implement update train details feature: add DTO, service method, and UI modal for editing train name and run numbers

apps/edr-freight-web/backoffice/src/services/trainBuilder.service.ts

@@ -140,6 +140,14 @@ export interface BuildTrainPayload {
   notes?: string;
 }
 
+/** Edit a built train's display identity; omitted fields keep their value. */
+export interface UpdateTrainDetailsPayload {
+  /** Empty string clears the name. */
+  trainName?: string;
+  importTrainNumber?: string;
+  exportTrainNumber?: string;
+}
+
 /** Built train annotated for the schedule-creation picker. */
 export interface AvailableTrain {
   id: string;
@@ -241,6 +249,9 @@ export const trainBuilderService = {
   build: (payload: BuildTrainPayload) => apiClient.post<TrainComposition>(BASE, payload),
   setLocomotives: (id: string, locomotiveIds: string[]) =>
     apiClient.put<TrainComposition>(`${BASE}/${id}/locomotives`, { locomotiveIds }),
+  /** Edit the train's name and fixed import/export run numbers. */
+  updateDetails: (id: string, payload: UpdateTrainDetailsPayload) =>
+    apiClient.patch<TrainComposition>(`${BASE}/${id}/details`, payload),
   /** Relocate the train — coupled locomotives and wagons move with it. */
   setYard: (id: string, currentYardId: string) =>
     apiClient.patch<TrainComposition>(`${BASE}/${id}/yard`, { currentYardId }),