fix(bearing): C4·C5 are the 교축 distances from the bearing to the block edges (승인 2026-10-26)

- bearingEdgeDistances now reads the block geometry: 분리 1200 blocks are
  centred on the bearing (600 / 600); 일체 uses the pair's 2500 block (outer
  margins 601, within the 5 mm tolerance of 600).
- The plan labels C4 and C5 from these values; the coping-edge definition is removed.

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

src/view/bearing-plan-svg.ts

@@ -57,14 +57,12 @@ export function bearingPlanSvg(m: PierModel, pairIndex: number, overlay?: Bearin
     parts.push(`<text x="${X(b.n) + 70}" y="${Y(b.s) - 60}" font-size="90" fill="#18212B">${b.no}</text>`);
   }
 
-  // Dimensions: C2 between the bearing centres, C4 and C5 from the coping edges (교각축 직각), C1 to the block edges.
+  // Dimensions: C2 between the bearing centres, C4 and C5 from the bearing to the block edges (교축).
   const dist = bearingEdgeDistances(m);
   const d = (no: number) => dist.find((x) => x.no === no)!;
-  const half = m.copingB / 2;
   parts.push(`<text x="${(X(f.n) + X(k.n)) / 2}" y="${Y(f.s) + 180}" text-anchor="middle" font-size="90" fill="#18212B">C2 ${Math.round(Math.abs(k.n - f.n) * 1000)}</text>`);
   parts.push(`<text x="${X(f.n) - 760}" y="${Y(f.s)}" text-anchor="end" font-size="90" fill="#18212B">C4 ${Math.round(d(f.no).leftMm)}</text>`);
   parts.push(`<text x="${X(k.n) + 760}" y="${Y(k.s)}" font-size="90" fill="#18212B">C5 ${Math.round(d(k.no).rightMm)}</text>`);
-  parts.push(`<text x="${X(half)}" y="${Y(f.s) - 760}" text-anchor="end" font-size="80" fill="#55606E">코핑 폭 B ${Math.round(m.copingB * 1000)}</text>`);
 
   return `<svg viewBox="-1800 -1000 3600 2000" width="100%" style="max-width: 560px; height: auto" role="img" aria-label="교량받침 상세 평면: 쌍 ${pair.frontNo}·${pair.backNo}, 블록 윤곽, 솔플레이트, 도면값 겹쳐 보기">${parts.join('')}</svg>`;
 }