feat(bearing): 일체 choice gated by the pair eccentricity rule (승인 2026-10-26)

- PierInput.bearingLayout: 분리 (default) or 일체, tracked for changes.
- 일체 is selectable only when there is at least one pair and every pair is
  within 100 mm; otherwise the chip is disabled with the reason.
- Validation: B01 (info) when 일체 is chosen and allowed, the block shape is
  still the 분리 shape; B02 (warning) when it is not allowed and the model
  falls back to 분리.
- The 일체 block shape (2500 × 1200) is not modelled yet.

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

src/core/shape-options.ts

@@ -22,7 +22,7 @@ const x = (label: string): ShapeOption => ({ label, isDefault: false });
 const ok = (label: string): ShapeOption => ({ label, isDefault: false, confirmed: true });
 
 export const SHAPE_GROUPS: Record<MemberId, ShapeGroup[]> = {
-  bearing: [{ title: '배치', options: [d('분리'), x('일체')] }],
+  bearing: [{ title: '배치', options: [d('분리'), ok('일체')] }],
   coping: [
     { title: '교좌면', options: [d('직각'), x('모따기'), x('라운드')] },
     { title: '하면', options: [d('직선'), x('곡선 오목'), x('곡선 볼록')] },