feat(abut): 교대 형상·입력 패널과 교각 받침·솔플레이트 개편

- 교대 형상(src/core/abut, 3D 장면, 목록·카메라·맞춤)과 교대 입력 패널 추가
- 교각 받침 기준 카드 제거, 솔플레이트 규칙을 교각별 입력으로 변경
- 받침 ELEVATION·솔플레이트 TABLE을 모델값으로 연결
- 교대 입력값 카드: 형식 행에 시점·종점 표시, 제목을 "A1 입력값 [입력]"으로 변경
- 테스트 614건 통과, 타입 검사 통과

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

src/core/geometry.ts

@@ -77,6 +77,8 @@ export interface BlockModel {
   rowSkewDeg: number;
   /** Solplate of this bearing (C안, 2026-11-03): the pier's rule, the same for every bearing. */
   plan: SolplatePlan;
+  /** Block bottom from the 두부보 상면 slope (before any 교좌면 EL input), for the check against the input (2026-11-03). */
+  seatCalc: number;
 }
 
 /** Skew of a bearing row (deg) from the bearing azimuth and the stretch axis direction u (see {@link BlockModel.rowSkewDeg}). */
@@ -435,13 +437,17 @@ export function buildPier(input: PierInput): PierModel {
   const skewOf = (no: number, k: number) => rowSkewDeg(bearingAz.get(no) ?? NaN, axis.segments[k].u);
   // Solplate of every bearing from the pier's rule (C안, 2026-11-03): the same plan for each bearing.
   const plan = solplatePlan(input.solplate ?? SOLPLATE_RULE_DEFAULT);
+  // 교좌면 EL (2026-11-03): when the input gives it, the block bottom is that EL; otherwise the 두부보 상면 slope.
+  const seatOf = new Map(input.bearings.map((r) => [r.no, r.seatEl]));
   frontPlaced.forEach((b) => {
-    const bottom = segmentTop(segments, b.g);
-    blocks.push({ no: b.no, row: '전열', k: b.k, s: b.s, g: b.g, n: b.n, bottom, top: b.z - DIM.padThickness, padTop: b.z, rowSkewDeg: skewOf(b.no, b.k), plan });
+    const seatCalc = segmentTop(segments, b.g);
+    const bottom = seatOf.get(b.no) ?? seatCalc;
+    blocks.push({ no: b.no, row: '전열', k: b.k, s: b.s, g: b.g, n: b.n, bottom, top: b.z - DIM.padThickness, padTop: b.z, rowSkewDeg: skewOf(b.no, b.k), plan, seatCalc });
   });
   backPlaced.forEach((b) => {
-    const bottom = b.z - h2;
-    blocks.push({ no: b.no, row: '후열', k: b.k, s: b.s, g: b.g, n: b.n, bottom, top: b.z - DIM.padThickness, padTop: b.z, rowSkewDeg: skewOf(b.no, b.k), plan });
+    const seatCalc = b.z - h2;
+    const bottom = seatOf.get(b.no) ?? seatCalc;
+    blocks.push({ no: b.no, row: '후열', k: b.k, s: b.s, g: b.g, n: b.n, bottom, top: b.z - DIM.padThickness, padTop: b.z, rowSkewDeg: skewOf(b.no, b.k), plan, seatCalc });
   });
 
   const blockHeightFront = blocks.find((b) => b.row === '전열')!.top - blocks.find((b) => b.row === '전열')!.bottom;