Fix wrapped code line spacing

[tannerlinsley]

What changed

• render wrapped code lines as inline blocks instead of block boxes
• keep each line at least as wide as its code block while allowing long lines to expand
• add regression coverage for the base-style contract

Root cause

The renderer intentionally preserves newline text nodes between line wrappers. Styling those wrappers as blocks created an additional visual row for every preserved newline.

Validation

• pnpm run verify

Summary by CodeRabbit

• Bug Fixes

  • Improved wrapped-line layout while preserving intentional line breaks.
  • Updated generated styling so lines size correctly within their available width.

• Tests

  • Added coverage to verify the updated line-layout behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 01e324c8-415f-4a9f-8929-f77ec4945c74

📥 Commits

Reviewing files that changed from the base of the PR and between 169d620 and e3557fb.

📒 Files selected for processing (2)

• src/theme.ts
• test/themes.test.ts

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📝 Walkthrough

Walkthrough

The base theme CSS now lays out .th-line elements as inline blocks with width: max-content and min-width: 100%. A test verifies the generated rule.

Changes

Wrapped line styling

Layer / File(s)	Summary
Base CSS and validation src/theme.ts, test/themes.test.ts	The .th-line rule changes from block sizing to inline-block layout with full-width minimum sizing, and the generated CSS is covered by a new test.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main change.
Description check	✅ Passed	The description covers the change, root cause, and validation, but it should use the template's Changes heading and add fixture/benchmark details.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch taren/fix-code-line-spacing

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