fix: use Bun.serve() for proper HTMLBundle handling

- Switch to explicit Bun.serve() call
- Add route handler for static files since 'static' prop not in types yet

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/dev/server.tsx

@@ -1,12 +1,20 @@
 #!/usr/bin/env bun
 import index from "./index.html"
 
-export default {
+Bun.serve({
   port: 3000,
   routes: {
     "/": index,
+    "/public/*": async (req) => {
+      const path = new URL(req.url).pathname.replace("/public/", "")
+      const file = Bun.file(`./public/${path}`)
+      if (await file.exists()) {
+        return new Response(file)
+      }
+      return new Response("Not found", { status: 404 })
+    },
   },
-  static: {
-    "/public": "./public",
-  },
-}
+  development: true,
+})
+
+console.log("Dev server running at http://localhost:3000")