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-tauri/tauri.conf.json

@@ -20,7 +20,11 @@
       }
     ],
     "security": {
-      "csp": null
+      "csp": "default-src 'self'; img-src 'self' asset: https://asset.localhost; media-src 'self' asset: https://asset.localhost; style-src 'self' 'unsafe-inline'",
+      "assetProtocol": {
+        "enable": true,
+        "scope": ["**"]
+      }
     }
   },
   "bundle": {
@@ -32,6 +36,24 @@
       "icons/128x128@2x.png",
       "icons/icon.icns",
       "icons/icon.ico"
-    ]
+    ],
+    "category": "Utility",
+    "shortDescription": "Transcribe audio/video with speaker identification",
+    "longDescription": "Voice to Notes is a desktop application that transcribes audio and video recordings with speaker identification, synchronized playback, and AI-powered analysis. Export to SRT, WebVTT, ASS captions, or plain text.",
+    "copyright": "Voice to Notes Contributors",
+    "license": "MIT",
+    "linux": {
+      "deb": {
+        "depends": ["python3", "python3-pip"]
+      },
+      "appimage": {
+        "bundleMediaFramework": true
+      }
+    },
+    "windows": {
+      "wix": {
+        "language": "en-US"
+      }
+    }
   }
 }