Enhance formatTimeAgo function to handle UTC timestamps and future timestamps

src/App.tsx

@@ -133,9 +133,13 @@ function App() {
     return hours.toLocaleString()
   }
 
-  // Format time ago from timestamp
+  // Format time ago from timestamp (API returns UTC timestamps)
   const formatTimeAgo = (timestamp: number) => {
-    const seconds = Math.floor((Date.now() - timestamp) / 1000)
+    const now = Date.now() // Current local time
+    const utcNow = now - (new Date().getTimezoneOffset() * 60000) // Convert to UTC
+    const seconds = Math.floor((utcNow - timestamp) / 1000)
+    
+    if (seconds < 0) return 'just now' // Future timestamp
     if (seconds < 60) return `${seconds}s ago`
     const minutes = Math.floor(seconds / 60)
     if (minutes < 60) return `${minutes}m ago`