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/changes.ts

@@ -23,7 +23,7 @@ export const EDITABLE_FIELDS = [
 ] as const;
 
 /** Inputs tracked for overrides and pending changes: the numeric cards plus 열별 본수 (an array, compared by value). */
-export const TRACKED_KEYS = [...EDITABLE_FIELDS.map((f) => f.key), 'pileRows', 'groundPosition', 'groundWaterOn', 'groundWaterEl', 'floodLevelEl', 'scourDepthM', 'highWaterEl', 'lowWaterEl', 'strataRows', 'bearingType'] as const;
+export const TRACKED_KEYS = [...EDITABLE_FIELDS.map((f) => f.key), 'pileRows', 'groundPosition', 'groundWaterOn', 'groundWaterEl', 'floodLevelEl', 'scourDepthM', 'highWaterEl', 'lowWaterEl', 'strataRows', 'bearingType', 'bearingLayout'] as const;
 
 export type EditableKey = (typeof TRACKED_KEYS)[number];
 
@@ -52,6 +52,7 @@ export const FIELD_LABELS: Record<EditableKey, string> = {
   highWaterEl: '고조위 HWL',
   lowWaterEl: '저조위 LWL',
   bearingType: '받침 종류·용량',
+  bearingLayout: '받침 배치',
   strataRows: '지층 행',
 };