refactor(abut): 벽체·흉벽 카드의 삽도 삭제

- 형상 카드의 삽도 SVG 표시를 제거하고, 삽도 모듈(src/view/abut-section-svg.ts)과 테스트를 삭제
- 입력 격자, 구간 표, 확인 필요 노트는 그대로 둠
- 테스트 637건 통과, 타입 검사·빌드 통과. 브라우저 시각 확인은 미실시

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

src/main.ts

@@ -12,7 +12,6 @@ import { applyAbutEdit, applyBearingEdit, applyShapeEdit, ABUT_EDIT_FIELDS, SHAP
 import { ABUT_SHAPE_DEFAULT, resolveShape } from './core/abut/shape';
 import { abutShown, piersShown } from './core/abut/visibility';
 import { abutMemberRows, ABUT_MEMBER_EDITABLE, type AbutMemberId } from './core/abut/member-list';
-import { abutSectionSvg } from './view/abut-section-svg';
 import type { WingForm } from './core/abut/geometry';
 import { buildMembers } from './core/abut/members';
 import { buildWings } from './core/abut/wings';
@@ -791,14 +790,6 @@ function fillAbutSlot(slot: (typeof ABUT_SLOTS)[keyof typeof ABUT_SLOTS], rec: A
   wingBox.replaceChildren();
   bearings.replaceChildren();
   shape.replaceChildren();
-  // 삽도 (벽체·흉벽 개략 단면): the values it names are the card's values, so the drawing follows each change.
-  const drawing = el('div', undefined, 'abut-section');
-  drawing.innerHTML = abutSectionSvg(
-    resolveShape(rec.shape),
-    { ...ABUT_SHAPE_DEFAULT, ...(rec.shape ?? {}) },
-    { seatEl: rec.seatEl, footingBottomEl: rec.foundationBottomEl, groundEl: rec.groundEl },
-  );
-  shape.append(drawing);
   msg.textContent = '';
   const apply = (next: AbutRecord) => {
     state.abutments = state.abutments.map((a) => (a.name === next.name ? next : a));