- email_detail: add Move-to-folder button (bottom-sheet mailbox picker, excludes current folder, calls moveEmail on server) - email_list: show amber star for flagged, paperclip for attachments in trailing area alongside date - PLAN.md: mark phase 8 done - README: add flag/move/attachment to working features Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>