enhancement(cases):Add "Show All Descendants" View for Repository Folders

[therealbrad]

Description

Adds a "Show all descendants" toggle to the test case repository folder view. When a folder is selected and the toggle is enabled, the test case list displays cases from the selected folder and all nested subfolders in a single, unified list. Each case row shows a folder badge indicating which subfolder it belongs to, with a tooltip displaying the full folder path.

Key implementation details:

• Toggle UI: An outline toggle button with a FolderDown icon, placed on the breadcrumb row (right-justified). Uses bg-primary/text-primary-foreground styling when active.
• Descendant computation: BFS traversal of the already-in-memory folder hierarchy to collect all descendant folder IDs — no additional API calls needed.
• Query modification: Changes the where clause from { folderId: { equals: id } } to { folderId: { in: [...descendantIds] } } when the toggle is active.
• Folder path display: Builds a Map<folderId, path> from the folder hierarchy for tooltip display (e.g., "Parent › Child › Grandchild").
• All existing sorting, filtering, search, pagination, and bulk actions work on the aggregated list.

Related Issue

Closes #167

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement

How Has This Been Tested?

Describe the tests you ran to verify your changes:

• Unit tests
• Integration tests
• E2E tests
• Manual testing

Test Configuration:

• OS: macOS
• Browser (if applicable): Chrome
• Node version: 22.x

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published
• I have signed the CLA

Additional Notes

• The toggle state is held in React state — it persists while the user stays on the page but resets on navigation. This could be enhanced with URL parameter or user preference persistence in a follow-up.
• No schema or API changes were needed. The feature leverages the existing folder hierarchy data already loaded by the TreeView component.
• The folder path tooltip in the NameCell previously relied on a disabled useFindManyRepositoryFolders query. This PR provides paths via a folderPathMap computed from the parent's folder hierarchy, avoiding any additional queries.

[therealbrad]

🎉 This PR is included in version 0.20.2 🎉

The release is available on GitHub release

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