improvement: the last flow improved a little.

frontend/src/components/ui/treatment/TreatmentWorkspace.tsx

@@ -2438,7 +2438,14 @@ export function TreatmentWorkspace({
             saveStatus={saveStatus}
             uploadBusy={uploadBusyDetailId === activeDetailId}
             onAddDetail={() => {
-              const next = newDetail();
+              const seedFromAppointment =
+                details.length === 0 && selectedAppointment
+                  ? defaultTreatmentTypeForAppointment(
+                      selectedAppointment.purpose,
+                      treatmentCatalog,
+                    )
+                  : undefined;
+              const next = newDetail(seedFromAppointment);
               setDetails((prev) => [...prev, next]);
               setActiveDetailId(next.clientId);
               setEntryStep('treatment');