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

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

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

@@ -1,6 +1,11 @@
 import type { ReactNode } from 'react';
 import { AppShell } from '@/components/layout/app-shell';
+import { AuthGuard } from '@/components/auth-guard';
 
 export default function DashboardLayout({ children }: { children: ReactNode }): React.ReactElement {
-  return <AppShell>{children}</AppShell>;
+  return (
+    <AuthGuard>
+      <AppShell>{children}</AppShell>
+    </AuthGuard>
+  );
 }