fix: codeblock header border-radius

[4anghyeon]

Summary

The codeblock header is missing rounded-t-md, causing a visual inconsistency
between the container's border-radius and the header background.

Screenshots

Before	After

Changes

• Add rounded-t-md to the header element in CodeBlockView.tsx

Issue: #827

Summary by CodeRabbit

• Style
  • Added rounded top corners to code block headers for improved visual presentation and consistency.

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👷 Deploy request for tanstack pending review.

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Name	Link
🔨 Latest commit	e04f68b

[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: 91ffd917-c808-4f1b-ae6e-d3578fd3fe5e

📥 Commits

Reviewing files that changed from the base of the PR and between 004be5c and e04f68b.

📒 Files selected for processing (1)

• src/components/markdown/CodeBlockView.tsx

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📝 Walkthrough

Walkthrough

The CodeBlockView component receives a styling enhancement with the addition of the rounded-t-md CSS class to the header container that renders conditionally when title or showTypeCopyButton is present.

Changes

Cohort / File(s)	Summary
UI Styling Enhancement src/components/markdown/CodeBlockView.tsx	Added rounded-t-md class to conditional header container for top-rounded border styling.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A whisker-twitch of rounded grace,
The header bows with softer face,
No corners sharp, just curves so sweet,
This styling fix makes code complete!

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding rounded-t-md class to fix the codeblock header border-radius visual inconsistency.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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