feat: use shared Lightbox for md/tasks image previews

[peterchinman]

md/tasks render description images through the Lexical MarkdownImage decorator, whose "view full" action was a bespoke Kobalte Dialog showing a plain <img> with only a close button — no zoom/pan, download, or copy.

This replaces that custom viewer with the shared Lightbox component (@core/component/Lightbox) — the same one channels use via MediaViewerDialog. Task image previews now get the full toolbar (copy, download), zoom-to-cursor/pan, and consistent overlay styling, with no other behavior changes (still triggered by double-click / the enlarge button via the existing viewerOpen signal).

https://claude.ai/code/session_018RnRMdqUqYmoPU86w9ctvY

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Generated by Claude Code

[macro-application]

md/tasks should use same lightbox as channels

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between 4248d5a and dc56853.

📒 Files selected for processing (1)

• js/app/packages/core/component/LexicalMarkdown/component/decorator/MarkdownImage.tsx

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📝 Walkthrough

Summary by CodeRabbit

• Refactor
  • Simplified markdown image viewer implementation using the shared lightbox component.

Walkthrough

MarkdownImage.tsx refactors its full-image viewer to use the shared Lightbox component. The change adds a Lightbox import, adjusts related UI imports to remove close-button and icon dependencies, and replaces the custom Dialog.Content layout (with close button and inline <img>) in the Dialog.Portal with a Dialog.Overlay containing Lightbox configured with the image source and id.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title follows conventional commits format with 'feat:' prefix and is 53 characters, well under the 72-character limit. It clearly summarizes the main change: replacing a custom image viewer with a shared Lightbox component for markdown/tasks image previews.
Description check	✅ Passed	The PR description is directly related to the changeset, explaining the motivation for using the shared Lightbox component, what was replaced, and what new features are gained. It provides meaningful context about the change.
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.

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[github-actions]

Preview: https://peter-macro-1703-mdtasks-shoul-soujuy.preview.macro.com/app (99bdaab)