fix(WebRTCManager, callStore): improve signaling state handling and media track management

- Enhanced ontrack event handling to construct remote streams and avoid duplicate tracks during renegotiation.
- Updated negotiation logic to ensure it only occurs when the signaling state is stable and the instance is the initiator.
- Added diagnostic logging for offer and answer SDP to assist in debugging video track handling.
- Improved rollback logic in callStore to handle signaling state checks more robustly after rollback attempts.

src/stores/callStore.ts

@@ -202,7 +202,7 @@ async function handleIncomingOffer(msg: WSCallSDPMessage, myUserId: string): Pro
     return;
   }
 
-  const signalingState = pc.signalingState;
+  let signalingState = pc.signalingState;
   console.log('[CallStore] Received offer, signalingState:', signalingState);
 
   // Glare handling: if we're not in stable state, we have a conflict
@@ -223,6 +223,16 @@ async function handleIncomingOffer(msg: WSCallSDPMessage, myUserId: string): Pro
       await webrtcManager.rollback();
     } catch (err) {
       console.error('[CallStore] Rollback failed:', err);
+      // If rollback fails because we're already stable, that's fine - just proceed
+      if (pc.signalingState !== 'stable') {
+        return;
+      }
+    }
+
+    // Re-check state after rollback
+    signalingState = pc.signalingState;
+    if (signalingState !== 'stable') {
+      console.warn('[CallStore] Not stable after rollback, state:', signalingState);
       return;
     }
   }