docs(backlog): record items 160 and 161 from the notes

Both are composer feedback, and both causes are verified in the code
rather than copied from the note.

160: autosave works and is silent on success. The only feedback is the
failure banner, whose comment explicitly rejected the fading status line
that success actually wants. m_dirty and the draftSaved signal already
carry both states; nothing displays them.

161: the composer has no menu bar, and Save draft does not exist as an
action at all. saveDraftNow() is reachable only from the timer, Send and
closeEvent, so there is no way for the user to ask for a save. Notes that
the composer's actions stay out of KeyMap per item 148, that
everyActionIsReachableFromAMenu() walks the main window only, and that
"duplicate the other actions" needs the user to say which, since most
message actions are meaningless over a message being written.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UUQS6n3cmsFrsjCNmwNtf8

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