feat: responsive system, engineering infra, new components, performance

- Section: responsive prop with media query injection
- visual-weights: fontSize clamp() for responsive sizing
- variables.css: add border-radius/shadow/transition/z-index tokens
- ESLint flat config + Prettier + Changeset init
- New components: Footer, NewsSidebar, BreakingNewsBanner
- Image/Figure: loading=lazy, aspectRatio, sizes props

package.json

@@ -2,17 +2,25 @@
   "name": "newspaperui",
   "version": "0.0.0",
   "private": true,
+  "type": "module",
   "description": "A newspaper-style UI component library",
   "scripts": {
     "build": "turbo run build",
     "dev": "turbo run dev",
-    "lint": "turbo run lint",
+    "lint": "eslint packages/*/src/",
     "test": "turbo run test",
     "clean": "turbo run clean && rm -rf node_modules"
   },
   "devDependencies": {
+    "@changesets/cli": "^2.31.0",
+    "@eslint/js": "^10.0.1",
+    "eslint": "^10.4.0",
+    "eslint-plugin-react": "^7.37.5",
+    "eslint-plugin-react-hooks": "^7.1.1",
+    "prettier": "^3.8.3",
     "turbo": "^2.3.3",
-    "typescript": "^5.7.2"
+    "typescript": "^5.7.2",
+    "typescript-eslint": "^8.59.4"
   },
   "packageManager": "pnpm@9.15.4",
   "engines": {