Scaffold design engineering playground

Next.js 16 + TypeScript + Tailwind v4 + Motion project showcasing
interface components built on semantic design tokens:

- Light/dark/system theming from one CSS variable set, with a
  pre-paint script so a saved theme never flashes
- Button, Switch and SegmentedControl with keyboard support, ARIA
  semantics and spring motion that respects reduced-motion
- Vitest + Testing Library tests, including a token-coverage test
- /tokens page documenting colour and motion tokens

Co-Authored-By: Claude Opus 5.5 <[email protected]>

tsconfig.json

@@ -0,0 +1,34 @@
+{
+  "compilerOptions": {
+    "target": "ES2017",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "react-jsx",
+    "incremental": true,
+    "plugins": [
+      {
+        "name": "next"
+      }
+    ],
+    "paths": {
+      "@/*": ["./src/*"]
+    }
+  },
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    ".next/dev/types/**/*.ts",
+    "**/*.mts"
+  ],
+  "exclude": ["node_modules"]
+}