feat(457 묶음 페이지): 노선 초안 follow 뒤 추가 측점 초안도 따라감 · 초안 버리면 초안 전 값(459 followPlusDraft 부름)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

A00_Common/design/design_pipeline_page.ts

@@ -56,7 +56,7 @@ import {
   readAlignmentDraft,
 } from "../../B05_Profile/B05_Profile_UI_Profile_Edit";
 import { readAlignment } from "../../B05_Profile/logic/B05_Profile_UI_Profile_Data";
-import { plusStationsOf } from "../../B05_Profile/B05_Profile_Api_PlusStations";
+import { followPlusDraft, plusStationsOf } from "../../B05_Profile/B05_Profile_Api_PlusStations";
 import { pageReplaying } from "../../B05_Profile/B05_Profile_UI_Profile_History";
 import {
   analysisTerrain,
@@ -450,6 +450,7 @@ function createPagePipeline(
     queueMicrotask(() => {
       if (event.generation !== pipe.generation) return;
       if (!pipe.input("route")) {
+        followPlusDraft(projectId, null); // 추가 측점도 초안 전 값으로(459)
         if (!beforeDraft) return;
         writeFacilities(beforeDraft);
         beforeDraft = null;
@@ -461,6 +462,7 @@ function createPagePipeline(
         pipes: (patch.pipes as Facilities["pipes"]) ?? now.pipes,
         structures: (patch.structures as Facilities["structures"]) ?? now.structures,
       });
+      followPlusDraft(projectId, patch.plusStations); // 추가 측점 = 좌표 따라감(459)
       const line = pipe.output("route")?.line ?? [];
       const far = Array.isArray(patch.structures)
         ? followStructures(