feat(web): add smooth page transitions and WASM loading states

- Implement navigation state tracking with optimistic UI updates
- Add loading spinner and error handling for WASM initialization
- Insert browser yield points during game initialization to prevent freezing
- Redesign leaderboard with tabbed navigation and mock data structure
- Add utility CSS classes for consistent page layouts

web/pages/leaderboard/+config.ts

@@ -1,6 +1,6 @@
 import type { Config } from "vike/types";
 
 export default {
-  prerender: true,  // Generate static HTML for deployment
-  ssr: false,       // Force client-side only rendering
+  prerender: true, // Generate static HTML for deployment
+  ssr: false, // Force client-side only rendering
 } satisfies Config;