feat: initialize React app with TanStack Router and Vitest for testing

- Added App component with basic structure and styling.
- Included CSS for app layout and animations.
- Integrated TanStack Router for routing management.
- Set up Vitest for testing with a basic test case for the App component.
- Added logo SVG for branding.
- Configured Vite for development with React and TanStack Devtools.
- Created reportWebVitals utility for performance measurement.
- Established global styles in styles.css.

my-app/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "my-app",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite --port 3000",
+    "build": "vite build && tsc",
+    "preview": "vite preview",
+    "test": "vitest run"
+  },
+  "dependencies": {
+    "@tanstack/react-devtools": "^0.7.0",
+    "@tanstack/react-router": "^1.132.0",
+    "@tanstack/react-router-devtools": "^1.132.0",
+    "react": "^19.2.0",
+    "react-dom": "^19.2.0"
+  },
+  "devDependencies": {
+    "@tanstack/devtools-vite": "^0.3.11",
+    "@testing-library/dom": "^10.4.0",
+    "@testing-library/react": "^16.2.0",
+    "@types/react": "^19.2.0",
+    "@types/react-dom": "^19.2.0",
+    "@vitejs/plugin-react": "^5.0.4",
+    "jsdom": "^27.0.0",
+    "typescript": "^5.7.2",
+    "vite": "^7.1.7",
+    "vitest": "^3.0.5",
+    "web-vitals": "^5.1.0"
+  }
+}