fix: reveal markdown directory links in the file tree, not Finder (#72)

[simion]

Closes #72.

Problem

A link in the markdown preview that resolves to a directory (e.g. [some-project](some-project/)) revealed the folder in Finder, jumping the reader out of the app mid-README, while sibling links to actual files open in a tab right there. GitHub instead renders a folder-listing page for the same link.

Fix

Redirect the is_dir branch in MarkdownPreview.onClick to revealInTree(taskId, resolved, true) instead of taskRevealPath. That store action already:

• un-hides the right panel and switches it to the All files view,
• expands the target directory's ancestors (and the dir itself, since isDir is supported),
• scrolls to and briefly highlights it.

It's the same reveal the editor breadcrumb's folder segments use (TaskView.tsx), so behavior is consistent app-wide.

resolved from resolveTaskHref is already task-root-relative and containment-checked (root-escaping paths return null), so it's exactly the path space the tree keys on. Member files resolve to <member_dir>/rest, which is just a subfolder in the wrapper tree, so multi-repo works with no special casing.

Binary files (images, archives) that the editor can't render still reveal in the OS file manager, unchanged.

Test plan

• Open a README whose links point to a subfolder (trailing slash) in the markdown preview.
• Click a directory link, confirm the sidebar file tree focuses/expands the folder in-app instead of opening Finder.
• Click a file link, confirm it still opens in an editor tab.
• Click an image/archive link, confirm it still reveals in Finder.

tsc -b clean. No CHANGELOG entry (maintainer-authored at release time).

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https://claude.ai/code/session_019x3kbDKdUAfbCKeWhBnmJw