test(safe-area): update application

Update styles -> `app.css`.
Update structure -> `home/home-page.xml`.
Add Grid + Wrap examples.

e2e/safe-area/app/stacklayout/stacklayout-page.ts

@@ -0,0 +1,8 @@
+import { View, EventData } from "tns-core-modules/ui/core/view";
+
+export function onNavigate(args: EventData) {
+    const view = args.object as View;
+    const route = view["route"];
+
+    view.page.frame.navigate(route);
+}