feat: production-readiness pass

- Migrate login page to atelier design system (editorial modal style)
- Polish root error.tsx, not-found.tsx, loading.tsx with atelier design
- Add JSON-LD structured data: SoftwareApplication + LocalBusiness
- Fix next.config.ts outputFileTracingRoot absolute path warning
- Add force-dynamic to protected-example (uses cookies)
- Add proper type for stops page (replace : any)
- Fix unescaped quotes in StopTableClient
- Fix no-explicit-any in db-schema route
- Clean up console.logs in admin-permissions
- Fix inline any in admin/stops page
- Update OG image references to existing og-default.svg

src/app/protected-example/page.tsx

@@ -1,6 +1,11 @@
 import { getSession, signOut } from "@/lib/auth";
 import { redirect } from "next/navigation";
 
+// `getSession()` reads cookies(), which forces dynamic rendering.
+// Without this, Next.js tries to prerender this page at build time
+// and fails with "Dynamic server usage".
+export const dynamic = "force-dynamic";
+
 /**
  * /protected-example
  *