feat: update login, event detail, theme, and API client

- Improved event detail page with carousel, map, and layout fixes
- Updated login screen with video background and glassmorphism
- API client development mode with mock responses
- Theme manager and main app updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/screens/desktop_login_screen.dart

@@ -237,8 +237,8 @@ class _DesktopLoginScreenState extends State<DesktopLoginScreen> with SingleTick
                                       ),
                                     ),
                                     const SizedBox(height: 12),
-                                    Row(
-                                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                                    Wrap(
+                                      alignment: WrapAlignment.spaceBetween,
                                       children: [
                                         TextButton(onPressed: _openRegister, child: const Text("Don't have an account? Register")),
                                         TextButton(onPressed: () {}, child: const Text('Contact support'))