Initial project setup: Vite 8 + React 19 + TypeScript + Tailwind v4 + React Router v7 + MUI v9

- Vite 8 with @tailwindcss/vite plugin (no PostCSS needed)
- Tailwind v4: imports only theme.css + utilities.css, skipping preflight
- MUI v9 with Emotion, CssBaseline replaces Tailwind preflight
- StyledEngineProvider injectFirst + CSS @layer order for correct cascade
- React Router v7 imported from react-router
- Home page demonstrating MUI components + Tailwind utility classes together

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}