feat(rebar): 확대기초 단면 그림에서 B1–B4와 B10-1 제외

- B1–B4 선, B2 다리선, B1–B4 풍선 제거 (그림에서만, 철근표·3D는 그대로)
- B10-1 점과 풍선 제거, 범례의 B1–B4·B10 항목 제거
- 테스트 갱신

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

src/view/footing-section-svg.ts

@@ -6,8 +6,7 @@ import { DEFAULT_FOOTING_REBAR } from '../core/rebar/footing-settings';
 /**
  * 확대기초 · 교각축 직각 단면 (폭 W) (승인 2026-10-26, 추천안 1·2단계). A cut across the footing width: horizontal = W, vertical = height
  * from the 하면 at true scale. Every mark comes from the same functions as the rebar table and the 3D view:
- * - B1–B4 orange lines (bars along W, cover to cover), B5–B8 teal points on the grid along W (방향 교환), B9 purple lines per row,
- * - B10-1 green points at both W faces per level, B11 grey dashed lines per assembly level, B12 grey points on its W grid.
+ * - B5–B8 teal points on the grid along W (방향 교환), B9 purple lines per row, B11 grey dashed lines, B12 grey points (B1–B4 and B10-1 are not drawn in this view, 승인 2026-10-27),
  * Legs are not drawn; the B6 leg length is noted in the figure. The column and the piles are shown as context.
  * Each mark carries data-bar="<철근 번호>" so a bubble can highlight its bars (철근표 강조와 같은 방식).
  */
@@ -69,15 +68,6 @@ export function footingSectionSvg(model: PierModel): string {
   // Cover lines on the W faces (측면 피복 c_s).
   const xa = x(-W / 2 + fs.cSide);
   const xb = x(W / 2 - fs.cSide);
-  // B1–B4 (방향 교환, 승인 2026-10-26): run along W, so in this section they are lines from cover to cover.
-  // The B2 legs turn up to the B1 height at both W ends (측면 피복선), drawn heavier.
-  parts.push(line('b1', 'B1', xa, xb, y(z.B1), COLOR.b14, 1.4));
-  parts.push(line('b2', 'B2', xa, xb, y(z.B24), COLOR.b14, 1.6));
-  parts.push(line('b3', 'B3', xa, xb, y(z.B3), COLOR.b14, 1.2));
-  parts.push(line('b4', 'B4', xa, xb, y(z.B24), COLOR.b14, 1.2));
-  for (const xx of [xa, xb]) {
-    parts.push(`<line class="leg" data-bar="B2" x1="${xx.toFixed(1)}" x2="${xx.toFixed(1)}" y1="${y(z.B1).toFixed(1)}" y2="${y(z.B24).toFixed(1)}" stroke="${COLOR.b14}" stroke-width="1.8"/>`);
-  }
   // B6 leg note: the B6 leg runs from the 하면 1단 up to the B5 height (B6 다리 → B5 높이), shown in the right margin below.
 
   // B5–B8 (방향 교환): run along L and are spaced along W (sW). In this section they are points on the W grid:
@@ -107,15 +97,7 @@ export function footingSectionSvg(model: PierModel): string {
   const b9 = b9Bars(L, W, [], 2000, fs);
   for (const n of [...new Set(b9.bars.map((b) => b.n))]) parts.push(vline('b9', 'B9', x(n), y(z.B24), y(z.B5), COLOR.b9));
 
-  // B10-1: green points at both W faces, one per level above the lowest (8 of 9 levels), at the side depth of the table.
   const levels = b10Levels(H, fs);
-  const dB1 = sideDepth(NOMINAL_DIAMETER.S29, NOMINAL_DIAMETER.S19, fs);
-  // The lowest level is removed (승인 2026-10-26): the 하면 1단 B2·B4 take its place at the corner.
-  for (let j = 1; j < levels; j++) {
-    const zj = fs.cBottom + j * fs.sV;
-    parts.push(dot('b10', 'B10-1', x(-W / 2 + dB1), y(zj), COLOR.b10, 2.2));
-    parts.push(dot('b10', 'B10-1', x(W / 2 - dB1), y(zj), COLOR.b10, 2.2));
-  }
 
   // B11: grey dashed lines per assembly level. B12: grey points on its W grid, every k·s, on the even grid (1단계 규칙).
   const js = assemblyJs(H, fs);
@@ -163,19 +145,12 @@ export function footingSectionSvg(model: PierModel): string {
   const yBot = Y0 + 100;
   // Each bottom bubble sits straight below its own bar (B2 left of centre, B4 at centre, B3 right of centre) on a bar of the right parity.
   parts.push(bubble('B5', xa + 12, yTop, x(xsW[1]), y(z.B5), COLOR.b5));
-  parts.push(bubble('B1', cx - 60, yTop, cx - 60, y(z.B1), COLOR.b14));
   parts.push(bubble('B11', xb - 20, yTop, xb, y(zB11), COLOR.b11));
-  parts.push(bubble('B10-1', X0 - 18, y(fs.cBottom + (levels - 1) * fs.sV / 2), X0 + 2, y(fs.cBottom + (levels - 1) * fs.sV / 2), COLOR.b10));
-  parts.push(bubble('B2', cx - 70, yBot, cx - 70, y(z.B24), COLOR.b14));
-  parts.push(bubble('B4', cx, yBot, cx, y(z.B24), COLOR.b14));
-  parts.push(bubble('B3', cx + 70, yBot, cx + 70, y(z.B3), COLOR.b14));
 
   // Legend (선 모양별, 삽도 기준) and the units note.
   const yLeg = 352;
   parts.push(`<circle cx="20" cy="${yLeg}" r="2.6" fill="${COLOR.b5}"/>${text(28, yLeg + 3, '주철근 (B5–B8)', 'start', COLOR.outline)}`);
-  parts.push(`<line x1="180" x2="204" y1="${yLeg}" y2="${yLeg}" stroke="${COLOR.b14}" stroke-width="1.6"/>${text(212, yLeg + 3, '직각·보조 (B1–B4)', 'start', COLOR.outline)}`);
   parts.push(`<line x1="330" x2="330" y1="${yLeg - 8}" y2="${yLeg + 8}" stroke="${COLOR.b9}" stroke-width="1"/>${text(338, yLeg + 3, '전단·띠 (B9)', 'start', COLOR.outline)}`);
-  parts.push(`<circle cx="20" cy="${yLeg + 22}" r="2.2" fill="${COLOR.b10}"/>${text(28, yLeg + 25, '측면 수평 (B10-1 · B10-2)', 'start', COLOR.outline)}`);
   parts.push(`<line x1="250" x2="274" y1="${yLeg + 22}" y2="${yLeg + 22}" stroke="${COLOR.b11}" stroke-width="1.2" stroke-dasharray="6 3"/>${text(280, yLeg + 25, '조립 (B11·B12)', 'start', COLOR.outline)}`);
   parts.push(text(20, yLeg + 48, '치수 mm · 높이 방향은 실제 비율 · 다리 생략 (B6 다리는 주석) · 기준: 확대기초 하면 0', 'start', COLOR.outline));