Fix admin panel authentication and navigation for static export

- Replace router.push with window.location.href for reliable redirects
- Fix auth check to wait for component mount before accessing localStorage
- Ensure proper redirect after successful login
- Fix redirect behavior on all admin pages (dashboard, colors, requests)

app/upadaj/dashboard/page.tsx

@@ -123,13 +123,16 @@ export default function AdminDashboard() {
 
   // Check authentication
   useEffect(() => {
+    // Wait for component to mount to avoid SSR issues with localStorage
+    if (!mounted) return;
+
     const token = localStorage.getItem('authToken');
     const expiry = localStorage.getItem('tokenExpiry');
-    
+
     if (!token || !expiry || Date.now() > parseInt(expiry)) {
-      router.push('/upadaj');
+      window.location.href = '/upadaj';
     }
-  }, [router]);
+  }, [mounted]);
 
   // Fetch filaments
   const fetchFilaments = async () => {