fix(grid): show exact total row count by default

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

@@ -310,8 +310,10 @@ interface DataGridProps {
 }
 
 const props = withDefaults(defineProps<DataGridProps>(), {
-  // Vue casts absent Boolean props to false unless the default is explicitly
-  // undefined; omitted row-action limits must keep normal table-data editing.
+  // Vue casts absent Boolean props to false unless a default is explicit.
+  // Regular grids have exact totals; document stores opt into lower-bound totals.
+  totalRowCountIsExact: true,
+  // Omitted row-action limits must keep normal table-data editing.
   allowInsertRows: undefined,
   allowDeleteRows: undefined,
 });

apps/desktop/src/components/grid/__tests__/DataGridTotalRowCount.spec.ts

@@ -0,0 +1,12 @@
+import { describe, expect, it } from "vitest";
+import DataGrid from "../DataGrid.vue";
+
+type VuePropDefinition = { default?: unknown };
+type VueComponentWithProps = { props?: Record<string, VuePropDefinition> };
+
+describe("DataGrid total row count exactness", () => {
+  it("treats totals as exact unless a caller explicitly marks them as a lower bound", () => {
+    const component = DataGrid as unknown as VueComponentWithProps;
+    expect(component.props?.totalRowCountIsExact?.default).toBe(true);
+  });
+});