fix(E04): 2D 최소 = GET …/stab/result2d · 구간 바뀌면 늘 저장본 다시 엶 (533-3)

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

E04_Stab3D/E04_Stab3D_UI_Page.ts

@@ -3,7 +3,7 @@
  * E04 안정성평가 3D 해석(요구 347-1 · 요구서 4-2 · 4-3 · PLAN 533-3) — B05~B09 틀(group_workflow).
  *   좌 = 구간 목록 · 탐색 설정(기본 · 고급 접힘) · [해석] · 진행률 · [끊기]
  *   가운데 = 평면 지도(셀별 최소 안전율 · 임계 체적) · [3D 보기](지표 + 노선면 + 임계 활동면)
- *   우 = 구간 결과(3D 최소 · 2D 최소(같은 구간) · 3D/2D 비 · 체적 · 방법)
+ *   우 = 구간 결과(3D 최소 · 2D 최소(같은 구간 E03 측점 fs_min 최소) · 3D/2D 비 · 체적 · 방법)
  *   계산 = 서버 단독(POST …/stab/analyze3d · 뒤에서) · 화면은 값 · 그림만. 탐색 설정 = sessionStorage.
  * ========================================================================== */
 
@@ -74,13 +74,13 @@ async function api<T>(path: string, init?: RequestInit): Promise<T> {
   return body;
 }
 
-/** E03 2D 측점 결과(sub2 · GET …/stab/section) — 없으면 빈 목록 */
+/** E03 2D 측점 요약(GET …/stab/result2d · stations[].fs_min · 측점 하나에 깎기 · 쌓기 두 줄) — 없으면 빈 목록 */
 async function fetch2d(
   projectId: string,
 ): Promise<{ chainage_m: number; fs_min: number | null }[]> {
   try {
     const body = await api<{ stations?: Record<string, unknown>[] }>(
-      `/projects/${projectId}/stab/section`,
+      `/projects/${projectId}/stab/result2d`,
     );
     return (body.stations ?? []).map((s) => ({
       chainage_m: Number(s.chainage_m),
@@ -233,12 +233,13 @@ export function renderE04Stab3D(root: HTMLElement): void {
 
   const remember = (): void =>
     sessionStorage.setItem(cacheKey(projectId), JSON.stringify(settings.read()));
+  let shownKey = "";
   settings.onChange(() => {
     remember();
     const { start_m, end_m } = settings.read();
     map.setRange(start_m, end_m);
     paintSections();
-    if (result && result.key !== sectionKey(start_m, end_m)) void openResult();
+    if (shownKey !== sectionKey(start_m, end_m)) void openResult();
   });
 
   function paintButtons(): void {
@@ -285,13 +286,12 @@ export function renderE04Stab3D(root: HTMLElement): void {
   }
 
   function paintResult(): void {
-    const { start_m, end_m } = settings.read();
     if (!result) {
       resultBody.replaceChildren(el("p", { className: "e04-empty", text: t("E04_Result_None") }));
       return;
     }
     const s = result.summary;
-    const f2d = min2d(stations2d, start_m, end_m);
+    const f2d = min2d(stations2d, s.start_m, s.end_m);
     const ratio = ratio3d2d(s.f_min, f2d);
     const station = overview?.stations.reduce<StationPoint | null>(
       (best, x) =>
@@ -331,6 +331,7 @@ export function renderE04Stab3D(root: HTMLElement): void {
   async function openResult(): Promise<void> {
     const { start_m, end_m } = settings.read();
     const key = sectionKey(start_m, end_m);
+    shownKey = key;
     const saved = overview?.saved.some((s) => s.key === key);
     result = saved
       ? await api<Result3d>(`/projects/${projectId}/stab/result3d?key=${key}`).catch(() => null)