fix: hamburger menu click handler and horizontal scroll issues

fix: hamburger menu click handler and horizontal scroll issues

- Improve hamburger menu JS with better error handling and console warnings
- Add preventDefault() to button click handlers for reliability
- Handle document ready state check (in case script runs before DOMContentLoaded)
- Add overflow-x-hidden to html and body to prevent horizontal scrolling on mobile
- Rebuild CSS: main.min.css updated

Co-Authored-By: Claude Haiku 4.5 <redacted>