feat: Implement all 7 phases

src/hooks/useModerationQueue.ts

@@ -87,8 +87,11 @@ export const useModerationQueue = (config?: UseModerationQueueConfig) => {
     }
   }, [user]);
 
-  // Start countdown timer for lock expiry
+  // Start countdown timer for lock expiry with improved memory leak prevention
   const startLockTimer = useCallback((expiresAt: Date) => {
+    // Track if component is still mounted
+    let isMounted = true;
+    
     // Clear any existing timer first to prevent leaks
     if (lockTimerRef.current) {
       clearInterval(lockTimerRef.current);
@@ -96,6 +99,15 @@ export const useModerationQueue = (config?: UseModerationQueueConfig) => {
     }
 
     lockTimerRef.current = setInterval(() => {
+      // Prevent timer execution if component unmounted
+      if (!isMounted) {
+        if (lockTimerRef.current) {
+          clearInterval(lockTimerRef.current);
+          lockTimerRef.current = null;
+        }
+        return;
+      }
+
       const now = new Date();
       const timeLeft = expiresAt.getTime() - now.getTime();
 
@@ -119,7 +131,16 @@ export const useModerationQueue = (config?: UseModerationQueueConfig) => {
         }
       }
     }, 1000);
-  }, [toast, onLockStateChange]); // Add dependencies to avoid stale closures
+
+    // Return cleanup function
+    return () => {
+      isMounted = false;
+      if (lockTimerRef.current) {
+        clearInterval(lockTimerRef.current);
+        lockTimerRef.current = null;
+      }
+    };
+  }, [toast, onLockStateChange]);
 
   // Clean up timer on unmount
   useEffect(() => {