V13-FE-006: consolidate approved UI and contract hardening

frontend/src/shared/ui/gridColumnAdapter.ts

@@ -0,0 +1,20 @@
+import type { KbxGridColumn } from '@shared/contracts/kbx-types'
+import type { UiGridColumn } from './adapter/contracts'
+
+/** Converts registry-owned KBX columns into the provider-neutral grid contract. */
+export function toUiGridColumns(columns: readonly KbxGridColumn[]): UiGridColumn[] {
+  return columns.map(column => {
+    if (typeof column.field !== 'string') {
+      throw new Error(`Grid column field must be a string: ${String(column.field)}`)
+    }
+
+    return {
+      field: column.field,
+      header: column.header,
+      width: typeof column.width === 'number' ? column.width : undefined,
+      sortable: column.sortable,
+      filterable: column.filterable,
+      formatter: column.formatter,
+    }
+  })
+}