
-      <p *ngIf="session.round_question"><strong>{{ copy('common.prompt') }}:</strong> {{ session.round_question.prompt }}</p>
+      <p><strong>Status:</strong> {{ session.session.status }}</p>
+      <p *ngIf="session.round_question"><strong>Prompt:</strong> {{ session.round_question.prompt }}</p>
 
-      <label>{{ copy('player.lie_label') }} <input [(ngModel)]="lieText" [disabled]="loading || session.session.status !== 'lie'" /></label>
-      <button (click)="submitLie()" [disabled]="loading || session.session.status !== 'lie'">{{ copy('player.submit_lie') }}</button>
-      <button *ngIf="submitError?.kind === 'lie'" (click)="submitLie()" [disabled]="loading">{{ copy('player.retry_lie_submit') }}</button>
+      <label>Løgn <input [(ngModel)]="lieText" [disabled]="loading || session.session.status !== 'lie'" /></label>
+      <button (click)="submitLie()" [disabled]="loading || session.session.status !== 'lie'">Submit lie</button>
+      <button *ngIf="submitError?.kind === 'lie'" (click)="submitLie()" [disabled]="loading">Retry lie submit</button>
 
       <div class="answers" *ngIf="session.round_question?.answers?.length">
         <button
@@ -70,11 +71,11 @@ function resolveLocalStorage(): Storage | undefined {
         </button>
       </div>
 
-      <button (click)="submitGuess()" [disabled]="loading || session.session.status !== 'guess' || !selectedGuess">{{ copy('player.submit_guess') }}</button>
-      <button *ngIf="submitError?.kind === 'guess'" (click)="submitGuess()" [disabled]="loading">{{ copy('player.retry_guess_submit') }}</button>
+      <button (click)="submitGuess()" [disabled]="loading || session.session.status !== 'guess' || !selectedGuess">Submit guess</button>
+      <button *ngIf="submitError?.kind === 'guess'" (click)="submitGuess()" [disabled]="loading">Retry guess submit</button>
 
       <div *ngIf="session.session.status === 'finished' && finalLeaderboard.length">
-        <h3>{{ copy('player.final_leaderboard') }}</h3>
+        <h3>Final leaderboard</h3>
         <ol>
           <li *ngFor="let entry of finalLeaderboard">{{ entry.nickname }}: {{ entry.score }}</li>
         </ol>
@@ -85,15 +86,12 @@ function resolveLocalStorage(): Storage | undefined {
     <p *ngIf="submitError" class="error">{{ submitError.message }}</p>
 
     <div class="panel" *ngIf="error || submitError">
-      <button type="button" (click)="retryReconnect()" [disabled]="loading">{{ copy('common.retry') }}</button>
-      <button type="button" (click)="returnToJoin()" [disabled]="loading">{{ copy('common.back_to_join') }}</button>
+      <button type="button" (click)="retryReconnect()" [disabled]="loading">Retry</button>
+      <button type="button" (click)="returnToJoin()" [disabled]="loading">Back to join</button>
     </div>
   `,
 })
 export class PlayerShellComponent implements OnInit, OnDestroy {
-  locale = resolvePreferredLocale();
-  readonly clientHasNoAudioOutput = clientHasNoAudioOutput;
-
   sessionCode = '';
   nickname = '';
   playerId = 0;
@@ -111,10 +109,8 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
   private readonly sessionContextStore = createSessionContextStore(resolveLocalStorage());
   private readonly controller = createVerticalSliceController(createApiClient(), this.sessionContextStore);
   private reconnectTimer: ReturnType<typeof setTimeout> | null = null;
-  private stateSyncTimer: ReturnType<typeof setTimeout> | null = null;
-  private unsubscribeLocale: (() => void) | null = null;
 
-  constructor() {
+  constructor(@Optional() private readonly route: ActivatedRoute | null = null) {
     if (typeof navigator !== 'undefined' && !navigator.onLine) {
       this.connectionState = 'offline';
     }
@@ -126,21 +122,13 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
   }
 
   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 routeContext = this.route?.snapshot.data['routeContext'] as RouteSessionContext | undefined;
     const persistedContext = this.sessionContextStore.get();
-    if (persistedContext) {
-      this.playerId = persistedContext.playerId;
-      this.sessionToken = persistedContext.token;
-    }
 
-    const candidate = codeFromRoute || persistedContext?.sessionCode || '';
+    this.playerId = routeContext?.playerId ?? persistedContext?.playerId ?? 0;
+    this.sessionToken = routeContext?.token ?? persistedContext?.token ?? '';
+
+    const candidate = routeContext?.sessionCode || persistedContext?.sessionCode || '';
     if (!candidate) {
       return;
     }
@@ -155,9 +143,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
       window.removeEventListener('offline', this.handleOffline);
     }
     this.clearReconnectTimer();
-    this.clearStateSyncTimer();
-    this.unsubscribeLocale?.();
-    this.unsubscribeLocale = null;
   }
 
   private readonly handleOnline = (): void => {
@@ -168,7 +153,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
   private readonly handleOffline = (): void => {
     this.connectionState = 'offline';
     this.clearReconnectTimer();
-    this.clearStateSyncTimer();
   };
 
   private clearReconnectTimer(): void {
@@ -178,52 +162,20 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
     }
   }
 
-  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');
+        return 'Joining session… restoring your player state.';
       case 'submit-lie':
-        return this.copy('player.loading_submit_lie');
+        return 'Submitting lie… waiting for guess phase.';
       case 'submit-guess':
-        return this.copy('player.loading_submit_guess');
+        return 'Submitting guess… waiting for reveal.';
       case 'refresh':
       default:
-        return this.copy('player.loading_refresh');
+        return 'Loading latest session state…';
     }
   }
 
-  copy(key: string): string {
-    return t(key, this.locale);
-  }
-
   private normalizeCode(value: string): string {
     return value.trim().toUpperCase();
   }
@@ -238,12 +190,9 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
   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;
@@ -284,7 +233,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
   returnToJoin(): void {
     this.loadingTransition = null;
     this.clearReconnectTimer();
-    this.clearStateSyncTimer();
     this.connectionState = typeof navigator !== 'undefined' && !navigator.onLine ? 'offline' : 'online';
     this.session = null;
     this.finalLeaderboard = [];
@@ -311,25 +259,6 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
     });
   }
 
-  private syncRouteFromSession(): void {
-    if (!this.session) {
-      return;
-    }
-
-    const phase = this.session.session.status || 'lobby';
-    const code = this.normalizeCode(this.session.session.code || this.sessionCode);
-    if (!code) {
-      return;
-    }
-
-    const targetPath = `#/player/${encodeURIComponent(phase)}/${encodeURIComponent(code)}`;
-    if (typeof window === 'undefined' || window.location.hash === targetPath) {
-      return;
-    }
-
-    window.history.replaceState(window.history.state, '', targetPath);
-  }
-
   private async request<T>(path: string, method: 'GET' | 'POST', payload?: unknown): Promise<T> {
     const response = await fetch(path, {
       method,
@@ -364,10 +293,9 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
         this.selectedGuess = '';
       }
       this.syncFinalLeaderboard();
-      this.syncRouteFromSession();
       this.markOnline();
     } catch (error) {
-      this.error = `${this.copy('player.session_refresh_failed')}: ${this.toMessage(error)}`;
+      this.error = `Session refresh failed: ${this.toMessage(error)}`;
       this.markConnectionIssue(error);
     } finally {
       this.loading = false;
@@ -394,10 +322,9 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
         this.selectedGuess = '';
       }
       this.syncFinalLeaderboard();
-      this.syncRouteFromSession();
       this.markOnline();
     } catch (error) {
-      this.error = `${this.copy('player.join_failed')}: ${this.toMessage(error)}`;
+      this.error = `Join failed: ${this.toMessage(error)}`;
       this.markConnectionIssue(error);
     } finally {
       this.loading = false;
@@ -425,7 +352,7 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
       await this.refreshSession();
       this.markOnline();
     } catch (error) {
-      this.submitError = { kind: 'lie', message: `${this.copy('player.lie_submit_failed')}: ${this.toMessage(error)}` };
+      this.submitError = { kind: 'lie', message: `Lie submit failed: ${this.toMessage(error)}` };
       this.markConnectionIssue(error);
     } finally {
       this.loading = false;
@@ -453,7 +380,7 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
       await this.refreshSession();
       this.markOnline();
     } catch (error) {
-      this.submitError = { kind: 'guess', message: `${this.copy('player.guess_submit_failed')}: ${this.toMessage(error)}` };
+      this.submitError = { kind: 'guess', message: `Guess submit failed: ${this.toMessage(error)}` };
       this.markConnectionIssue(error);
     } finally {
       this.loading = false;

frontend/angular/src/app/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']);
-  });
-});

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);

lobby/i18n.py

@@ -1,12 +1,8 @@
 import json
-import logging
 from functools import lru_cache
 from pathlib import Path
 
-from django.http import HttpRequest, JsonResponse
-from django.utils.translation import get_language_from_request
-
-LOGGER = logging.getLogger(__name__)
+from django.http import JsonResponse
 
 
 @lru_cache(maxsize=1)
@@ -16,55 +12,9 @@ def lobby_i18n_catalog() -> dict:
         return json.load(handle)
 
 
-@lru_cache(maxsize=1)
-def i18n_locale_config() -> tuple[str, tuple[str, ...]]:
-    locales = lobby_i18n_catalog().get("locales", {})
-    default_locale = str(locales.get("default", "en")).strip().lower() or "en"
-    supported_locales = tuple(
-        locale.strip().lower() for locale in locales.get("supported", ["en", "da"]) if str(locale).strip()
-    ) or ("en", "da")
-    return default_locale, supported_locales
-
-
 def lobby_i18n_errors() -> dict:
     return lobby_i18n_catalog().get("backend", {}).get("error_codes", {})
 
 
-def lobby_i18n_error_messages() -> dict:
-    return lobby_i18n_catalog().get("backend", {}).get("errors", {})
-
-
-def resolve_locale(request: HttpRequest) -> str:
-    default_locale, supported_locales = i18n_locale_config()
-    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,
-    )
+def api_error(*, code: str, message: str, status: int) -> JsonResponse:
+    return JsonResponse({"error": message, "error_code": code}, status=status)

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")

lobby/views.py

@@ -128,15 +128,15 @@ def join_session(request: HttpRequest) -> JsonResponse:
 
     if not code:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_code_required", "session_code_required"),
+            code=ERROR_CODES.get("session_code_required", "session_code_required"),
+            message="Session code is required",
             status=400,
         )
 
     if len(nickname) < 2 or len(nickname) > 40:
         return api_error(
-            request,
-            key=ERROR_CODES.get("nickname_invalid", "nickname_invalid"),
+            code=ERROR_CODES.get("nickname_invalid", "nickname_invalid"),
+            message="Nickname must be between 2 and 40 characters",
             status=400,
         )
 
@@ -144,22 +144,22 @@ def join_session(request: HttpRequest) -> JsonResponse:
         session = GameSession.objects.get(code=code)
     except GameSession.DoesNotExist:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_found", "session_not_found"),
+            code=ERROR_CODES.get("session_not_found", "session_not_found"),
+            message="Session not found",
             status=404,
         )
 
     if session.status not in JOINABLE_STATUSES:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_joinable", "session_not_joinable"),
+            code=ERROR_CODES.get("session_not_joinable", "session_not_joinable"),
+            message="Session is not joinable",
             status=400,
         )
 
     if Player.objects.filter(session=session, nickname__iexact=nickname).exists():
         return api_error(
-            request,
-            key=ERROR_CODES.get("nickname_taken", "nickname_taken"),
+            code=ERROR_CODES.get("nickname_taken", "nickname_taken"),
+            message="Nickname already taken",
             status=409,
         )
 
@@ -190,8 +190,8 @@ def session_detail(request: HttpRequest, code: str) -> JsonResponse:
         session = GameSession.objects.get(code=session_code)
     except GameSession.DoesNotExist:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_found", "session_not_found"),
+            code=ERROR_CODES.get("session_not_found", "session_not_found"),
+            message="Session not found",
             status=404,
         )
 
@@ -251,8 +251,8 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
 
     if not category_slug:
         return api_error(
-            request,
-            key=ERROR_CODES.get("category_slug_required", "category_slug_required"),
+            code=ERROR_CODES.get("category_slug_required", "category_slug_required"),
+            message="category_slug is required",
             status=400,
         )
 
@@ -262,8 +262,8 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
         session = GameSession.objects.get(code=session_code)
     except GameSession.DoesNotExist:
         return api_error(
-            request,
-            key=ERROR_CODES.get("session_not_found", "session_not_found"),
+            code=ERROR_CODES.get("session_not_found", "session_not_found"),
+            message="Session not found",
             status=404,
         )
 
@@ -272,8 +272,8 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
 
     if session.status != GameSession.Status.LOBBY:
         return api_error(
-            request,
-            key=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
+            code=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
+            message="Round can only be started from lobby",
             status=400,
         )
 
@@ -281,8 +281,8 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
         category = Category.objects.get(slug=category_slug, is_active=True)
     except Category.DoesNotExist:
         return api_error(
-            request,
-            key=ERROR_CODES.get("category_not_found", "category_not_found"),
+            code=ERROR_CODES.get("category_not_found", "category_not_found"),
+            message="Category not found",
             status=404,
         )
 
@@ -293,8 +293,8 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
         session = GameSession.objects.select_for_update().get(pk=session.pk)
         if session.status != GameSession.Status.LOBBY:
             return api_error(
-                request,
-                key=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
+                code=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
+                message="Round can only be started from lobby",
                 status=400,
             )
 
@@ -305,8 +305,8 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
         )
         if not created:
             return api_error(
-                request,
-                key=ERROR_CODES.get("round_already_configured", "round_already_configured"),
+                code=ERROR_CODES.get("round_already_configured", "round_already_configured"),
+                message="Round already configured",
                 status=409,
             )
 

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

shared/i18n/lobby.json

@@ -1,266 +1,14 @@
 {
-  "locales": {
-    "default": "en",
-    "supported": [
-      "en",
-      "da"
-    ]
-  },
   "frontend": {
     "errors": {
-      "session_code_required": {
-        "en": "Session code is required.",
-        "da": "Sessionskoden er påkrævet."
-      },
-      "session_fetch_failed": {
-        "en": "Could not load lobby status.",
-        "da": "Kunne ikke indlæse lobby-status."
-      },
-      "join_failed": {
-        "en": "Join failed. Check code or nickname and try again.",
-        "da": "Kunne ikke joine. Tjek kode eller kaldenavn og prøv igen."
-      },
-      "start_round_failed": {
-        "en": "Could not start round. Refresh the lobby and try again.",
-        "da": "Kunne ikke starte runden. Opdater lobbyen og prøv igen."
-      },
-      "session_not_found": {
-        "en": "Session code is invalid or the session no longer exists.",
-        "da": "Sessionskoden er ugyldig, eller sessionen findes ikke længere."
-      },
-      "nickname_invalid": {
-        "en": "Nickname must be between 2 and 40 characters.",
-        "da": "Kaldenavn skal være mellem 2 og 40 tegn."
-      },
-      "nickname_taken": {
-        "en": "Nickname is already taken.",
-        "da": "Kaldenavnet er allerede taget."
-      },
-      "unknown": {
-        "en": "Action failed. Refresh status and try again.",
-        "da": "Handlingen fejlede. Opdater status og prøv igen."
-      }
-    },
-    "ui": {
-      "common": {
-        "refresh": {
-          "en": "Refresh",
-          "da": "Opdatér"
-        },
-        "retry": {
-          "en": "Retry",
-          "da": "Prøv igen"
-        },
-        "back_to_join": {
-          "en": "Back to join",
-          "da": "Tilbage til join"
-        },
-        "session_code": {
-          "en": "Session code",
-          "da": "Sessionskode"
-        },
-        "status": {
-          "en": "Status",
-          "da": "Status"
-        },
-        "prompt": {
-          "en": "Prompt",
-          "da": "Spørgsmål"
-        },
-        "round_question_id": {
-          "en": "Round question id",
-          "da": "Rundespørgsmål-id"
-        },
-        "round": {
-          "en": "round",
-          "da": "runde"
-        }
-      },
-      "app": {
-        "title": {
-          "en": "WPP Angular Shell",
-          "da": "WPP Angular Shell"
-        },
-        "host_nav": {
-          "en": "Host",
-          "da": "Vært"
-        },
-        "player_nav": {
-          "en": "Player",
-          "da": "Spiller"
-        },
-        "language_label": {
-          "en": "Language",
-          "da": "Sprog"
-        }
-      },
-      "host": {
-        "title": {
-          "en": "Host gameplay flow",
-          "da": "Vært gameplay-flow"
-        },
-        "category": {
-          "en": "Category",
-          "da": "Kategori"
-        },
-        "start_round": {
-          "en": "Start round",
-          "da": "Start runde"
-        },
-        "show_question": {
-          "en": "Show question",
-          "da": "Vis spørgsmål"
-        },
-        "mix_answers": {
-          "en": "Mix answers → guess",
-          "da": "Bland svar → gæt"
-        },
-        "calculate_scores": {
-          "en": "Calculate scores → reveal",
-          "da": "Udregn score → afslør"
-        },
-        "load_scoreboard": {
-          "en": "Load scoreboard",
-          "da": "Hent scoreboard"
-        },
-        "start_next_round": {
-          "en": "Start next round",
-          "da": "Start næste runde"
-        },
-        "finish_game": {
-          "en": "Finish game",
-          "da": "Afslut spil"
-        },
-        "retry_scoreboard": {
-          "en": "Retry scoreboard",
-          "da": "Prøv scoreboard igen"
-        },
-        "retry_next_round": {
-          "en": "Retry next round",
-          "da": "Prøv næste runde igen"
-        },
-        "retry_finish": {
-          "en": "Retry finish game",
-          "da": "Prøv afslutning igen"
-        },
-        "session_refresh_failed": {
-          "en": "Session refresh failed",
-          "da": "Kunne ikke opdatere session"
-        },
-        "scoreboard_failed": {
-          "en": "Scoreboard failed",
-          "da": "Scoreboard fejlede"
-        },
-        "next_round_failed": {
-          "en": "Next round failed",
-          "da": "Næste runde fejlede"
-        },
-        "finish_game_failed": {
-          "en": "Finish game failed",
-          "da": "Afslutning fejlede"
-        },
-        "session_code_required": {
-          "en": "Session code is required",
-          "da": "Sessionskode er påkrævet"
-        },
-        "final_leaderboard": {
-          "en": "Final leaderboard",
-          "da": "Finale leaderboard"
-        },
-        "winner": {
-          "en": "Winner",
-          "da": "Vinder"
-        },
-        "audio_locale_hint": {
-          "en": "Host locale for audio references",
-          "da": "Værtens locale for lydreferencer"
-        }
-      },
-      "player": {
-        "title": {
-          "en": "Player gameplay flow",
-          "da": "Spiller gameplay-flow"
-        },
-        "nickname": {
-          "en": "Nickname",
-          "da": "Kaldenavn"
-        },
-        "join": {
-          "en": "Join",
-          "da": "Join"
-        },
-        "lie_label": {
-          "en": "Lie",
-          "da": "Løgn"
-        },
-        "submit_lie": {
-          "en": "Submit lie",
-          "da": "Send løgn"
-        },
-        "retry_lie_submit": {
-          "en": "Retry lie submit",
-          "da": "Prøv løgn igen"
-        },
-        "submit_guess": {
-          "en": "Submit guess",
-          "da": "Send gæt"
-        },
-        "retry_guess_submit": {
-          "en": "Retry guess submit",
-          "da": "Prøv gæt igen"
-        },
-        "final_leaderboard": {
-          "en": "Final leaderboard",
-          "da": "Finale leaderboard"
-        },
-        "reconnecting_text": {
-          "en": "Reconnecting… trying to refresh session state.",
-          "da": "Forbinder igen… prøver at opdatere session."
-        },
-        "offline_text": {
-          "en": "You are offline. Reconnect to continue gameplay.",
-          "da": "Du er offline. Forbind igen for at fortsætte."
-        },
-        "retry_now": {
-          "en": "Retry now",
-          "da": "Prøv nu"
-        },
-        "loading_refresh": {
-          "en": "Loading latest session state…",
-          "da": "Indlæser seneste session-status…"
-        },
-        "loading_join": {
-          "en": "Joining session… restoring your player state.",
-          "da": "Joiner session… gendanner spillerstatus."
-        },
-        "loading_submit_lie": {
-          "en": "Submitting lie… waiting for guess phase.",
-          "da": "Sender løgn… venter på gættefase."
-        },
-        "loading_submit_guess": {
-          "en": "Submitting guess… waiting for reveal.",
-          "da": "Sender gæt… venter på afsløring."
-        },
-        "session_refresh_failed": {
-          "en": "Session refresh failed",
-          "da": "Kunne ikke opdatere session"
-        },
-        "join_failed": {
-          "en": "Join failed",
-          "da": "Join fejlede"
-        },
-        "lie_submit_failed": {
-          "en": "Lie submit failed",
-          "da": "Løgn-fejl"
-        },
-        "guess_submit_failed": {
-          "en": "Guess submit failed",
-          "da": "Gætte-fejl"
-        }
-      }
-    },
-    "capabilities": {
-      "client_has_no_audio_output": true
+      "session_code_required": "Session code is required.",
+      "session_fetch_failed": "Could not load lobby status.",
+      "join_failed": "Join failed. Check code or nickname and try again.",
+      "start_round_failed": "Could not start round. Refresh the lobby and try again.",
+      "session_not_found": "Session code is invalid or the session no longer exists.",
+      "nickname_invalid": "Nickname must be between 2 and 40 characters.",
+      "nickname_taken": "Nickname is already taken.",
+      "unknown": "Action failed. Refresh status and try again."
     }
   },
   "backend": {
@@ -274,44 +22,6 @@
       "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"
-      }
     }
   }
-}
+}