60b6ea237f
Sessions with no cwd — or whose folder can't be promoted to a project (the bare home dir, a deleted workspace, HERMES state) — were dropped from the project tree entirely, so the grouped sidebar silently showed fewer chats than flat Recents. Collect them into a synthetic `__no_project__` node at the head of the list. It carries one lane purely to hold the rows, and is omitted when empty so a project-less install stays blank.