fix(react): add resolve.dedupe for react/react-dom to prevent CJS multi-instance

React 19.2.5 is pure CJS. Rollup's CJS→ESM interop can create separate scoped
ReactSharedInternals objects for react and react-dom, causing hooks to see a null
dispatcher on the server build. resolve.dedupe forces a single shared instance.

vite.config.ts

@@ -24,6 +24,7 @@ export default defineConfig({
         alias: {
             "@": path.resolve(__dirname, "./src"),
         },
+        dedupe: ["react", "react-dom"],
     },
     server: {
         host: true,