🌈 Rainbow Bar v6.5.0

✨ New Features:
- Eye button (👁) on the bar to pin or auto-hide it
- Auto-hide mode: bar collapses to a colored 6px line, expands on hover
- Drag & drop bookmarks to reorder them — order saved permanently
- Right-click any bookmark: open in new tab, rename, or delete
- Bar now appears on new empty tabs

🐛 Bug Fixes:
- Fixed flickering/flashing in all visibility modes
- Fixed color picker spectrum disappearing while selecting colors
- Fixed text contrast issues across different websites
- Fixed bar offset cutting page content on multi-row layouts
- Performance improvements and faster loading