refactor(copy): 대상 교각의 같은 형식 필터와 같은 형식 모두 선택 버튼 제거

- "원본과 같은 형식만" 체크박스와 "같은 형식 모두 선택" 버튼 삭제, "선택 해제"는 유지
- 대상 칩에 원본과 형식이 다르면 "형식 다름" 표시
- copyCandidates와 selectedTargets에서 형식 필터 인자 제거, 테스트 갱신
- 테스트 타입 오류(optional 필드) 수정

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

tests/copy-targets.test.ts

@@ -12,32 +12,31 @@ const piers: CopyCandidate[] = [
 
 describe('copyCandidates (대상 후보)', () => {
   it('excludes the source pier', () => {
-    expect(copyCandidates(piers, 'P3', false).map((c) => c.name)).not.toContain('P3');
+    expect(copyCandidates(piers, 'P3').map((c) => c.name)).not.toContain('P3');
   });
 
-  it('keeps only the source type when 같은 형식만 is on', () => {
-    expect(copyCandidates(piers, 'P3', true).map((c) => c.name)).toEqual(['P1', 'P2', 'P5']);
+  it('offers piers of every type, so a different type is visible', () => {
+    expect(copyCandidates(piers, 'P3').map((c) => c.type)).toEqual(['T형', 'T형', 'Y형', 'T형']);
   });
 
   it('marks a pier without a model as not selectable', () => {
-    const p5 = copyCandidates(piers, 'P3', false).find((c) => c.name === 'P5');
+    const p5 = copyCandidates(piers, 'P3').find((c) => c.name === 'P5');
     expect(p5?.selectable).toBe(false);
   });
 });
 
 describe('selectedTargets (선택한 대상만)', () => {
   it('is empty when nothing is ticked', () => {
-    expect(selectedTargets(piers, 'P3', false, new Set())).toEqual([]);
+    expect(selectedTargets(piers, 'P3', new Set())).toEqual([]);
   });
 
   it('returns only ticked, selectable piers', () => {
     const picked = new Set(['P1', 'P4', 'P5']);
-    expect(selectedTargets(piers, 'P3', false, picked)).toEqual(['P1', 'P4']);
+    expect(selectedTargets(piers, 'P3', picked)).toEqual(['P1', 'P4']);
   });
 
-  it('ignores a tick on a pier hidden by the same-type filter', () => {
-    const picked = new Set(['P4']);
-    expect(selectedTargets(piers, 'P3', true, picked)).toEqual([]);
+  it('keeps a tick on a pier of another type', () => {
+    expect(selectedTargets(piers, 'P3', new Set(['P4']))).toEqual(['P4']);
   });
 });
 
@@ -82,7 +81,7 @@ describe('copyItemsWithOverrides (기준 교각에서 되돌리기가 표시된
   });
 
   it('selects the coping h1, h2 and Level 폭 items when those values changed', () => {
-    expect(copyItemsWithOverrides(source({ copingH1Mm: base.copingH1Mm + 1, levelWidthMm: base.levelWidthMm + 1 }))).toEqual(['coping-h1', 'level-width']);
+    expect(copyItemsWithOverrides(source({ copingH1Mm: (base.copingH1Mm ?? 0) + 1, levelWidthMm: (base.levelWidthMm ?? 0) + 1 }))).toEqual(['coping-h1', 'level-width']);
   });
 
   it('ignores a changed value that no copy item carries (groundEl)', () => {