Remove max-height restriction from mermaid preview container

[001-mak]

This PR fixes issue #14874

Summary by CodeRabbit

Release Notes

• Bug Fixes
  • Removed height limitation on Mermaid diagram previews in code blocks, allowing larger diagrams to render at their full size without being constrained by a fixed maximum height.

[coderabbitai]

📝 Walkthrough

Walkthrough

Removed the max-height: 600px styling constraint from the Mermaid preview container. The rendered SVG area can now expand beyond 600px vertically when needed, with min-height: 300px as the only height restriction.

Changes

Cohort / File(s)	Summary
Mermaid Preview Styling packages/frontend/core/src/blocksuite/view-extensions/code-block-preview/mermaid-preview.ts	Removed max-height: 600px constraint from preview container, allowing SVG rendering area to grow dynamically beyond previous limit.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
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.
Title check	✅ Passed	The title clearly and accurately describes the main change—removing the max-height restriction from the mermaid preview container styling.

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[001-mak]

@darkskygit please review and merge