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Co-Authored-By: Claude <noreply@anthropic.com>

web/src/hooks/useIsMobile.js

@@ -0,0 +1,16 @@
+export const MOBILE_BREAKPOINT = 768;
+
+import { useSyncExternalStore } from 'react';
+
+export const useIsMobile = () => {
+  const query = `(max-width: ${MOBILE_BREAKPOINT - 1}px)`;
+  return useSyncExternalStore(
+    (callback) => {
+      const mql = window.matchMedia(query);
+      mql.addEventListener('change', callback);
+      return () => mql.removeEventListener('change', callback);
+    },
+    () => window.matchMedia(query).matches,
+    () => false,
+  );
+};