Issue #250: enforce primary-device-only audio policy guardrail

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

@@ -443,4 +443,35 @@ describe('PlayerShellComponent gameplay wiring', () => {
     secondComponent.ngOnDestroy();
     await expect(mediaPrototype.play()).rejects.toThrow('original play');
   });
+
+  it('does not trigger original media play during player-shell init path', () => {
+    const originalPlay = vi.fn().mockResolvedValue(undefined);
+    const mediaPrototype = { play: originalPlay };
+
+    vi.stubGlobal('window', {
+      location: { hash: '', search: '' },
+      history: { state: null, replaceState: vi.fn() },
+      localStorage: { getItem: vi.fn().mockReturnValue('en'), setItem: vi.fn(), removeItem: vi.fn() },
+      sessionStorage: { getItem: vi.fn().mockReturnValue(null), setItem: vi.fn(), removeItem: vi.fn() },
+      HTMLMediaElement: { prototype: mediaPrototype },
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+    });
+    vi.stubGlobal('navigator', { language: 'en-US', onLine: true });
+
+    const component = new PlayerShellComponent();
+    component.ngOnInit();
+
+    expect(originalPlay).not.toHaveBeenCalled();
+
+    component.ngOnDestroy();
+  });
+
+  it('exposes i18n warning copy for phone-client audio policy', () => {
+    const component = new PlayerShellComponent();
+
+    expect(component.copy('player.audio_policy_notice')).not.toBe('player.audio_policy_notice');
+    expect(component.copy('player.audio_policy_notice')).toContain('Audio');
+  });
+
 });

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

@@ -45,6 +45,7 @@ function resolveLocalStorage(): Storage | undefined {
   imports: [CommonModule, FormsModule],
   template: `
     <h2>{{ copy('player.title') }}</h2>
+    <p *ngIf="clientHasNoAudioOutput" class="hint">{{ copy('player.audio_policy_notice') }}</p>
 
     <div class="panel" [attr.data-client-has-no-audio-output]="clientHasNoAudioOutput">
       <label>{{ copy('common.session_code') }} <input [(ngModel)]="sessionCode" /></label>