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/capabilities/default.json

@@ -2,7 +2,7 @@
   "$schema": "https://raw.githubusercontent.com/tauri-apps/tauri/dev/crates/tauri-utils/schema.json",
   "identifier": "default",
   "description": "Default permissions for Agent UI",
-  "windows": ["main"],
+  "windows": ["main", "pip-terminal"],
   "permissions": [
     "core:default",
     {
@@ -17,10 +17,20 @@
     "clipboard-manager:default",
     "dialog:default",
     "core:window:default",
+    "core:window:allow-create",
     "core:window:allow-minimize",
     "core:window:allow-maximize",
     "core:window:allow-unmaximize",
     "core:window:allow-toggle-maximize",
-    "core:window:allow-close"
+    "core:window:allow-close",
+    "core:window:allow-set-always-on-top",
+    "core:window:allow-set-size",
+    "core:window:allow-set-position",
+    "core:window:allow-set-focus",
+    "core:window:allow-set-decorations",
+    "core:webview:default",
+    "core:webview:allow-create-webview-window",
+    "core:webview:allow-webview-close",
+    "core:window:allow-destroy"
   ]
 }