test(mobile): assert the Details list labels the completion timestamp

apps/mobile/src/components/code-reviewer/review-detail-screen.mounted.test.tsx

@@ -398,6 +398,39 @@ describe('ReviewDetailScreen outcome-first order', () => {
   });
 });
 
+describe('ReviewDetailScreen details metadata', () => {
+  it('labels the completion-timestamp row in the Details list', () => {
+    // The Details key-value list pairs every label with its value. The
+    // completion row must render the "Completed" label ahead of its timestamp
+    // value; a value-only row there would collapse the two-column alignment.
+    detail.data = {
+      success: true,
+      review: makeReview({
+        status: 'completed',
+        started_at: null,
+        completed_at: '2024-01-01T00:05:00.000Z',
+      }),
+      tokenUsage: { input: 0, output: 0 },
+    };
+
+    const texts = renderScreen();
+
+    // `timeAgo` is mocked to "now" in this suite, so the Details completion row
+    // is the only "Completed" immediately followed by "now": the status
+    // conclusion is followed by "Findings" and the Gate status value by its
+    // "Threshold" row.
+    const completionRowIndex = texts.findIndex(
+      (text, index) => text === 'Completed' && texts[index + 1] === 'now'
+    );
+    const detailsHeaderIndex = texts.indexOf('Details');
+    // Assert the header was found before comparing: `indexOf` returns -1 on a
+    // copy change, and `completionRowIndex >= 0` would then satisfy the
+    // placement check without proving the row sits inside the Details list.
+    expect(detailsHeaderIndex).toBeGreaterThanOrEqual(0);
+    expect(completionRowIndex).toBeGreaterThan(detailsHeaderIndex);
+  });
+});
+
 describe('ReviewDetailScreen empty council', () => {
   it('renders "No findings" for a null council result (not a success checkmark)', () => {
     detail.data = {