feat(rebar,view): coping end height h1, taper h2 and Level width as inputs on ② (1단계)

The three values are inputs on the coping card, with the P1 values (1000 · 1500 · 2100) when absent, and they are tracked
like the other shape inputs. The geometry and the coping rebar read them from one CopingGeom: the U heights follow the
closed form (h1 − 2c) + h2·min(x_s, x_L0)/x_L0, which reproduces the P1 values. The side rows are assumed to keep their
position relative to the Level underside (명세 확인 필요). P1 results are unchanged; the full suite passes.

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

src/core/changes.ts

@@ -7,6 +7,9 @@ import type { PierInput } from './types';
 export const EDITABLE_FIELDS = [
   { key: 'copingWidthMm', label: '코핑 폭 B', unit: 'mm' },
   { key: 'copingLengthMm', label: '코핑 길이 L', unit: 'mm' },
+  { key: 'copingH1Mm', label: '끝단 높이 h1', unit: 'mm' },
+  { key: 'copingH2Mm', label: '테이퍼 높이 h2', unit: 'mm' },
+  { key: 'levelWidthMm', label: 'Level 폭', unit: 'mm' },
   { key: 'pileLengthMm', label: '말뚝 길이', unit: 'mm' },
 ] as const;
 
@@ -18,6 +21,9 @@ export type EditableKey = (typeof TRACKED_KEYS)[number];
 export const FIELD_LABELS: Record<EditableKey, string> = {
   copingWidthMm: '코핑 폭 B',
   copingLengthMm: '코핑 길이 L',
+  copingH1Mm: '끝단 높이 h1',
+  copingH2Mm: '테이퍼 높이 h2',
+  levelWidthMm: 'Level 폭',
   pileLengthMm: '말뚝 길이',
   pileRows: '열별 본수',
 };