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>

eslint.config.js

@@ -0,0 +1,22 @@
+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import tseslint from 'typescript-eslint'
+import { defineConfig, globalIgnores } from 'eslint/config'
+
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      js.configs.recommended,
+      tseslint.configs.recommended,
+      reactHooks.configs.flat.recommended,
+      reactRefresh.configs.vite,
+    ],
+    languageOptions: {
+      globals: globals.browser,
+    },
+  },
+])