refactor: repartition server-side and client-side code

app/.client/utils/format.ts

@@ -0,0 +1,12 @@
+export function formatSize(bytes: number): string {
+  const units = ['B', 'KB', 'MB', 'GB', 'TB'];
+  let size = bytes;
+  let unitIndex = 0;
+
+  while (size >= 1024 && unitIndex < units.length - 1) {
+    size /= 1024;
+    unitIndex++;
+  }
+
+  return `${size.toFixed(1)} ${units[unitIndex]}`;
+}