feat(voice): per-account choice between Whisper and the browser; STT_ALLOW_BROWSER

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/lib/__tests__/voice.preference.test.ts

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+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+const getAuthStatus = vi.fn();
+vi.mock('../api', () => ({ api: { getAuthStatus: (...a: any[]) => getAuthStatus(...a) } }));
+
+import { loadVoiceConfig, resetVoiceConfig, setVoicePreference, voiceChoiceAvailable } from '../voice';
+
+// Recording and recognition as far as jsdom needs them to count as available
+(window as any).MediaRecorder = function () {};
+Object.defineProperty(navigator, 'mediaDevices', { value: { getUserMedia: vi.fn() }, configurable: true });
+(window as any).webkitSpeechRecognition = function () {};
+
+afterEach(() => {
+  resetVoiceConfig();
+  getAuthStatus.mockReset();
+});
+
+describe('voice input: Whisper or browser per account', () => {
+  it('uses the browser when the account picked it and the server allows it', async () => {
+    getAuthStatus.mockResolvedValue({ voice: { mode: 'server', maxSeconds: 600, browserAllowed: true } });
+    expect((await loadVoiceConfig()).mode).toBe('server');
+    expect(voiceChoiceAvailable()).toBe(true);
+    setVoicePreference('browser');
+    expect((await loadVoiceConfig()).mode).toBe('browser');
+    setVoicePreference('');
+    expect((await loadVoiceConfig()).mode).toBe('server');
+  });
+
+  it('keeps Whisper when the server forbids the browser (STT_ALLOW_BROWSER=false)', async () => {
+    getAuthStatus.mockResolvedValue({ voice: { mode: 'server', maxSeconds: 600, browserAllowed: false } });
+    setVoicePreference('browser');
+    expect((await loadVoiceConfig()).mode).toBe('server');
+    expect(voiceChoiceAvailable()).toBe(false);
+  });
+
+  it('offers no choice without a Whisper server', async () => {
+    getAuthStatus.mockResolvedValue({ voice: { mode: 'browser', maxSeconds: 600, browserAllowed: true } });
+    await loadVoiceConfig();
+    expect(voiceChoiceAvailable()).toBe(false);
+  });
+});