feat: support nth of, fix :enabled

[fb55]

• Support of in nth pseudo classes, e.g. :nth-last-child(1 of .a)
• Enabled should only apply to form elements

[Copilot]

Pull request overview

Adds Selectors Level 4 support for :nth-child(An+B of S) / :nth-last-child(An+B of S) and adjusts :enabled to only match relevant form controls.

Changes:

• Extend nth-family pseudo filter compilation to handle the optional of <selector-list> clause.
• Update :enabled alias to restrict matching to form-related elements and exclude :disabled.
• Add tests covering :enabled and :nth-child(... of ...) / :nth-last-child(... of ...).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
test/pseudo-classes.ts	Adds test coverage for :enabled and :nth-*(... of ...) behavior.
src/pseudo-selectors/index.ts	Passes compileToken through to filter compilers to enable nested selector compilation.
src/pseudo-selectors/filters.ts	Implements of-clause handling for nth-child / nth-last-child and refactors nth logic.
src/pseudo-selectors/aliases.ts	Fixes :enabled alias to only target form-control-like elements.

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