config: add explicit module resolution for Vercel

- Add resolve.extensions to help with .js module resolution
- Include applesauce packages in optimizeDeps for better bundling
- Attempt to fix Vercel build issue with async-event-store.js

vite.config.ts

@@ -5,6 +5,12 @@ export default defineConfig({
   plugins: [react()],
   server: {
     port: 9802
+  },
+  resolve: {
+    extensions: ['.js', '.ts', '.tsx', '.json']
+  },
+  optimizeDeps: {
+    include: ['applesauce-core', 'applesauce-factory', 'applesauce-relay', 'applesauce-react']
   }
 })