feat: support comments between concise mode line attributes

[DylanPiercey]

Fixes #203.

A comment line between comma-prefixed concise line attributes previously terminated the open tag, so the following line was misparsed as a new tag:

div
  ,foo=bar
  // comment
  ,bar=baz

The open tag now scans over // and /*...*/ comment lines between line attributes. The comments are skipped (not emitted), consistent with comments elsewhere in an open tag, and no longer end the tag. A trailing comment that isn't followed by another line attribute is still treated as content, preserving existing behavior.

Includes test fixtures and a changeset.

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Generated by Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 6a6e515

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

This PR includes changesets to release 1 package

Name	Type
htmljs-parser	Minor

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between aaeb3fd and 6a6e515.

⛔ Files ignored due to path filters (2)

• src/__tests__/fixtures/attr-comma-multiline-comment-trailing/__snapshots__/attr-comma-multiline-comment-trailing.expected.txt is excluded by !**/__snapshots__/** and included by **
• src/__tests__/fixtures/attr-comma-multiline-comments/__snapshots__/attr-comma-multiline-comments.expected.txt is excluded by !**/__snapshots__/** and included by **

📒 Files selected for processing (4)

• .changeset/quick-comments-attrs.md
• src/__tests__/fixtures/attr-comma-multiline-comment-trailing/input.marko
• src/__tests__/fixtures/attr-comma-multiline-comments/input.marko
• src/states/OPEN_TAG.ts

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Walkthrough

The parser’s concise-mode open-tag handling now scans past whitespace and line or block comments after a newline before checking for a comma. If no comma is found, it exits the open-tag state. The PR also adds fixtures covering multiline comma-separated attributes with inline, block, and trailing comments, plus a changeset entry noting the new support.

✨ Finishing Touches

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/htmljs-parser-203-ppn9y0

---

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.95%. Comparing base (aaeb3fd) to head (6a6e515).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #225   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files          34       34           
  Lines        4233     4261   +28     
  Branches      782      792   +10     
=======================================
+ Hits         4231     4259   +28     
  Misses          2        2           

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