Sidecar YAML rules

Key features

• Group folder → project folder → session row, both levels collapsible
• Rename / delete any groupevery group row (rule categories included) has a hover ⋯ menu
• Drag projects into groupsdrop on any group row or on a project row inside a group (cross-group move = overrides the rule classification)
• Tree-shaped searchresults keep the three-level structure (category → project → matched session), matched rows highlighted with a content snippet, 250ms debounce
• expansion state persists independently (dsh.workspace.groups.view.v1, survives refresh/restart)