feat(CallFeature): implement call functionality and integrate WebSocket signaling

- Updated app.json to include microphone permissions and background audio support.
- Added call-related dependencies in package.json and package-lock.json.
- Enhanced ChatScreen to initiate calls and handle call actions.
- Introduced call components in the layout for incoming call handling.
- Expanded WebSocket service to manage call signaling messages and events.
- Refactored authStore to initialize call state on user authentication.

src/stores/index.ts

@@ -47,6 +47,7 @@ export {
 export {
   useHomeTabPressStore,
 } from './homeTabPressStore';
+export { callStore } from './callStore';
 export {
   useAppColors,
   useThemePreference,