Fixes incorrect folder highlighting in webview file trees

[d13]

Problem

Selecting a folder in the webview file tree incorrectly highlights other folders with the same name, causing confusion in navigation and selection.

Solution

• Updates folder selection logic to use each folder's relative path for highlighting, ensuring only the intended folder is visually selected.
• Prevents ambiguity when multiple folders share the same name but reside at different locations in the tree.

Benefit

Improves user experience and accuracy when working with nested folders in file trees within webview panels.

Fixes #4801

[augmentcode]

🤖 Augment PR Summary

Summary: Fixes incorrect folder highlighting in webview file trees by using each folder’s relative path as the node identifier.
Changes: Updates commit details and patch details tree model generation (plus changelog) so folder TreeModel.path uses relativePath, avoiding collisions for same-named folders.

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[augmentcode]

Review completed. 1 suggestions posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

relativePath from makeHierarchical is built using (...parts) => parts.join('/'), which results in top-level folder paths like /foo because the seed starts as an empty string. If any consumers expect folder path values to match file.path formatting (foo/bar without a leading slash), this could cause selection/lookups to behave unexpectedly.

Other Locations

• src/webviews/apps/plus/patchDetails/components/gl-tree-base.ts:135

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[sergeibbb]

@d13
Looks good to me