fix(rebar): 정면 dimension labels larger and the lines spaced clear of the 코핑 길이 text

- The two chains are raised and their labels enlarged (220 mm).
- 코핑 길이 sits above both chains; 기둥 중심 has its own line between them.

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

tests/coping-rebar-svg.test.ts

@@ -69,8 +69,8 @@ describe('정면 두 번째 치수선과 범례 (승인 2026-10-26, 시안)', ()
 describe('정면 치수는 3D 철근 위치에서 계산 (승인 2026-10-26)', () => {
   it('the chains come from the bar positions and match the 시안 values', () => {
     const svg = copingFrontSvg(scene.records, model.copingL * 1000, model.columns[0].s);
-    const texts = [...svg.matchAll(/font-size="150"[^>]*>([^<]*)</g)].map((x) => x[1]);
-    expect(texts).toEqual(['300', '18@250=4500', '8@300=2400', '18@250=4500', '300', '900', '10@1000=10000', '900', '기둥 중심']);
+    const texts = [...svg.matchAll(/font-size="220"[^>]*>([^<]*)</g)].map((x) => x[1]);
+    expect(texts).toEqual(['300', '18@250=4500', '8@300=2400', '18@250=4500', '300', '900', '10@1000=10000', '900']);
   });
 });