fix(github): support auto/system theme mode (#35)

* fix(github): support auto/system theme mode

Restructure selectors to properly match GitHub's auto theme mode by:
- Moving media queries outside parent selectors for correct specificity
- Adding explicit html element to attribute selectors
- Adding !important to accent-color variables to override GitHub defaults

Bump version to 1.1.1.

* fix(github): improve disabled button and tooltip styling

- Add tooltip colors matching rose-pine palette
- Make disabled buttons readable with solid backgrounds and muted text
- Use @muted for disabled foreground colors instead of faded/transparent

* chore: format all

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Co-authored-by: Julia Mertz <info@juliamertz.dev>

Author: jcyamo