feat: voice assistant integration, PiP window fixes, widget improvements and pixel art scrollbar

- Android voice assistant: RecognitionService, VoiceInteractionSession with startAssistantActivity, es-HN speech recognition
- Voice transcript sent to first alive terminal via WebSocket, opens FloatingTranscriptDebug on correct session
- PiP window: fix close button using getCurrentWebviewWindow(), add mini/restore toggle, remove alwaysOnTop
- Add webview-close and window-destroy permissions to capabilities
- Pixel art ocean scrollbar on /transcript-debug respecting scroll nav mode settings
- Widget improvements: terminal list service, input widget provider, updated layouts

src-tauri/tauri.conf.json

@@ -6,7 +6,7 @@
   "build": {
     "frontendDist": "../frontend/dist",
     "devUrl": "http://localhost:4100",
-    "beforeDevCommand": "",
+    "beforeDevCommand": "cd frontend && bun run dev --host --port 4100",
     "beforeBuildCommand": "cd frontend && npx vite build"
   },
   "app": {
@@ -18,6 +18,7 @@
         "minWidth": 800,
         "minHeight": 600,
         "decorations": false,
+        "transparent": true,
         "resizable": true
       }
     ],