Four recurrences of the same root cause in one app (each initially treated as a new bug): share sheet (fixed with `ActivitySharePresenter`), QuickLook preview (BUG-018, `AttachmentQuickLookPresenter`), camera capture — flash then parent-sheet dismissal (BUG-022, `CameraPresenter`; a prior incomplete fix, BUG-008, had only removed an imperative dismiss call and left the underlying declarative race), and the mail composer (`MailComposePresenter`).
