v0.18.5 - Fix duplicate answer processing regression

The activeOffer.answered flag was being set AFTER the async
setRemoteDescription() call, creating a race condition window
where the same answer could be processed multiple times.

Root cause:
- Check `!activeOffer.answered` happens
- setRemoteDescription() starts (async operation)
- Before it completes, another check could happen
- Same answer gets processed twice → "stable" state error

Fix:
- Set activeOffer.answered = true BEFORE setRemoteDescription
- Add try/catch to reset flag if setRemoteDescription fails
- This prevents duplicate processing while allowing retries on error

This regression was introduced when the answered flag assignment
was not moved along with other polling logic changes.

Fixes: #6 regression

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@xtr-dev/rondevu-client",
-  "version": "0.18.4",
+  "version": "0.18.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@xtr-dev/rondevu-client",
-      "version": "0.18.4",
+      "version": "0.18.5",
       "license": "MIT",
       "dependencies": {
         "@noble/ed25519": "^3.0.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/rondevu-client",
-  "version": "0.18.4",
+  "version": "0.18.5",
   "description": "TypeScript client for Rondevu with durable WebRTC connections, automatic reconnection, and message queuing",
   "type": "module",
   "main": "dist/index.js",

src/rondevu.ts

@@ -651,17 +651,25 @@ export class Rondevu extends EventEmitter {
                 if (activeOffer && !activeOffer.answered) {
                     this.debug(`Received answer for offer ${answer.offerId}`)
 
+                    // Mark as answered BEFORE setRemoteDescription to prevent race condition
+                    activeOffer.answered = true
+
+                    try {
                         await activeOffer.pc.setRemoteDescription({
                             type: 'answer',
                             sdp: answer.sdp
                         })
 
-                    activeOffer.answered = true
                         this.lastPollTimestamp = answer.answeredAt
                         this.emit('offer:answered', answer.offerId, answer.answererId)
 
                         // Create replacement offer
                         this.fillOffers()
+                    } catch (err) {
+                        // If setRemoteDescription fails, reset the answered flag
+                        activeOffer.answered = false
+                        throw err
+                    }
                 }
             }