feat: Samsung lock screen face widget, voice assistant services, PiP mode and gitignore installers

Add Samsung proprietary Face Widget (lock screen/AOD) with terminal status display.
Add voice interaction services (AgentVoiceInteractionService, RecognitionService) for
digital assistant registration. Add PiP mode with voice/expand actions. Add session-state
proxy, voice transcript routes, window controls component. Ignore installers/ directory.

src-tauri/capabilities/default.json

@@ -15,6 +15,12 @@
     "store:default",
     "notification:default",
     "clipboard-manager:default",
-    "dialog:default"
+    "dialog:default",
+    "core:window:default",
+    "core:window:allow-minimize",
+    "core:window:allow-maximize",
+    "core:window:allow-unmaximize",
+    "core:window:allow-toggle-maximize",
+    "core:window:allow-close"
   ]
 }