docs: specify how a send shows progress, item 123

The spec said "disabled with a spinner" without saying where, which
leaves a popup as a reasonable reading of it. A popup is wrong here: it
would be modal over a window that is already disabled, and it can be
dismissed while the operation continues, which is the indicator
ambiguity items 18, 19, 28 and 54 each closed once.

Progress goes in the composer's own status bar, through the three
stages the operation actually has, since a failure filing the sent copy
means something different from a failure sending. The window closing is
the success message.

The indicator is an indeterminate QProgressBar built inline, matching
MainWindow's m_syncProgress rather than factoring out a shared widget:
this codebase builds small UI inline, and two progress bars do not
justify a third class.

Also settles what the staged display implies for a sent-copy write that
fails after a successful send: the composer still closes, because
holding it open for a message already sent invites sending it twice,
and the warning goes to the main window's status bar instead.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDq53rMd3AQp7QmcZzpuBM

0 files changed, 0 insertions, 0 deletions