Mirrors the web project-picker redesign (#95) in the TUI (#96): step one
lists one box per repository (name, full path); picking one reveals step
two — "+ new" then that repository's worktrees newest-first, defaulting
to "+ new" except on a box that is itself a linked worktree. "+ new"
creates (cwd is the repo, create-worktree on); an existing worktree runs
in it (cwd is that worktree, create-worktree off). Neither step probes
/api/gitroot — only the free-text "Other directory…" hatch does.
Replaces the flat indented project+worktree list from #91/#64 with
projects::group_projects-backed DraftGroup boxes; the filter still
matches a repository via its own name/path or any of its worktrees.
Miguel Palhas
cfc125144f