feature: localization's first implmentation

frontend/src/app/[locale]/(dashboard)/settings/account/page.tsx

@@ -0,0 +1,29 @@
+'use client';
+
+import { Link } from '@/i18n/navigation';
+
+export default function AccountSettingsPage() {
+  return (
+    <div className="space-y-6">
+      <div>
+        <Link
+          href="/today"
+          className="text-sm text-primary hover:opacity-90"
+        >
+          ← Back to app
+        </Link>
+        <h1 className="text-2xl font-semibold text-text-primary mt-4">Account</h1>
+        <p className="text-text-secondary text-sm mt-2">
+          Profile and security settings for your login.
+        </p>
+      </div>
+
+      <div className="surface-card p-6 space-y-3">
+        <p className="text-sm text-text-secondary">
+          Password change and profile editing will be wired here next (e.g. invite
+          flow, reset password).
+        </p>
+      </div>
+    </div>
+  );
+}