CkComposerFooterBuilder typedef
CkComposerFooterBuilder =
Widget Function(BuildContext context, TextEditingController controller)
Builds the composer's toolbar (e.g. a type dropdown, media pickers, an AI
writer button) — everything except the send button, which the sheet
places according to CkSendButtonPosition. controller is the sheet's
own composer text controller, so app-specific widgets (like an AI writer)
can read/write the same text.
Implementation
typedef CkComposerFooterBuilder =
Widget Function(BuildContext context, TextEditingController controller);