fix: resolve peer isolation and invitation link sync issues

extension/popup.html

@@ -315,6 +315,12 @@
             <p>• Username helps others identify you.</p>
             <p>• Noise filtering uses a blacklist to hide common non-video sites (e.g. Search, Social Media) from the Target Tab selector.</p>
         </div>
+
+        <div style="margin-top: 15px; padding: 8px; border-top: 1px solid var(--card);">
+            <label>Troubleshooting</label>
+            <button id="regenId" class="secondary" style="width: 100%; font-size: 11px;">Regenerate Peer ID</button>
+            <p style="font-size: 9px; color: var(--text-muted); margin-top: 5px; text-align: center;">Use this if you see "Duplicate Identity" errors.</p>
+        </div>
     </div>
 
     <!-- Dev Tab -->