Update guest v2 branding and theming

resources/js/guest-v2/__tests__/PhotoLightboxScreen.test.tsx

@@ -32,8 +32,12 @@ vi.mock('../components/SurfaceCard', () => ({
   default: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
 }));
 
+vi.mock('../components/ShareSheet', () => ({
+  default: () => <div>ShareSheet</div>,
+}));
+
 vi.mock('../context/EventDataContext', () => ({
-  useEventData: () => ({ token: 'token' }),
+  useEventData: () => ({ token: 'token', event: { name: 'Demo Event' } }),
 }));
 
 vi.mock('../services/photosApi', () => ({