### TL;DR
Redesigned the browser extension UI with a dark theme and improved the Twitter bookmarks import experience with a new onboarding flow.
### What changed?
- Added a new `RightArrow` icon component for UI navigation
- Completely redesigned the popup UI with a dark theme and improved layout
- Enhanced Twitter bookmarks import functionality:
- Added an onboarding toast that appears the first time a user visits the bookmarks page
- Implemented a persistent import intent system that automatically opens the import modal when navigating to the bookmarks page
- Created a progress toast to show import status
- Improved folder import UI
- Updated the extension icon and added a new logo SVG
- Improved the project selection modal with better styling
