New features:
- Add 'Clear Annotations' link in footer with inline confirmation dialog
- Improve annotation validation with detailed console logging when text mismatches occur

Improvements:
- Move confirmation dialog to global scope for reusability
- Customize confirmation button text per action (Clear/Delete)
- Better debugging support for content-changed annotation issues

Technical:
- Update eslint configuration to include location global
- Style clear link to match footer aesthetics