perf(format/html): replace string comparisons with token set checks

[dyc3]

Summary

The main purpose of this PR was to refactor the HTML formatter to get rid of most string comparisons and related possible memory allocations. However, it turned out there were some bugs, and I just went ahead and fixed those because it made the code more simple.

On my machine, I got a ~1-3% perf improvement

implemented by gpt 5.6 sol

Test Plan

snapshots

Docs

[changeset-bot]

🦋 Changeset detected

Latest commit: 2235b73

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@biomejs/biome	Patch
@biomejs/cli-win32-x64	Patch
@biomejs/cli-win32-arm64	Patch
@biomejs/cli-darwin-x64	Patch
@biomejs/cli-darwin-arm64	Patch
@biomejs/cli-linux-x64	Patch
@biomejs/cli-linux-arm64	Patch
@biomejs/cli-linux-x64-musl	Patch
@biomejs/cli-linux-arm64-musl	Patch
@biomejs/wasm-web	Patch
@biomejs/wasm-bundler	Patch
@biomejs/wasm-nodejs	Patch
@biomejs/backend-jsonrpc	Patch

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[github-actions]

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[codspeed-hq]

Merging this PR will degrade performance by 6.45%

❌ 3 (👁 3) regressed benchmarks
✅ 64 untouched benchmarks
⏩ 234 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
👁	html_analyzer[real/wikipedia-fr-Guerre_de_Canudos.html]	1.1 s	1.2 s	-6.55%
👁	html_analyzer[real/wikipedia-Unix.html]	440.7 ms	471.4 ms	-6.52%
👁	html_analyzer[real/wikipedia-JavaScript.html]	535 ms	570.8 ms	-6.29%

---

_{Comparing dyc3/refactor-html-fmt-token-sets (2235b73) with main (b63987a)}

Footnotes

1. 234 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. ↩