fix: Showing the about panel is async on all platforms (#37440)

* fix: about panel is a base::Value::Dict

* nix this test for a diff PR

* what if the about dialog was not blocking

* add this test back in

* document synchronicity

* github editor is a fan of spaces

spec/api-app-spec.ts

@@ -1867,6 +1867,10 @@ describe('app module', () => {
         version: '1.2.3'
       });
     });
+
+    it('app.showAboutPanel() does not crash & runs asynchronously', () => {
+      app.showAboutPanel();
+    });
   });
 });