Phase 6: Llama-server manager, settings UI, packaging, and polish

- Implement LlamaManager in Rust for llama-server lifecycle: spawn with
  port allocation, health check, clean shutdown on Drop, model listing
- Add llama_start/stop/status/list_models Tauri commands
- Add load_settings/save_settings commands with JSON persistence
- Build SettingsModal with tabs for Transcription, AI Provider, Local AI
  settings (model size, device, language, API keys, provider selection)
- Wire settings into pipeline calls (model, device, language, skip diarization)
- Configure Tauri packaging: asset protocol for local audio files,
  CSP policy, bundle metadata, Linux .deb/.AppImage and Windows .msi config
- Add keyboard shortcuts: Space (play/pause), Ctrl+O (import),
  Ctrl+, (settings), Escape (close menus/modals)
- Close export dropdown on outside click
- Tests: 30 Python, 6 Rust, 0 Svelte errors

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/routes/+page.svelte

@@ -6,11 +6,58 @@
   import SpeakerManager from '$lib/components/SpeakerManager.svelte';
   import AIChatPanel from '$lib/components/AIChatPanel.svelte';
   import ProgressOverlay from '$lib/components/ProgressOverlay.svelte';
+  import SettingsModal from '$lib/components/SettingsModal.svelte';
   import { segments, speakers } from '$lib/stores/transcript';
+  import { settings, loadSettings } from '$lib/stores/settings';
   import type { Segment, Speaker } from '$lib/types/transcript';
+  import { onMount } from 'svelte';
 
   let waveformPlayer: WaveformPlayer;
   let audioUrl = $state('');
+  let showSettings = $state(false);
+
+  onMount(() => {
+    loadSettings();
+
+    // Global keyboard shortcuts
+    function handleKeyDown(e: KeyboardEvent) {
+      // Don't trigger shortcuts when typing in inputs
+      const tag = (e.target as HTMLElement)?.tagName;
+      if (tag === 'INPUT' || tag === 'TEXTAREA' || tag === 'SELECT') return;
+
+      if (e.key === ' ' && !e.ctrlKey && !e.metaKey) {
+        e.preventDefault();
+        waveformPlayer?.togglePlayPause?.();
+      } else if (e.key === 'o' && (e.ctrlKey || e.metaKey)) {
+        e.preventDefault();
+        handleFileImport();
+      } else if (e.key === ',' && (e.ctrlKey || e.metaKey)) {
+        e.preventDefault();
+        showSettings = true;
+      } else if (e.key === 'Escape') {
+        showExportMenu = false;
+        showSettings = false;
+      }
+    }
+
+    // Close export dropdown on outside click
+    function handleClickOutside(e: MouseEvent) {
+      if (showExportMenu) {
+        const target = e.target as HTMLElement;
+        if (!target.closest('.export-dropdown')) {
+          showExportMenu = false;
+        }
+      }
+    }
+
+    document.addEventListener('keydown', handleKeyDown);
+    document.addEventListener('click', handleClickOutside);
+
+    return () => {
+      document.removeEventListener('keydown', handleKeyDown);
+      document.removeEventListener('click', handleClickOutside);
+    };
+  });
   let isTranscribing = $state(false);
   let transcriptionProgress = $state(0);
   let transcriptionStage = $state('');
@@ -61,7 +108,13 @@
         duration_ms: number;
         speakers: string[];
         num_speakers: number;
-      }>('run_pipeline', { filePath });
+      }>('run_pipeline', {
+        filePath,
+        model: $settings.transcription_model || undefined,
+        device: $settings.transcription_device || undefined,
+        language: $settings.transcription_language || undefined,
+        skipDiarization: $settings.skip_diarization || undefined,
+      });
 
       // Create speaker entries from pipeline result
       const newSpeakers: Speaker[] = (result.speakers || []).map((label, idx) => ({
@@ -167,6 +220,9 @@
     <button class="import-btn" onclick={handleFileImport}>
       Import Audio/Video
     </button>
+    <button class="settings-btn" onclick={() => showSettings = true} title="Settings">
+      Settings
+    </button>
     {#if $segments.length > 0}
       <div class="export-dropdown">
         <button class="export-btn" onclick={() => showExportMenu = !showExportMenu}>
@@ -204,6 +260,11 @@
   message={transcriptionMessage}
 />
 
+<SettingsModal
+  visible={showSettings}
+  onClose={() => showSettings = false}
+/>
+
 <style>
   .app-header {
     display: flex;
@@ -235,6 +296,19 @@
     gap: 0.5rem;
     align-items: center;
   }
+  .settings-btn {
+    background: none;
+    border: 1px solid #4a5568;
+    color: #e0e0e0;
+    padding: 0.5rem 0.75rem;
+    border-radius: 6px;
+    cursor: pointer;
+    font-size: 0.875rem;
+  }
+  .settings-btn:hover {
+    background: rgba(255,255,255,0.05);
+    border-color: #e94560;
+  }
   .export-dropdown {
     position: relative;
   }