fix(ground): one 위치 control on the card and clearer layer labels

- The 위치 buttons duplicated the 형상 옵션 chips above the card. The chips
  stay the one place for 위치 (only the default is selectable until Q6).
- The water-level row lays out as a flex row, so its label and input do not
  overlap.
- The 연암 상면 caption sits just under the line instead of over the band label.

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

src/main.ts

@@ -17,7 +17,7 @@ import { DEFAULT_MATERIAL, FCK_MEMBERS, fyOf, GRADE_CHOICES, isAssumedMaterial,
 import { buildQuantity, quantityRows, type Quantity, type QuantityLine } from './core/rebar/quantity';
 import { parseDrawingRows } from './core/drawing-import';
 import { groundElFor, parseGroundModel, strataRowsFor, type GroundModelFile } from './core/ground-model';
-import { GROUND_POSITIONS, STRATA_NAMES } from './core/ground';
+import { STRATA_NAMES } from './core/ground';
 import { groundSectionSvg } from './view/ground-svg';
 import { parseBearingElevationTable, parseSolplateTable, readDxfTexts } from './core/dxf-table';
 import { columnDiameterIssues } from './core/column-check';
@@ -1550,19 +1550,14 @@ function renderGroundModel(box: HTMLDivElement, pier: Pier): void {
   const d = pier.draft;
   const wrap = el('div', undefined, 'ground-model');
 
-  wrap.appendChild(el('p', '위치', 'lbl'));
-  const positions = el('div', undefined, 'opts');
-  for (const v of GROUND_POSITIONS) {
-    const b = el('button', v, 'btn small');
-    b.type = 'button';
-    b.setAttribute('aria-pressed', String((d.groundPosition ?? '육상') === v));
-    b.addEventListener('click', () => editGround(name, 'groundPosition', v));
-    positions.appendChild(b);
-  }
-  wrap.appendChild(positions);
+  // 위치 is the 형상 옵션 of this member (the chips above the card); only the default is selectable until Q6.
 
   wrap.appendChild(el('p', '지하수위', 'lbl'));
   const water = el('div', undefined, 'ground-water');
+  water.style.display = 'flex';
+  water.style.flexWrap = 'wrap';
+  water.style.alignItems = 'center';
+  water.style.gap = '8px';
   const check = el('input');
   check.type = 'checkbox';
   check.checked = d.groundWaterOn === true;