fix(frontend): make wallet page full-width to match other dashboard pages

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/app/[lang]/dashboard/wallet/page.tsx

@@ -102,7 +102,7 @@ export default function WalletPage() {
   const isPending = chargeMutation.isPending || gatewayMutation.isPending;
 
   return (
-    <div className="max-w-3xl mx-auto space-y-6 animate-fade-in">
+    <div className="space-y-6 animate-fade-in">
       <div>
         <h1 className="page-title flex items-center gap-2"><Wallet className="w-6 h-6" /> {w.title}</h1>
         <p className="page-subtitle">{w.subtitle}</p>