docs: record the message bar's next actions as item 189

From the user's notes: Star and Archive on the pane's own bar, and Mark all
read raised as a question. Two of the three fit the rule items 185 and 186
settled, that the bar carries what acts on the displayed message; mark_all_read
does not, since it deliberately ignores the selection and acts on every row in
the view.

Also records why Archive stays off the trash branch, which is narrower than it
looks: Delete already strips inbox, so Archive is a genuine no-op on mail this
application trashed. It is a real but pointless write on mail trashed by
another client, which never had its tags rewritten and can still carry inbox.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NY6poqw199LfFaXe5BHKNe

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