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fix: comma-separated declaration values parsed as Raw nodes (#101)

* Initial plan

* Fix comma-separated declaration values parsed as Raw nodes

- Import Comma and LeftCurlyBracket tokens in DeclarationList.js
- Fix isElementSelectorStart() to properly handle comma-separated values
- Use positive check for LeftCurlyBracket instead of negative exclusion
- Ensure pseudo-class detection only returns true when followed by {
- Add test cases for comma-separated declaration values

Fixes regression introduced in v3.6.7 where properties like background-attachment,
font-family, and transition with comma-separated values were incorrectly parsed
as Raw nodes instead of Declaration nodes.

Co-authored-by: nzakas <38546+nzakas@users.noreply.github.com>

* Improve code clarity in isElementSelectorStart function

- Restructure control flow for better readability
- Handle colon case explicitly with clearer logic
- Add more descriptive comments
- Separate declaration and selector detection paths

Co-authored-by: nzakas <38546+nzakas@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: nzakas <38546+nzakas@users.noreply.github.com>

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