feat(copy): 코핑의 끝단 높이 h1, 테이퍼 높이 h2, Level 폭을 복사 항목에 추가

- COPY_ITEMS에 coping-h1, coping-h2, level-width 추가 (기본 해제)
- 코핑 부재의 복사 항목에 포함, 바뀐 값이 있으면 기본으로 체크
- 테스트 갱신 및 h1·Level 폭 기본 체크 테스트 추가

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

src/core/copy-targets.ts

@@ -34,7 +34,7 @@ export function selectedTargets(piers: CopyCandidate[], sourceName: string, same
 /** 부재 → 복사 항목. A member with no copy items (기둥, 받침) copies nothing yet. */
 export const MEMBER_COPY_ITEMS: Record<MemberId, CopyItem[]> = {
   bearing: [],
-  coping: ['coping-width', 'coping-length'],
+  coping: ['coping-width', 'coping-length', 'coping-h1', 'coping-h2', 'level-width'],
   column: [],
   footing: ['pile-length', 'pile-rows'],
   ground: ['ground-position'],

src/core/copy.ts

@@ -5,7 +5,7 @@ import type { PierInput } from './types';
  * 속성 복사 (spec §9 · plan C7). Copies chosen attributes from one pier to others.
  * Values the spec never copies (coordinates, IP, elevations, names) are not in any item, so they cannot be copied.
  */
-export type CopyItem = 'coping-width' | 'coping-length' | 'pile-length' | 'pile-rows' | 'ground-position';
+export type CopyItem = 'coping-width' | 'coping-length' | 'coping-h1' | 'coping-h2' | 'level-width' | 'pile-length' | 'pile-rows' | 'ground-position';
 
 interface ItemRule {
   label: string;
@@ -19,6 +19,9 @@ interface ItemRule {
 export const COPY_ITEMS: Record<CopyItem, ItemRule> = {
   'coping-width': { label: '코핑 폭', keys: ['copingWidthMm'], defaultOn: true, pileItem: false },
   'coping-length': { label: '코핑 길이 L', keys: ['copingLengthMm'], defaultOn: false, pileItem: false },
+  'coping-h1': { label: '끝단 높이 h1', keys: ['copingH1Mm'], defaultOn: false, pileItem: false },
+  'coping-h2': { label: '테이퍼 높이 h2', keys: ['copingH2Mm'], defaultOn: false, pileItem: false },
+  'level-width': { label: 'Level 폭', keys: ['levelWidthMm'], defaultOn: false, pileItem: false },
   'pile-length': { label: '말뚝 길이', keys: ['pileLengthMm'], defaultOn: false, pileItem: true },
   'pile-rows': { label: '열별 본수', keys: ['pileRows'], defaultOn: false, pileItem: true },
   'ground-position': { label: '지반 위치·지하수위', keys: ['groundPosition', 'groundWaterOn', 'groundWaterEl', 'floodLevelEl', 'highWaterEl', 'lowWaterEl'], defaultOn: false, pileItem: false },