feat: add theme consistency guidelines and pin restrictions component

- Introduced DESIGN.md to outline rules for maintaining consistent light and dark themes, including color scales, symmetry rules, and contrast requirements.
- Added PinRestrictions component to display pin usage restrictions based on series data, ensuring accurate representation of pin functionalities.
- Implemented auditing script (auditar-temas.mjs) to check for theme consistency issues, including nonexistent tones, inverted pairs, low contrast, and inline fixed colors.

package.json

@@ -6,7 +6,8 @@
     "dev": "next dev --turbopack",
     "build": "next build --turbopack",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "auditar-temas": "node scripts/auditar-temas.mjs"
   },
   "dependencies": {
     "@emotion/react": "^11.14.0",