Show Rich Workspace (folder README/description) in the Folder Tree view

Is your feature request related to a problem? Please describe.

When the Folder Tree view is used (/apps/files/files/folders/..., "Ordnerbaum"), the Rich Workspace / folder description (the rendered Readme.md) is not displayed above the file list. The same folder shows the workspace correctly in the classic "All files" view.

Users who navigate primarily via the folder tree lose the folder description entirely, and there is no setting to re-enable it there ("Show folder description" is already on).

Describe the solution you'd like

Render the Rich Workspace header in the Folder Tree view (folders) just as it is rendered in the files/personal/favorites file-list views, respecting the existing "Show folder description" user setting.

Describe alternatives you've considered

• Using the classic "All files" view instead (works, but defeats the purpose for users who prefer the folder tree).
• A per-view toggle, if always-on is not desired.

Additional context

• Nextcloud Server 32.0.11
• Reproduced on a hosted instance; workspace file is a normal README.md (text/markdown) at the folder root.
• Possibly related (different view, older): #43402 — folder description not shown when navigating from Favorites (NC 28).

Start at the Folder Tree view entry point, /apps/files/files/folders/..., and compare how the Rich Workspace header is rendered in the files, personal, and favorites views. Done means the Folder Tree view displays the rendered root README.md description when the existing "Show folder description" setting is enabled.