Replace the static ⏳ hourglass on an in-flight direct message with the
reusable tui.Spinner, animated for the whole wait-for-ack window:
- _delivery_glyph is now a method returning the spinner's current frame when
acked is None (✅/❌ once resolved); the _SENDING constant is gone.
- _spin_while wraps the awaited send and retry, running a background ticker
that advances the shared spinner and repaints, then cancels-and-awaits it
(same no-stray-task discipline as the startup splash). Only one send or
retry is ever in flight (both gated by _sending), so one spinner suffices.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 4.8
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