Migrate to Vite for proper production builds with code splitting and optimization

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

package.json

@@ -4,16 +4,18 @@
   "type": "module",
   "private": true,
   "scripts": {
-    "dev": "bun --hot server.ts",
-    "start": "bun server.ts",
-    "build": "bun build src/main.tsx --outdir ./public/dist --target browser --minify"
+    "dev": "vite",
+    "start": "vite preview",
+    "build": "vite build"
   },
   "devDependencies": {
     "@types/bun": "latest",
     "@types/react": "^19.2.8",
     "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^5.1.2",
     "autoprefixer": "^10.4.23",
-    "postcss": "^8.5.6"
+    "postcss": "^8.5.6",
+    "vite": "^7.3.1"
   },
   "peerDependencies": {
     "typescript": "^5"