fix(fe): KsDataGrid - use AG Grid native Enter-to-Tab behavior

Removed custom navigateToNextCell function and binding.
Now relies on AG Grid's native :enter-navigates-to-next-cell setting.

This allows Enter key to properly use Tab navigation as intended.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/src/shared/ui/components/KsDataGrid.vue

@@ -185,19 +185,6 @@ function redrawRows(): void {
   gridApi.value?.redrawRows()
 }
 
-import type { NavigateToNextCellParams, CellPosition } from 'ag-grid-community'
-
-
-
-function navigateToNextCell(params: NavigateToNextCellParams): CellPosition | null {
-  const suggestedNextCell = params.nextCellPosition
-
-  if (params.key === 'Enter' || String(params.key) === '13') {
-    return suggestedNextCell
-  }
-
-  return suggestedNextCell
-}
 
 defineExpose({ focusRow, redrawRows, gridApi })
 </script>
@@ -213,7 +200,6 @@ defineExpose({ focusRow, redrawRows, gridApi })
       :row-class-rules="rowClassRules"
       :enter-navigates-to-next-cell="true"
       :enter-navigates-to-next-cell-after-edit="true"
-      :navigate-to-next-cell="navigateToNextCell"
       :stop-editing-when-cells-lose-focus="true"
       :loading="props.loading"
       overlay-no-rows-template="<div class='ks-ag-empty-overlay'><span style='font-size:2rem;'>📭</span><p style='margin-top:8px;font-weight:600;color:var(--ks-color-neutral-700);'>조회된 데이터가 없습니다</p><p style='font-size:12px;color:var(--ks-color-neutral-500);'>검색 조건을 변경하거나 신규 데이터를 수집하세요.</p></div>"