feat(view): 전단철근 구간 표 on the ③ coping tab (시안 ③)

- Segments of C9 (좌 경사), C10 (Level), C11 (우 경사): first and last bar in
  metres, spacing, count, and bar number. From the bar positions (코핑철근.md §3).
- Test: 0.300–4.550 (18 @250), 4.800–7.200 (9 @300), 7.450–11.700 (18 @250).
- Not verified in a browser.

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

src/main.ts

@@ -11,6 +11,7 @@ import { adjustRow, layoutText, resolveRowCounts, rowLayout, totalPiles } from '
 import { applyCopy, DEFAULT_COPY_ITEMS, planCopy, type CopyItem } from './core/copy';
 import { pileGeometry } from './core/geometry';
 import { rebarSummary, type RebarRow } from './core/rebar/summary';
+import { shearSegments } from './core/rebar/coping';
 import { DEFAULT_MATERIAL, isAssumedMaterial, type Material } from './core/rebar/common';
 import { allVisibleChecked, setVisibleChecked, type TypeFilter } from './core/selection';
 import { choose, defaultSummary, isSelectable, SHAPE_GROUPS, UNDEFINED_REASON, type MemberId } from './core/shape-options';
@@ -788,6 +789,32 @@ function renderRebar(): void {
   }
   $('step3-status').textContent = `계산됨 · 경고 ${warnings.length}`;
   renderMaterial();
+  // 전단철근 구간 표 (시안 ③ 코핑 탭): segments of C9 / C10 / C11 along the coping, in metres.
+  if (state.rebarMember === 'coping') {
+    const seg = shearSegments(pier.model.copingL * 1000);
+    const st = el('table', undefined, 'grid-table rebar-table');
+    const sh = el('thead');
+    const shr = el('tr');
+    for (const h of ['구간', '시작 (m)', '끝 (m)', '간격 (mm)', '개수', '번호']) shr.appendChild(el('th', h));
+    sh.appendChild(shr);
+    st.appendChild(sh);
+    const sb = el('tbody');
+    for (const g of seg) {
+      const tr = el('tr');
+      tr.append(
+        el('td', g.segment),
+        el('td', (g.from / 1000).toFixed(3)),
+        el('td', (g.to / 1000).toFixed(3)),
+        el('td', String(g.spacing)),
+        el('td', String(g.count)),
+        el('td', g.bar),
+      );
+      sb.appendChild(tr);
+    }
+    st.appendChild(sb);
+    box.appendChild(el('p', '전단철근 구간 (끝면 기준, 철근 위치의 처음과 끝)', 'lbl'));
+    box.appendChild(st);
+  }
   const focused = box.querySelector('tr.hl');
   if (focused && state.rebarFocus) focused.scrollIntoView({ block: 'center' });
 }