Always show the "Current worktree" toolbar segment, even with only one worktree

The feature request

The toolbar's "Current worktree" segment only appears once a repo has multiple work trees. When often switching between having a single worktree and having multiple - the relative position of "Current branch" and "Publish branch" / "Fetch origin" move positions frequent. Quickly looking at the first section for the branch by muscle memory can confuse the worktree name with the branch name if working quickly.

Proposed solution

Add an option to always show the "Current worktree", rather than show/hide it based on worktree count.

Additional context

Workaround is to create a dummy worktree that is always present, just to keep the current worktree section shown.