feat: add IPTV data models and application color palette

lib/core/models/iptv_models.dart

@@ -159,15 +159,25 @@ class EpgEntry {
     return EpgEntry(
       id: json['id']?.toString() ?? '',
       epgId: json['epg_id']?.toString() ?? '',
-      title: json['title']?.toString() ?? '',
+      title: _decodeBase64(json['title']?.toString()),
       lang: json['lang']?.toString() ?? '',
       start: json['start']?.toString() ?? '',
       end: json['end']?.toString() ?? '',
-      description: json['description']?.toString() ?? '',
+      description: _decodeBase64(json['description']?.toString()),
       channelId: json['channel_id']?.toString() ?? '',
     );
   }
 
+  static String _decodeBase64(String? text) {
+    if (text == null || text.isEmpty) return '';
+    try {
+      final bytes = base64Decode(text);
+      return utf8.decode(bytes, allowMalformed: true);
+    } catch (_) {
+      return text;
+    }
+  }
+
   /// Calculate progress percentage for current program
   double getProgress() {
     try {

lib/core/theme/app_colors.dart

@@ -15,10 +15,10 @@ class AppColors {
   static const Color background = Color(0xFF000000);
   
   /// Very deep grey for surfaces that need to be distinct but subtle (Apple Dark Grey)
-  static const Color surface = Color(0xFF1C1C1E);
+  static const Color surface = Color(0xFF2C2C2E);
   
   /// Slightly lighter grey for secondary surfaces or hover states
-  static const Color surfaceVariant = Color(0xFF2C2C2E);
+  static const Color surfaceVariant = Color(0xFF3A3A3C);
   
   /// Focused element background (often white in tvOS for text, or bright accent)
   static const Color focusColor = Color(0xFFFFFFFF);