dash: show branch / repo / worktree per session #1200

Reported from dogfooding min dash.

Show the git branch / repo / worktree for each session in the dash view.

From dash feedback (Slack): https://minimal-dev.slack.com/archives/C091HGA43NC/p1786406103071889?thread_ts=1786387349.174509&cid=C091HGA43NC