Add folder navigation and draft management#3
Summary
- Add sidebar navigation for account folders, smart folders, recents, and shared mail lists, with drag and drop organization and message moves.
- Sync watched folders and labels, and support creating, renaming, and deleting folders.
- Save drafts locally and to the server, with draft editing, sending, and undo support.
- Update the README and demo mailbox data for folders and drafts.
Testing
- Rust tests added for folder moves, demo folders, and draft save, open, send, and discard flows.
- ARM64 Windows release build completed; linker emitted a notice.