Poll for the compose FAB via waitForText instead of a one-shot assert: under refresh==Loading the LazyPagingItems presenter settles non-deterministically, and the FAB flaked as both not-displayed and not-found across CI runs. Keeps the stable mailbox_empty assertDoesNotExist gate check (#219). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>