feat(audio): load input devices + setMicrophone in settings store (FR-CAP-7)

src/lib/stores/settings.svelte.ts

@@ -35,6 +35,8 @@ const DEFAULT_SETTINGS: AppSettings = {
   pst_last_path: null,
   pst_auto_sync: false,
   audio_output_device: null, // system default render device (FR-CAP-1)
+  microphone_enabled: true, // capture the user's mic into the transcript (FR-CAP-7)
+  audio_input_device: null, // system default capture device
 };
 
 class SettingsStore {
@@ -50,6 +52,7 @@ class SettingsStore {
   hardware = $state<HardwareStatus | null>(null);
   models = $state<ModelInfo[]>([]);
   audioDevices = $state<AudioDeviceInfo[]>([]);
+  inputDevices = $state<AudioDeviceInfo[]>([]);
   downloadProgress = $state<Record<string, { received: number; total: number | null }>>({});
 
   // Privacy self-check (T7.6, FR-SEC-2).
@@ -75,6 +78,7 @@ class SettingsStore {
     }
     await this.loadHardware();
     await this.loadAudioDevices();
+    await this.loadInputDevices();
     await this.loadModels();
     await this.loadPrivacy();
     await this.loadLlmStatus();
@@ -141,6 +145,20 @@ class SettingsStore {
     await this.patch({ audio_output_device: deviceId });
   }
 
+  async loadInputDevices() {
+    try {
+      this.inputDevices = await api.listInputDevices();
+    } catch {
+      this.inputDevices = [];
+    }
+  }
+
+  /** Set the microphone selection in one patch (FR-CAP-7): `enabled=false`
+   * disables mic capture entirely; `deviceId=null` uses the system default. */
+  async setMicrophone(enabled: boolean, deviceId: string | null) {
+    await this.patch({ microphone_enabled: enabled, audio_input_device: deviceId });
+  }
+
   async loadModels() {
     try {
       this.models = await api.listModels();