refactor(web): migrate frontend to Tailwind CSS and Vike SSR

- Replace Mantine UI components with Tailwind CSS v4
- Migrate from static HTML to Vike-based SSR framework
- Disable SSR for game page (Emscripten requires browser environment)
- Simplify Emscripten loading to avoid hydration conflicts
- Remove Tailwind download logic from web.build.ts
- Add package manager lockfiles for reproducible builds
- Update .gitignore for node_modules and build artifacts

.gitignore

@@ -1,12 +1,20 @@
 # IDE, Other files
 .vscode
 .idea
+.claude/
 rust-sdl2-emscripten/
 
 # Build files
 target/
 dist/
 emsdk/
+node_modules/
+
+# Emscripten build outputs (generated by cargo build)
+web/public/pacman.data
+web/public/pacman.js
+web/public/pacman.wasm
+web/public/pacman.wasm.map
 
 # Site build f iles
 tailwindcss-*