Stop text selection while dragging the expanded Mermaid viewer

[AdiRishi]

Requested by Adi · project thread

Before: dragging to pan the expanded Mermaid viewer highlighted the diagram's labels as a text selection.

After: dragging only pans; nothing gets selected.

How: the pan surface in PanZoom.tsx gets select-none (user-select: none), which the SVG text inherits. Checked in the dev server with Playwright: the same drag selected "Bob\nAlice\nBob" before the change and nothing after. pnpm check passes.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Y8zZi9uphvmprNJWq9UTWm

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Generated by Claude Code

Summary by CodeRabbit

• Style
  • Text can no longer be selected on the diagram pan-and-zoom surface.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 335b234e-5596-4394-9ee2-d700085b9365

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📥 Commits

Reviewing files that changed from the base of the PR and between 59ec622 and 91d8650.

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📒 Files selected for processing (1)

• src/features/markdown/render/diagram/PanZoom.tsx

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📝 Walkthrough

Walkthrough

The pan/zoom surface now applies select-none along with its existing cursor, touch, and grid classes.

Changes

Pan/Zoom Surface

Layer / File(s)	Summary
Pan/zoom surface classes src/features/markdown/render/diagram/PanZoom.tsx	The pan/zoom surface adds select-none to its CSS classes.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Bug fix

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Merge Risk: ⚪ Minimal · up to 91d86

The change supports panning without native text selection. No material regression requiring a fix was established.

Pre-merge checks | 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: preventing text selection while dragging the expanded Mermaid viewer.
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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