Minor fix on how highlights are displayed

Styling bugfix

- Improved script injection mechanics
- host_permission removed
- fixed injection bug on Firefox 119

- Added support for generic commit pages:
https://github.com/*/*/commit/*

- Added support for comparison pages:
https://github.com/*/*/compare/*
- note: only three-dot comparisons are supported due to GitHub API limitations

- Ported MergEase to safari

- Minor visual changes to the auto-activate switch

New Features:
- Implemented auto-activate option:
If turned on, there is no need to click the activate button on every page load.
- UX/UI improvement:
Replaced toggle buttons with a switch component for clarity
- MergEase now also works on the per-commit diff pages of the pull request

Bugfixes:
- Unicode character lengths
- Fail forward on hunk-level errors
- Highlighting problems due to GitHub changing class names
- Highlighting problems due to GitHub deferred highlighting
- Injection problems due to GitHub slow loading

Other:
- Performance improvements