feat: fold hierarchical tags with '/' in Versions tab

[spoorcc]

When any tag name contains a forward slash (as commonly seen in monorepo
setups, e.g. component/v1.0.0), the Versions tab now renders a collapsible
tree instead of a flat list. Tags are grouped by the prefix before the
first '/', and each group starts collapsed. Groups auto-expand when the
currently selected version lives inside them.

• Added CSS for .vtree-group-hdr, .vtree-item, .vtree-chevron, etc.
• Added _renderVerTree() to build the grouped HTML
• Added toggleTreeGroup() to expand/collapse a group
• Updated selectVersion() to use data-vidx attribute for highlight
  (works in both flat and tree modes)

Closes #31

Summary by CodeRabbit

• New Features
  • Hierarchical tree view for version tags with collapsible/expandable groups and chevrons.
  • Tags grouped by prefix for clearer navigation and counts per group.
  • Selection now targets rendered rows and will auto-expand a group when selecting an item inside it.
  • Improved rendering paths for grouped vs. flat tag lists to ensure consistent highlighting and updates.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0b244f06-7508-480e-bb1c-d8106351e153

📥 Commits

Reviewing files that changed from the base of the PR and between 3770167 and ae4aa54.

📒 Files selected for processing (1)

• dfetch_hub/site/index.html

---

📝 Walkthrough

Walkthrough

Adds hierarchical tag tree rendering to the versions list in index.html: detects tags with slashes, groups them by prefix, renders collapsible group headers and child rows, updates selection to use data-vidx, and auto-expands groups containing the selected version. (47 words)

Changes

Cohort / File(s)	Summary
Hierarchical Tag Tree UI dfetch_hub/site/index.html	Introduces hierarchical tag detection and two rendering paths (_renderVerTree, _renderVerFlat), new renderVersionRow(r,i) row builder, toggleTreeGroup(hdr) for collapse/expand, CSS classes for tree UI (vtree-*), and selection logic updated to use data-vidx and auto-reveal collapsed parents.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐇 I nibbled slashes, found a tree,
Branches folded snug for me,
Chevrons wink and rows align,
Data-vidx makes selection fine,
A little hop — versions shine 🌿

🚥 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 and concisely describes the main feature: enabling hierarchical tag folding in the Versions tab when tags contain forward slashes.
Linked Issues check	✅ Passed	All coding requirements from issue #31 are met: hierarchical tag detection, tree view rendering with grouping by '/' prefix, collapsed groups by default, and auto-expansion of selected versions' parent groups.
Out of Scope Changes check	✅ Passed	All changes are directly related to implementing hierarchical tag folding in the Versions tab as specified in issue #31; no unrelated modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/fix-selectversion-expand-groups-HqOhc

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@dfetch_hub/site/index.html`:
- Line 935: The clickable tree group header (tr with class "vtree-group-hdr"
that calls toggleTreeGroup(this)) is not keyboard accessible; update the element
creation to include tabindex="0", role="button", and an accessible state like
aria-expanded set from the open variable, and add a keydown handler (or attach
via the existing toggleTreeGroup) that triggers toggleTreeGroup(this) when Enter
or Space is pressed; ensure the same changes are applied to the other similar
headers around lines 951-957 so keyboard and assistive tech users can
expand/collapse groups.
- Around line 868-875: The long inline ternary/mapper for populating
document.getElementById('vtbody').innerHTML with allRefsCache should be split
into smaller helper functions: extract the row rendering logic into a function
(e.g., renderVersionRow(ref, index) that uses esc(ref.name), ref.kind,
ref.commit_sha, ref.date and calls selectVersion(index) on click), keep the tree
path using the existing _renderVerTree(allRefsCache) and delegate to a flat
renderer that maps allRefsCache.map(renderVersionRow). Ensure you reference
curVersion when computing sel and preserve hasHierTags, _renderVerTree,
allRefsCache, selectVersion, esc, and curVersion names so the final assignment
becomes a short conditional that calls the helpers and stays well under 120
characters per line.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6a4e0d07-8956-4a0d-a981-20190d9027be

📥 Commits

Reviewing files that changed from the base of the PR and between 1d446dd and 3770167.

📒 Files selected for processing (1)

• dfetch_hub/site/index.html