A message with several attachments used to render every AttachmentRow
stacked vertically, pushing the message body arbitrarily far down. Now
only the first attachment shows by default; when there is more than one,
the extras collapse behind a "See x more attachments" control that
expands and collapses with an animated, rotating chevron. A single
attachment renders exactly as before (no accordion).
The count uses a plurals resource (quantity one/other) so it reads
"See 1 more attachment" / "See 2 more attachments" correctly. The toggle
is one clickable Role.Button whose label and chevron contentDescription
expose the expanded state to screen readers. Download/open behavior of
each row is unchanged.
Refs #134
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>