- Added `qrcode-tx-assistant.png` for transaction assistant functionality.
- Added `qrcode-tx-login.png` for user login process.
- Added `qrcode-tx-plans.png` for displaying available plans.
- Implemented Help Center page with video categories and tutorials.
- Added VideoModal component for video playback.
- Introduced progress tracking for watched videos using local storage.
- Created CSS styles for Help Center layout and components.
- Added video data structure and sample videos for various categories.
- Updated Footer to include a link to the Help Center.
horacio