Match CSS attribute selector values before retaining attributes

[Neallin-917]

Fixes #2145

includesAttrSelector now evaluates CSS attribute selector operators against the current attribute value. The callers in inlineStyles and removeUnknownsAndDefaults now provide that value, so selectors that cannot match no longer keep a redundant attribute.

Added unit coverage for supported operators and regressions for both affected plugins.

Validation:

• full Jest suite: 494 passed, 3 skipped
• ESLint and Prettier
• type checks, tsd, and bundle build
• bundled-browser test

AI assistance: this patch was AI-assisted and the listed validations were run locally.

[Neallin-917]

Friendly follow-up: this is a focused fix for CSS attribute-selector values being matched before attributes are retained, with a regression fixture covering quoted and escaped values. It was validated with the project's QA suite. I would appreciate a maintainer review when convenient, and I am happy to adjust the approach if needed. Thank you.

[Neallin-917]

I rebased this focused change onto current main after confirming the earlier CI failure came from the prior base’s regression-test dependency state, outside this PR’s diff. Local pnpm run qa now passes (523 tests passed, 3 skipped). The new GitHub Actions runs are currently marked action_required before any jobs start; could a maintainer approve them when convenient? Thank you.