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.

package-lock.json

@@ -54,6 +54,7 @@
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