Fix codeblock function to handle caption display

[chuxinyuan]

OS: Linux x64 7.1.5-arch1-2
Typst: 0.15.1
Description: Omitting the caption of the code block will result in an error.

Summary by CodeRabbit

• Bug Fixes
  • Captionless code blocks now display directly without unnecessary figure wrappers, numbering, list entries, or citation references.
  • Code blocks with captions continue to support figure behavior and related references.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: fad2da1b-7676-4c83-a79e-74f4aadb84ee

📥 Commits

Reviewing files that changed from the base of the PR and between 41d60fa and 1ad18e0.

📒 Files selected for processing (1)

• lib/components.typ

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📝 Walkthrough

Walkthrough

codeblock now renders captionless code directly. Captioned code continues to use figures with numbering, code-list metadata, and citation support.

Changes

Code block rendering

Layer / File(s)	Summary
Conditional figure wrapping lib/components.typ	codeblock returns raw content when caption is none. Captioned code retains figure wrapping and code-list metadata.

Estimated code review effort: 2 (Simple) | ~5 minutes

Possibly related PRs

• pku-typst/pkuthss-typst#53: Both PRs modify lib/components.typ’s codeblock behavior for captionless and captioned code.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies a fix to codeblock caption handling, which matches the main change.
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 unit tests (beta)

• Create PR with unit tests

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