feat: apply various dashboard and auth fixes including demo trials, settings UI, and signup options

src/app/dashboard/page.tsx

@@ -59,7 +59,8 @@ export default function DashboardPage() {
     const isDark = typeof document !== 'undefined' && document.documentElement.classList.contains('dark');
     const themeParam = isDark ? 'dark' : 'light';
 
-    return `/api/og/dashboard?score=${encodeURIComponent(score)}&accuracy=${encodeURIComponent(accuracy)}&qs=${encodeURIComponent(qs)}&rank=${encodeURIComponent(rank)}&name=${encodeURIComponent(name)}&target=${target}&plan=${encodeURIComponent(plan)}&date=${encodeURIComponent(date)}&theme=${themeParam}`
+    if (!user) return "";
+    return `/api/og/dashboard/${user.id}?theme=${themeParam}&date=${encodeURIComponent(date)}`
   }
 
   const handleDownload = async () => {