Workstreams header icon displays worktree branch icon instead of workstream icon

In the Nimbalyst top header where workstreams are displayed, the icon next to the workstream name appears to be a worktree/branch icon rather than the correct workstream icon.

Expected: Workstream-specific icon in the header
Actual: Worktree/branch icon is shown

This is a visual/UI bug in the workstream header display.