Show folder name and git branch for nested worktree Spaces rows

[lakshyads05]

Problem

Root Spaces rows show both identity and branch:

tatbiq
  main

Nested / linked worktree children only show one line, and that line is the branch, not the checkout folder:

  develop
  feature/TD-129-prompt-...
  release/v/1.7.2

That breaks when the worktree folder and the checked-out branch diverge (rename, git switch, shared folder naming). The folder is what you open on disk; the branch is what git is on. Both matter in a multi-worktree sidebar.

Current behavior (0.7.3)

For indented worktree children, Herdr:

1. Replaces the workspace display label with the branch via grouped_child_display_label (unless the space has a custom name)
2. Sets suppress_git_details: true, which drops the built-in branch / git_status tokens from [ui.sidebar.spaces].rows

So even with the default layout:

[ui.sidebar.spaces]
rows = [
  ["state_icon", "workspace"],
  ["branch", "git_status"],
]

children never get the two-line folder + branch treatment that parents get. Renaming the space only swaps which single string is shown; it does not restore both.

Desired behavior

For linked worktree children, show both:

• checkout / folder identity (cwd-derived or relative path under the repo root)
• live git branch (and optionally git_status)

Example when they differ:

  feature/TD-129-prompt-productivity-prompt-queue
    bugfix/TD-235-rtl-layout

When they match, today's single-line density is fine (or show once and omit the duplicate).

Why

Bare-repo / sibling worktree layouts often use folder names that look like branches, but the checkout can move. Collapsing child rows to branch-only hides the path you actually attached the space to.

Possible approaches

Any of these would unblock the use case:

1. Stop setting suppress_git_details for indented children (or gate it behind config, defaulting to current behavior)
2. Keep branch as a secondary token, but use the folder/cwd-derived label for workspace instead of substituting the branch in grouped_child_display_label
3. Add a built-in Space token such as path / checkout for the relative checkout path, and document a child-friendly rows layout

Happy to adjust to whatever fits the sidebar token model best.

Environment

• herdr 0.7.3 (Homebrew)
• macOS
• Multiple linked worktrees grouped under one repo Space