verify paste length on server

src/app/(pages)/page.tsx

@@ -18,15 +18,6 @@ export default function Home(): ReactElement {
       return;
     }
 
-    // Limit the paste size to 400,000 characters
-    if (value.length > 400_000) {
-      toast({
-        title: "Paste",
-        description: "Pastes can't be longer than 400,000 characters",
-      });
-      return;
-    }
-
     // Upload the paste to the server
     const response = await fetch(
       `${process.env.NEXT_PUBLIC_API_ENDPOINT}/upload`,
@@ -39,8 +30,17 @@ export default function Home(): ReactElement {
       },
     );
 
-    // Redirect to the new paste
     const data = await response.json();
+
+    if (!response.ok) {
+      toast({
+        title: "Paste",
+        description: data.message,
+      });
+      return;
+    }
+
+    // Redirect to the new paste
     window.location.href = `/${data.id}`;
   }