Fix ICE candidate handling in connection manager

- Remove hardcoded sdpMLineIndex and sdpMid values
- Create RTCIceCandidate properly from candidate string
- Let WebRTC parse candidate metadata automatically
- Fixes ICE connection failures

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/connection.ts

@@ -246,11 +246,11 @@ export class RondevuConnection {
         );
 
         for (const candidate of candidates) {
-          await this.pc.addIceCandidate({
+          // Create ICE candidate from candidate string only
-            candidate: candidate.candidate,
+          // Don't hardcode sdpMLineIndex/sdpMid - let WebRTC parse from candidate string
-            sdpMLineIndex: 0,
+          await this.pc.addIceCandidate(new RTCIceCandidate({
-            sdpMid: '0'
+            candidate: candidate.candidate
-          });
+          }));
           this.lastIceTimestamp = candidate.createdAt;
         }
       } catch (err) {