fix(grid): row detail now respects hidden column state

Row detail dialog was using displayableColumnIndexes instead of
visibleColumnIndexes, causing columns hidden via "hide null columns"
or manual hiding to still appear in the detail view.

apps/desktop/src/components/grid/DataGrid.vue

@@ -2755,7 +2755,7 @@ const rowDetail = computed(() => {
     rowId: item.id,
     row: item.data,
     columns: props.result.columns,
-    columnIndexes: displayableColumnIndexes.value,
+    columnIndexes: visibleColumnIndexes.value,
     typeByColumn: columnTypeMap.value,
     commentByColumn: columnCommentMap.value,
     displayValue: (value, index) => formatCellCached(value, index),