test(desktop): pin the About reader's missing-provider throw

apps/desktop/src/main/__tests__/app-update-provider-scope.test.ts

@@ -256,4 +256,13 @@ describe('AppUpdateProvider render scope', () => {
     });
     await act(async () => root.unmount());
   });
+
+  test('throws for an About reader mounted outside AppUpdateProvider', () => {
+    const { root } = installReactRenderer();
+    assert.throws(
+      () => act(() => root.render(createElement(AboutProbe))),
+      { message: 'AppUpdateProvider is missing' },
+    );
+    assert.equal(aboutRenders, 0);
+  });
 });

apps/desktop/src/renderer/settings/about-settings-page.tsx

@@ -63,12 +63,8 @@ const linkInRowEnd = { paddingInline: 'var(--spacing-3)' } as const;
 type AboutCopy = ReturnType<typeof getSettingsPreferencesCopy>['about'];
 
 /**
- * The updater's row, rendered only for a packaged install. Update state is not
- * this page's to own: the App Update feature holds the renderer's sole updater
- * subscription above AppShell and publishes About's projection, so the row
- * reads status from the consumer and issues the feature's guarded check
- * instead of touching the bridge. A component rather than the consumer's
- * render callback because the action guard is a hook.
+ * About's update row for a packaged install. A component rather than the
+ * consumer's render callback because the action guard is a hook.
  */
 function AboutUpdateStatusRow(props: {
   readonly update: AppUpdateAboutProjection;