feat(ui): load/download/remove diarization models in the settings store

src/lib/stores/settings.svelte.ts

@@ -61,6 +61,10 @@ class SettingsStore {
   // Hardware + model management (Phase 3, T3.6/T3.7).
   hardware = $state<HardwareStatus | null>(null);
   models = $state<ModelInfo[]>([]);
+  // Speaker-diarization models (segmentation + embedding). Both must be
+  // installed before recordings separate speakers instead of labelling
+  // everything "S1" (T4.7, FR-MODEL-1).
+  diarizationModels = $state<ModelInfo[]>([]);
   // Transcription language catalog for the Settings dropdown (T8.7, FR-TRX-4).
   languages = $state<LanguageOption[]>([]);
   audioDevices = $state<AudioDeviceInfo[]>([]);
@@ -101,6 +105,7 @@ class SettingsStore {
     await this.loadAudioDevices();
     await this.loadInputDevices();
     await this.loadModels();
+    await this.loadDiarizationModels();
     await this.loadLanguages();
     await this.loadPrivacy();
     await this.loadLlmStatus();
@@ -199,6 +204,29 @@ class SettingsStore {
     }
   }
 
+  async loadDiarizationModels() {
+    try {
+      this.diarizationModels = await api.listDiarizationModels();
+    } catch {
+      this.diarizationModels = [];
+    }
+  }
+
+  /** Download one diarization model. The two known ids map to the backend's
+   * `diar-seg`/`diar-emb` kinds; `removeModel` needs no kind (it disambiguates
+   * by catalog membership). */
+  async downloadDiarizationModel(id: string) {
+    this.clearProgress(id);
+    await api.downloadModel(id, id.startsWith("seg") ? "diar-seg" : "diar-emb");
+    this.clearProgress(id);
+    await this.loadDiarizationModels();
+  }
+
+  async removeDiarizationModel(id: string) {
+    await api.removeModel(id);
+    await this.loadDiarizationModels();
+  }
+
   async loadLanguages() {
     try {
       this.languages = await api.listWhisperLanguages();