Code Color Preview par lzhecz

Features
🎨 Automatic Color Detection. Detects and displays color previews for:
- Hex colors with # (e.g., #FF5733, #abc, #FF5733AA
- Hex colors without # (optional, e.g., FF5733
- RGB/RGBA colors (optional, e.g., rgb(255, 87, 51), rgba(255, 87, 51, 0.5)
🌐 Flexible Site Management:
- Whitelist approach: only runs on sites you explicitly enable
- Quick toggle button for current website in header
- Enable entire websites (domains) or specific pages (full URLs)
- Disable specific pages while keeping website enabled
- Temporary show mode (until page reload)