style(debug): apply same max-width as reading view to debug page

src/components/Debug.tsx

@@ -89,7 +89,7 @@ const Debug: React.FC = () => {
   )
 
   return (
-    <div className="content-panel">
+    <div className="content-panel" style={{ maxWidth: '900px', margin: '0 auto' }}>
       <div className="mb-6">
         <h2 className="text-2xl font-bold mb-2">Debug / NIP-46 Tools</h2>
         <div className="flex items-center gap-2 mb-3">