Bring the codebase in line with CLAUDE.md conventions

- Convert getRouter, OrderingPage, and OrderStatusRoute from function
  declarations to arrow functions
- Migrate header-user.tsx off raw Tailwind classes onto a co-located
  SCSS module, and remove Tailwind entirely (deps, Vite plugin,
  styles.css) since it was the only consumer and duplicated the
  documented SCSS Modules system
- Fix CLAUDE.md's stale ~/ alias example and structure diagram to
  match the project's actual #/ and @/ aliases and directories

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.cta.json

@@ -2,7 +2,7 @@
   "projectName": "ghost-kitchen-scaffold",
   "mode": "file-router",
   "typescript": true,
-  "tailwind": true,
+  "tailwind": false,
   "packageManager": "npm",
   "git": false,
   "install": true,