[bartveneman]

Summary

This PR adds support for parsing the selector arguments in @scope at-rules into proper SelectorList child nodes, enabling tooling to access the parsed selector structure rather than just the raw text.

Key Changes

• PreludeSelectorList type enhancement: Changed from a simple Leaf type to a node that can contain a SelectorList child, allowing access to parsed selector structure
• Selector parsing in @scope prelude: Integrated SelectorParser into AtRulePreludeParser to deep-parse the parenthesized selector arguments of @scope rules
• Line/column tracking: Implemented accurate line and column offset calculation for selectors within parentheses, accounting for whitespace trimming and newlines
• Node type registration: Added PRELUDE_SELECTORLIST to the set of node types that can have children
• Comprehensive test coverage: Added 13 new test cases covering selector parsing, line/column tracking, edge cases (empty parens, invalid selectors), and tree walking

Implementation Details

• The selector parser is invoked after trimming whitespace from the parenthesized content, with adjusted line/column positions to account for the trimmed prefix
• Empty parentheses result in a PreludeSelectorList with no children and a null value
• Invalid selector content is handled gracefully without throwing, preserving the trimmed value for error recovery
• The walk() function correctly traverses into selector nodes within @scope prelude arguments
• Clone operations preserve the selector child structure

https://claude.ai/code/session_017DgMj6vDYAFcmet3GUS5n8

[github-actions]

⚠️ Package Size Increase

📦 Package	📏 Base Size	📏 Source Size	📈 Size Change
@projectwallace/css-parser	43.8 kB	43.9 kB	+169 B

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commit: 22acfdc