feat(CallScreen): enhance video call functionality and UI updates

- Integrated video call support by adding local and remote video stream handling.
- Implemented state management for video track detection in both local and peer streams.
- Updated UI to conditionally render video components based on the presence of video tracks.
- Added video toggle functionality to enable or disable local video during calls.
- Enhanced incoming call modal to display call type (voice or video).
- Refactored call store to manage call types and video state more effectively.

src/services/wsService.ts

@@ -718,10 +718,11 @@ class WebSocketService {
   }
 
   // Call signaling send methods
-  sendCallInvite(conversationId: string, calleeId: string): void {
+  sendCallInvite(conversationId: string, calleeId: string, callType: 'voice' | 'video' = 'voice'): void {
     this.sendFireAndForget('call_invite', {
       conversation_id: conversationId,
       callee_id: calleeId,
+      call_type: callType,
     });
   }