Add visible shadow to workspace comments

[lawsie]

Summary

Make the highlight outline when a workspace comment is focused actually visible in all themes.

AI usage

Claude Sonnet 5 worked out why the outline was displaying as a very thin line and suggested adding the drop shadow to combat the problem of contrast against something light and something dark simultaneously.

Summary by CodeRabbit

• Style
  • Added a purple highlight with a white outline for selected comments.
  • Applied the highlight consistently to both expanded and collapsed comments.

[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: d0250704-5d9e-43bc-921f-8f87647d3e7c

📥 Commits

Reviewing files that changed from the base of the PR and between 823f1af and 98ef022.

📒 Files selected for processing (1)

• style/blockly.css

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📝 Walkthrough

Walkthrough

The stylesheet adds selected-comment highlights for expanded and collapsed comments. The highlights use a purple non-scaling stroke and white drop-shadow outlines.

Changes

Selected comment styling

Layer / File(s)	Summary
Comment highlight styles style/blockly.css	Adds purple non-scaling strokes and white drop-shadow outlines for selected comments and collapsed selected comment topbars.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: tracygardner

🚥 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 describes the main change: adding a visible shadow to workspace comments.
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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