api: PUT /assignments/:id/transport gains direction (outgoing|incoming)

server/src/nest/assignments/assignments.controller.ts

@@ -175,7 +175,9 @@ export class AssignmentOpsController {
     if (!this.assignments.getAssignmentForTrip(id, tripId)) {
       throw new HttpException({ error: 'Assignment not found' }, 404);
     }
-    const assignment = this.assignments.setLegTransportMode(id, body.transport_mode ?? null);
+    const assignment = body.direction === 'incoming'
+      ? this.assignments.setIncomingLegTransportMode(id, body.transport_mode ?? null)
+      : this.assignments.setLegTransportMode(id, body.transport_mode ?? null);
     this.assignments.broadcast(tripId, 'assignment:updated', { assignment }, socketId);
     return { assignment };
   }

server/src/nest/assignments/assignments.service.ts

@@ -272,6 +272,17 @@ export class AssignmentsService {
     return this.getAssignmentWithPlace(Number(id));
   }
 
+  /**
+   * Set the travel mode of the leg arriving at this stop (#1281 boundary legs).
+   * Mirrors setLegTransportMode but targets incoming_leg_transport_mode; inert
+   * when the previous timeline element is a place (the column is only read for
+   * non-place origins like a booking arrival or a morning hotel departure).
+   */
+  setIncomingLegTransportMode(id: string | number, mode: string | null) {
+    this.dbs.run('UPDATE day_assignments SET incoming_leg_transport_mode = ? WHERE id = ?', mode ?? null, id);
+    return this.getAssignmentWithPlace(Number(id));
+  }
+
   setParticipants(assignmentId: string | number, userIds: number[]) {
     this.dbs.transaction(() => {
       this.dbs.run('DELETE FROM assignment_participants WHERE assignment_id = ?', assignmentId);