feat(ground): 지반·지층 card inputs, layer rows, water level, section drawing

- types/ground.ts: 위치 (육상·하상·해상), 지하수위 고려 and EL, 지층 행
  (name and 하단 EL, from the top down). Checks G01 (layer order), G02 (water
  level range), G03 (layer name).
- The 지반고 still feeds the soil cover check; the layer rows and water level
  are inputs and do not change the 3D model.
- view/ground-svg.ts: the 삽도 drawn from the inputs and the generated
  footings and piles on one EL scale.
- 일괄 적용 copies 위치 and 지하수위 to the checked piers (속성 복사 item,
  off by default). Changes list shows arrays and booleans as text.

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'] as const;
+export const TRACKED_KEYS = [...EDITABLE_FIELDS.map((f) => f.key), 'pileRows', 'groundPosition', 'groundWaterOn', 'groundWaterEl', 'strataRows'] as const;
 
 export type EditableKey = (typeof TRACKED_KEYS)[number];
 
@@ -44,6 +44,10 @@ export const FIELD_LABELS: Record<EditableKey, string> = {
   pileLengthMm: '말뚝 길이',
   groundEl: '지반고 EL',
   pileRows: '열별 본수',
+  groundPosition: '지반 위치',
+  groundWaterOn: '지하수위 고려',
+  groundWaterEl: '지하수위 EL',
+  strataRows: '지층 행',
 };
 
 /** Keys whose values differ between two inputs. Arrays are compared by value. */