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/style.css

@@ -869,13 +869,6 @@ body { background: #eef1f4; font-family: 'Noto Sans KR', system-ui, sans-serif;
 .quantity-total { margin-bottom: 16px; }
 
 /* 교대 삽도 (벽체·흉벽 개략 단면): fills the panel width; the labels follow the card's values. */
-.abut-section { margin-bottom: 12px; background: #f6f8fa; border: 1px solid #d5dbe2; border-radius: 6px; padding: 8px; }
-.abut-section svg { display: block; width: 100%; height: auto; }
-.abut-section text { font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 12px; fill: #18212b; }
-.abut-section rect { stroke: #55606e; stroke-width: 1; }
-.abut-section .abut-footing { fill: #b9c3ce; }
-.abut-section .abut-wall { fill: #d8dee6; }
-.abut-section .abut-parapet { fill: #9aa7b5; }
 
 /* ② 형상계획: with an abutment selected, only the abutment card shows; the pier cards are hidden (2026-11-03). */
 #view-plan.abut-selected .members-title,
@@ -890,9 +883,9 @@ body { background: #eef1f4; font-family: 'Noto Sans KR', system-ui, sans-serif;
 #view-plan.abut-selected #abut-members { display: block; }
 #abut-members .pier-name span:first-child { display: block; }
 
-/* 교대 형상 입력: the 삽도 on top, then a 3-column grid of input · default (시안 ②), the 확인 필요 notes at the end (2026-11-03). */
+/* 교대 형상 입력: a 3-column grid of input · default (시안 ②), the 확인 필요 notes at the end (2026-11-03). */
 #abut-panel-plan-shape, #abut-panel-shape { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr); gap: 6px 10px; align-items: center; }
-#abut-panel-plan-shape > .abut-section, #abut-panel-shape > .abut-section, #abut-panel-plan-shape > .abut-qa { grid-column: 1 / -1; }
+#abut-panel-plan-shape > .abut-qa { grid-column: 1 / -1; }
 .abut-qa { border-top: 1px solid #d5dbe2; padding-top: 8px; }
 .abut-qa p { margin: 3px 0; }