fix(extension): harden target frame recovery and switching

extension/content.js

@@ -867,19 +867,30 @@
         if (wasDesynced) {
 
             runtimeMessage({ type: 'HCM_DESYNC_STATE', desynced: false }).catch(() => {});
-        }
-
-        // Resync to the host's current position (retries if host state not yet known).
-
-        hcmRequestHostSyncWithRetry();
-
-        reportLog('Host-only: resynced with the host', 'info');
-
+        }
+
+        // Resync to the host's current position (retries if host state not yet known).
+
+        hcmRequestHostSyncWithRetry();
+
+        reportLog('Host-only: resynced with the host', 'info');
+
+    }
+
+
+
     function hcmShowBadge() {
-
-
-
-    function hcmShowBadge() {
+
+        if (hcmBadgeHost) return;
+
+        if (!document.body) {
+
+            // Body not ready yet (very early injection). Defer until DOMReady,
+
+            // otherwise the desynced user silently never sees the badge (L-4).
+
+            if (!hcmBadgePending) {
+
                 hcmBadgePending = true;
 
                 const retry = () => {
@@ -907,8 +918,9 @@
 
         const b = hcmEl('div', 'position:fixed;z-index:2147483646;right:16px;bottom:16px;background:#c96736;color:#fff;font:13px/1.3 system-ui,sans-serif;padding:8px 12px;border-radius:10px;box-shadow:0 6px 20px rgba(0,0,0,.4);cursor:pointer;display:flex;align-items:center;gap:8px');
 
-
-            return;
+        b.append(hcmEl('span', null, '● ' + hcmStrings.badge), hcmEl('span', 'text-decoration:underline', hcmStrings.resync));
+
+        b.addEventListener('click', hcmExitDesync);
 
         root.appendChild(b);
 
@@ -1238,7 +1250,7 @@
                 bestRank = rank;
 
             }
-        for (const video of candidates) {
+
         }
 
         return best;
@@ -2062,7 +2074,7 @@
 
                     if (action === EVENTS.FORCE_SYNC_PREPARE) {
 
-            // force-sync flow actually waits on. Skipping CMD_ACKs for PLAY/PAUSE/SEEK
+                        runtimeMessage({ type: 'FORCE_SYNC_ACK' }).catch(() => {});
                     }
 
                     return;
@@ -2117,7 +2129,7 @@
 
             } else if (action === EVENTS.PAUSE) {
 
-
+                tryMediaAction(EVENTS.PAUSE);
 
                 runtimeMessage({ type: 'CMD_ACK', actionTimestamp: message.actionTimestamp, commandSenderId: message.commandSenderId });
                 actionCompleted = true;