feat(web): wire auth pages with BetterAuth and route guards (#83)

Co-authored-by: Jason Woltje <[email protected]>
Co-committed-by: Jason Woltje <[email protected]>

apps/web/src/app/(auth)/layout.tsx

@@ -1,11 +1,14 @@
 import type { ReactNode } from 'react';
+import { GuestGuard } from '@/components/guest-guard';
 
 export default function AuthLayout({ children }: { children: ReactNode }): React.ReactElement {
   return (
-    <div className="flex min-h-screen items-center justify-center bg-surface-bg">
-      <div className="w-full max-w-md rounded-xl border border-surface-border bg-surface-card p-8 shadow-lg">
-        {children}
+    <GuestGuard>
+      <div className="flex min-h-screen items-center justify-center bg-surface-bg">
+        <div className="w-full max-w-md rounded-xl border border-surface-border bg-surface-card p-8 shadow-lg">
+          {children}
+        </div>
       </div>
-    </div>
+    </GuestGuard>
   );
 }