[Feature] Group workspace folders by workspace in the Repository/Workspace dropdown on the home view

Summary

In the Repository/Workspace tile on the new home view, when multiple workspaces are added, the folder dropdown does not make it clear which folders belong to which workspace.

This makes the list harder to scan once more than one workspace is present.

Problem

When I add more than one workspace, I can see folders in the dropdown, but I cannot easily tell which folder comes from which workspace.

Requested Behavior

• Group folders in the dropdown by workspace so it is clearer which folders belong to which workspace
• Any reasonable UI treatment is fine:
  • grouped dropdown sections
  • subheaders
  • nested labels
  • or another lightweight pattern supported by the existing dropdown component

Why This Helps

• Improves clarity when multiple workspaces are configured
• Reduces confusion when selecting the correct folder
• Makes the Repository/Workspace tile scale better for multi-workspace use

Priority

Low priority

Notes

This may need design input, but if an existing dropdown utility already supports grouping/subgrouping, a simple implementation would be sufficient.

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This issue was created by an AI agent (OpenHands) on behalf of the user.