feat(ast): increase SyntaxKindSet bitfield size to 6 elements for extended node support

[denbezrukov]

Summary

The CSS grammar had grown enough SCSS and at-rule support that it exceeded the fixed SyntaxKindSet capacity in biome_rowan. We have another option: #9436

Test Plan

cargo test -p biome_css_parser
cargo test -p biome_css_formatter

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4e4c3d4

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[codspeed-hq]

Merging this PR will not alter performance

✅ 58 untouched benchmarks
⏩ 156 skipped benchmarks¹

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_{Comparing db/extend (4e4c3d4) with main (795bad4)}

Footnotes

1. 156 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	53078	53078	0
Passed	51858	51858	0
Failed	1178	1178	0
Panics	42	42	0
Coverage	97.70%	97.70%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	38	38	0
Passed	37	37	0
Failed	1	1	0
Panics	0	0	0
Coverage	97.37%	97.37%	0.00%

markdown/commonmark

Test result	main count	This PR count	Difference
Total	652	652	0
Passed	652	652	0
Failed	0	0	0
Panics	0	0	0
Coverage	100.00%	100.00%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	5466	5466	0
Passed	1915	1915	0
Failed	3551	3551	0
Panics	0	0	0
Coverage	35.03%	35.03%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	636	636	0
Passed	568	568	0
Failed	68	68	0
Panics	0	0	0
Coverage	89.31%	89.31%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	18875	18875	0
Passed	13014	13014	0
Failed	5860	5860	0
Panics	1	1	0
Coverage	68.95%	68.95%	0.00%

[coderabbitai]

Walkthrough

The SyntaxKindSet struct in biome_rowan expands its internal bitfield storage from a 5-element u128 array to 6 elements. This increases the capacity of the syntax kind set to accommodate additional syntax kinds. The from_raw and union methods are updated accordingly to handle the expanded array dimension, with documentation examples adjusted to reflect the larger capacity.

Possibly related PRs

• chore(parser): increase size of SyntaxKindSet bitfield #7994: Modifies the same SyntaxKindSet struct to expand the u128 limb array capacity in the bitfield implementation.

Suggested labels

A-Core

Suggested reviewers

• ematipico

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: expanding SyntaxKindSet's bitfield from 5 to 6 elements for extended node support.
Description check	✅ Passed	The PR description clearly explains the reason for the change (CSS grammar growth exceeded capacity) and provides a test plan, directly relating to the bitfield expansion in the changeset.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch db/extend

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[denbezrukov]

If it doesn't alter performance, I prefer this change