fix: draw Important as a star on the message bar

The action carried mail-mark-important, which Breeze and several other themes
draw as an exclamation mark rather than a star. The filter button for the same
tag has used `starred` since a15505d, where the comment records the user asking
for a star when item 57 renamed the action, and the two were allowed to differ
on the reasoning that a query-row icon reads as a category while an action icon
reads as a verb.

That reasoning held only while the action appeared beside its own label. Item
189 put it on the icon-only message bar, where the icon IS the control, and it
read as an info glyph. Both are `starred` now.

The label stays "Important" and the tag stays `flagged`; only the picture
changes. `starred` sits under status/ rather than actions/ in the icon spec,
which needs no fallback: an unresolved name already leaves the action with text
alone, and it resolves in the user's own theme, verified.

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

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