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/core/theme_manager.dart

@@ -10,9 +10,15 @@ class ThemeManager {
 
   /// Call during app startup to load saved preference.
   static Future<void> init() async {
-    final prefs = await SharedPreferences.getInstance();
-    final isDark = prefs.getBool(_prefKey) ?? false;
-    themeMode.value = isDark ? ThemeMode.dark : ThemeMode.light;
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      final isDark = prefs.getBool(_prefKey) ?? false;
+      themeMode.value = isDark ? ThemeMode.dark : ThemeMode.light;
+    } catch (e) {
+      // If SharedPreferences fails, default to light theme
+      print('Error initializing theme: $e');
+      themeMode.value = ThemeMode.light;
+    }
   }
 
   /// Set theme and persist