Feature 01 task 2: Vite React TypeScript web skeleton (#3)

Co-authored-by: dev_agent <dev_agent@cubecraftlabs.com>
Co-committed-by: dev_agent <dev_agent@cubecraftlabs.com>

web/src/App.tsx

@@ -0,0 +1,25 @@
+import { useState } from 'react'
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+import { Route, Routes } from 'react-router'
+
+// Placeholder shell only: no product UI, auth or API calls yet.
+function Shell() {
+  return (
+    <main>
+      <h1>MealQuest</h1>
+    </main>
+  )
+}
+
+// App expects to be rendered inside a router (BrowserRouter in main.tsx,
+// MemoryRouter in tests).
+export default function App() {
+  const [queryClient] = useState(() => new QueryClient())
+  return (
+    <QueryClientProvider client={queryClient}>
+      <Routes>
+        <Route path="*" element={<Shell />} />
+      </Routes>
+    </QueryClientProvider>
+  )
+}