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.

frontend/src/lib/tauri.ts

@@ -83,3 +83,8 @@ export async function getTauriClipboard() {
 export async function getTauriDialog() {
   return import('@tauri-apps/plugin-dialog')
 }
+
+export async function getTauriWindow() {
+  const { getCurrentWindow } = await import('@tauri-apps/api/window')
+  return getCurrentWindow()
+}