fix(B05 평면 측점 스냅): 끌기 · 방향키 하한 검사 = 맞추기 전 노선 — 10 m · 측점 No. 미리보기가 IP 를 밀어 헛걸리던 것 (390-5)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ji4nuyLVHcxrXWHTdb5nRD

B05_Profile/B05_Profile_UI_RouteEdit_Keys.ts

@@ -29,8 +29,8 @@ interface Hold {
   index: number;
   before: Vertex[];
   start: Vertex;
-  /** 키로 옮긴 자리(맞추기 전) — 다음 걸음은 여기서(맞춤이 쌓이지 않음). */
-  at: Vertex;
+  /** 스냅 미리보기 전 노선(맞추기 전) — 다음 걸음 · 하한 검사는 여기서(맞춤이 쌓이지 않음). */
+  raw: Vertex[] | null;
   moved: boolean;
 }
 
@@ -41,15 +41,25 @@ export function bindRouteEditKeys(params: RouteEditPointerParams, dragging: () =
 
   const metricAt = (x: number, y: number): Vertex => params.toMetric(...params.unrotate(x, y));
 
+  /** 스냅 미리보기 — 맞추기 전 노선을 쥔 뒤 맞춤(끔이면 쥐지 않음). */
+  function fitPreview(now: Hold, planned: Vertex[]): void {
+    const raw = planned.map((vertex): Vertex => [vertex[0], vertex[1]]);
+    now.raw = params.fitDrag(now.index) ? raw : null;
+  }
+
   /** 한 걸음 — 하한을 새로 깨면 그 걸음만 되돌림(끌기와 같은 검사). */
   function step(now: Hold): void {
     const state = params.state();
+    if (now.raw) {
+      now.raw.forEach((vertex, index) => (state.planned[index] = vertex));
+      params.markEdited();
+    }
     const node = state.planned[now.index];
     if (!node) return;
     const snapStepM = params.stations() !== null ? params.snapStepM() : undefined;
     const [dx, dy] = arrowStep(now.key, now.shift, metricAt, snapStepM);
     const before = curveShortfalls(state.nodeInfo, state.limitRadiusM, state.limitArcM);
-    state.planned[now.index] = [now.at[0] + dx, now.at[1] + dy];
+    state.planned[now.index] = [node[0] + dx, node[1] + dy];
     params.markEdited();
     const after = params.state();
     if (
@@ -57,6 +67,7 @@ export function bindRouteEditKeys(params: RouteEditPointerParams, dragging: () =
     ) {
       state.planned[now.index] = node;
       params.markEdited();
+      fitPreview(now, state.planned);
       status.textContent =
         `${params.routeHead()} — 하한에 걸려 더 못 옮깁니다` +
         `(곡선반지름 ${state.limitRadiusM}m${state.limitArcM > 0 ? ` · 곡선 길이 ${state.limitArcM}m` : ""}).`;
@@ -64,8 +75,7 @@ export function bindRouteEditKeys(params: RouteEditPointerParams, dragging: () =
       return;
     }
     now.moved = true;
-    now.at = state.planned[now.index];
-    params.fitDrag(now.index);
+    fitPreview(now, state.planned);
     status.textContent = `${params.routeHead()} — 방향키로 옮기는 중(뗄 때 한 걸음). ${params.curveHint()}`;
     params.draw();
   }
@@ -112,7 +122,7 @@ export function bindRouteEditKeys(params: RouteEditPointerParams, dragging: () =
       index,
       before: state.planned.map(([x, y]): Vertex => [x, y]),
       start: [node[0], node[1]],
-      at: [node[0], node[1]],
+      raw: null,
       moved: false,
     };
     hold = now;