fix(mobile): a message that fails to send now says why in the thread (#15807)

Co-authored-by: T3 Code Test <t3code-test@example.com>
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
a1d9d72aefshivam committed on 10/5/2026, 3:33:40 AM· committed by GitHubparentde09c75
8 files changedLine totals unavailable