feat(view): solplate in the 3D model (2단계): wedges from the drawing's A, B, S; read the solplate table from DXF

Each bearing gets a solplate wedge: tapered along the 교축 with T1 on the 시점 side, underside at the bearing top (block
top + h3). A, B come from the drawing's ELEVATION table, S and T1/T2 from the SOLPLATE table (NO, S(%), L, W, T, T1, T2),
read by position. The 공통 규칙 (T 30, margin 100, h3 181) feed the plan; changing them regenerates the piers. A new
"솔플레이트" part can be shown or hidden. A solplate table is read only when its S values are found; a missing S is reported.
Also commits the option-1 test change (drawing EL.X minus Excel z).

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

tests/solplate-scene.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it } from 'vitest';
+import * as THREE from 'three';
+import { buildPier } from '../src/core/geometry';
+import { solplateGeometry } from '../src/core/solplate';
+import { BEARING_ELEVATION_REF, SOLPLATE_REF } from '../src/core/bearing-ref';
+import { buildPierScene } from '../src/view/scene';
+import { loadP1 } from './helpers';
+
+const plans = SOLPLATE_REF.map((s, i) => ({ no: s.no, A: BEARING_ELEVATION_REF[i].A, B: BEARING_ELEVATION_REF[i].B, S: s.s }));
+
+describe('솔플레이트 모델과 3D (2단계, 승인 2026-10-23)', () => {
+  it('without plans there is no solplate; with plans every bearing has one', () => {
+    expect(buildPier(loadP1()).blocks.every((b) => b.plan === undefined)).toBe(true);
+    const m = buildPier({ ...loadP1(), bearingPlans: plans, solplate: { T: 30, margin: 100, h3: 181 } });
+    expect(m.blocks.every((b) => b.plan !== undefined)).toBe(true);
+    expect(m.blocks[0].plan!.A).toBe(700);
+  });
+
+  it('the 3D scene has one solplate wedge per bearing, and its height is the bearing top plus T', () => {
+    const m = buildPier({ ...loadP1(), bearingPlans: plans, solplate: { T: 30, margin: 100, h3: 181 } });
+    const scene = buildPierScene(m);
+    const wedges = scene.parts.solplates.children;
+    expect(wedges.length).toBe(10);
+    const box = new THREE.Box3().setFromObject(scene.parts.solplates);
+    // The highest point is the thick (시점) end of the tallest wedge: underside (block top + h3) + T1.
+    const top = Math.max(...m.blocks.map((b) => solplateGeometry(b, 181, { A: b.plan!.A, B: b.plan!.B, margin: 100, T: 30, slopePct: b.plan!.S }).bottom + solplateGeometry(b, 181, { A: b.plan!.A, B: b.plan!.B, margin: 100, T: 30, slopePct: b.plan!.S }).T1));
+    expect(box.max.y).toBeCloseTo(top, 3);
+  });
+
+  it('without plans the scene has an empty solplate part', () => {
+    const scene = buildPierScene(buildPier(loadP1()));
+    expect(scene.parts.solplates.children.length).toBe(0);
+  });
+});