Feat: introduce follow up actions

src/app/staging.rs

@@ -85,6 +85,7 @@ impl App {
             pat.speed = props.speed;
             pat.quantization = props.quantization;
             pat.sync_mode = props.sync_mode;
+            pat.follow_up = props.follow_up;
             self.project_state.mark_dirty(bank, pattern);
         }