feat: export App as default from core-ui package

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

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

apps/vendor/src/main.tsx

@@ -1,7 +1,7 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import '@mercurjs/core-ui/index.css'
-import App from '@mercurjs/core-ui/app'
+import App from '@mercurjs/core-ui'
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>

apps/vendor/src/sidebar.tsx

@@ -1,3 +1,3 @@
 export function Sidebar() {
-    return <div>Sidebar 123123</div>
+    return null
 }

packages/core-ui/package.json

@@ -9,10 +9,6 @@
       "types": "./dist/index.d.ts",
       "import": "./dist/index.js"
     },
-    "./app": {
-      "types": "./dist/app.d.ts",
-      "import": "./dist/app.js"
-    },
     "./vite-plugin": {
       "types": "./dist/vite-plugin/index.d.ts",
       "import": "./dist/vite-plugin/index.cjs"

packages/core-ui/src/app.tsx

@@ -10,8 +10,6 @@ import { Toaster, TooltipProvider } from "@medusajs/ui"
 const queryClient = new QueryClient()
 
 export default function App() {
-
-
   return (
     <TooltipProvider>
       <HelmetProvider>

packages/core-ui/src/index.ts

@@ -5,3 +5,5 @@ export interface MercurConfig {
         Sidebar?: string
     }
 }
+
+export { default } from './app'

packages/core-ui/tsup.config.ts

@@ -2,7 +2,7 @@ import { defineConfig } from "tsup"
 
 export default defineConfig([
   {
-    entry: ['src/index.css', 'src/app.tsx', 'src/index.ts'],
+    entry: ['src/index.ts', 'src/index.css'],
     format: ["esm"],
     dts: true,
     clean: true,