initial commit

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/admin/hooks/useModalLock.ts

@@ -0,0 +1,14 @@
+import { useEffect } from 'react'
+
+export default function useModalLock(isOpen: boolean): void {
+  useEffect(() => {
+    if (isOpen) {
+      document.body.style.overflow = 'hidden'
+    } else {
+      document.body.style.overflow = ''
+    }
+    return () => {
+      document.body.style.overflow = ''
+    }
+  }, [isOpen])
+}