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/gen/android/app/src/main/res/raw/facewidgets.json

@@ -0,0 +1,7 @@
+{
+  "agent_ui_transcript": {
+    "menuInSetting": 1,
+    "labelResNameInSetting": "face_widget_label",
+    "actionDetailSetting": "com.agentui.desktop.FACE_WIDGET_SETTINGS"
+  }
+}