🚀 UI/UX & Interactive Tooltips

• New Interactive Tooltips: Added descriptive tooltips next to key settings to provide instant help and clarification on specific features.
• Enhanced Visual Hierarchy: Grouped related items together for a cleaner, more modern look, ensuring a consistent visual experience.

🛠️ Small UI Improvements
+ Dynamic Release Links: The version number in the header is now a live link that takes you directly to the latest changelog on GitHub.
+ Updated Footer: Support links (Star, Rate, Feedback) have been redesigned into modern chip buttons.
+ Moved the "Last Sync" info directly under the "Sync Now" button.

🚀 New Features
+ Multi-Source Sync: You can now sync multiple collections or tags at once by separating them with commas (e.g., Work, Shopping, Tech Tips).
+ Live API Validation: The extension now verifies your API token in real-time and displays your Raindrop profile name upon successful connection.
+ Improved Sync Intervals: Flexible auto-sync options added for 2, 6, and 12 hours, alongside the existing Daily and Weekly schedules.
+ Flatten Structure Option: A new toggle to merge all imported bookmarks into a single flat folder, bypassing nested subfolder creation.

🛠️ Improvements & Bug Fixes
- Fixed an issue where tags containing spaces (like "Tech Tips") failed to import.
- Implemented API rate limiting to ensure stable syncing even with large collections.
- Improved error handling for more descriptive feedback when something goes wrong.
- Fixed a bug where the settings panel required multiple clicks to close on first launch.
- Removed annoying horizontal scrollbar that appeared when expanding menus.