fix(rebar): turn the S1 layout dimension to run along the 교각축 beside the block

- The S1 layout runs along the 교각축 (vertical in the plan), so its text sits
  beside the block, turned to match, instead of across the gap between blocks.

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

src/view/block-rebar-plan-svg.ts

@@ -63,7 +63,8 @@ export function blockRebarPlanSvg(m: PierModel, pairIndex = 0): string {
     const [bx, by] = P(wA / 2 + 0.22, 0);
     parts.push(`<text x="${bx}" y="${by}" text-anchor="middle" font-size="80" fill="#0F5C66">${layout(a2d.count, a2d.spacing, a2d.firstEnd)}</text>`);
     const [rx, ry] = P(0, wC / 2 + 0.22);
-    parts.push(`<text x="${rx}" y="${ry}" text-anchor="start" font-size="80" fill="#B4531F">${layout(a1d.count, a1d.spacing, a1d.firstEnd)}</text>`);
+    // The S1 layout runs along the 교각축 (vertical in the plan), so its text is turned to read along that dimension line.
+    parts.push(`<text x="${rx}" y="${ry}" transform="rotate(-90 ${rx} ${ry})" text-anchor="middle" font-size="80" fill="#B4531F">${layout(a1d.count, a1d.spacing, a1d.firstEnd)}</text>`);
     const [wx, wy] = P(-wA / 2 - 0.2, 0);
     parts.push(`<text x="${wx}" y="${wy}" text-anchor="end" font-size="90" fill="#18212B">${Math.round(wC * 1000)}</text>`);
     return P;