fix(app): snap to bottom on prompt

packages/app/src/components/prompt-input.tsx

@@ -65,6 +65,7 @@ interface PromptInputProps {
   ref?: (el: HTMLDivElement) => void
   newSessionWorktree?: string
   onNewSessionWorktreeReset?: () => void
+  onSubmit?: () => void
 }
 
 const EXAMPLES = [
@@ -1110,6 +1111,8 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
     }
     if (!session) return
 
+    props.onSubmit?.()
+
     const model = {
       modelID: currentModel.id,
       providerID: currentModel.provider.id,