A deleted personal folder is kept in trashed_folders with its subfolders; its notes are trashed and tied to it. The trash lists the folder as one entry with its note count; restoring brings back the folder tree (empty subfolders too) and all notes, deleting for good, emptying the trash and the notes trash delay remove it with its notes. Folders in shared folders keep the old way. Deleting a folder now asks first, in a small popover at the click (ConfirmPopover, documented in ui-patterns). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>