feat: add mobile IPTV playlist management screen with auto-login functionality

lib/core/theme/app_colors.dart

@@ -36,13 +36,13 @@ class AppColors {
     end: Alignment.bottomRight,
   );
 
-  /// Apple TV Style Background Gradient (Grey/Black Radial)
+  /// Apple TV Style Background Gradient (Lighter Grey for categories)
   static const RadialGradient appleTvGradient = RadialGradient(
     center: Alignment.center,
-    radius: 1.5,
+    radius: 2.0,
     colors: [
-      Color(0xFF2C2C2E), // Apple Dark Gray
-      Color(0xFF000000), // Black
+      Color(0xFF3A3A3C), // Lighter Apple Gray
+      Color(0xFF1C1C1E), // Dark Gray (not pure black)
     ],
     stops: [0.0, 1.0],
   );

lib/mobile/features/iptv/screens/mobile_playlist_screen.dart

@@ -28,6 +28,23 @@ class _MobilePlaylistScreenState extends ConsumerState<MobilePlaylistScreen> {
   void initState() {
     super.initState();
     _playlistService.init();
+    
+    // Auto-login: if playlists exist, navigate to first one automatically
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      _checkAutoLogin();
+    });
+  }
+
+  Future<void> _checkAutoLogin() async {
+    try {
+      final playlists = await _playlistService.getPlaylists();
+      if (playlists.isNotEmpty && mounted) {
+        // Navigate to first playlist automatically
+        _navigateToDashboard(playlists.first);
+      }
+    } catch (e) {
+      debugPrint('Auto-login check failed: $e');
+    }
   }
 
   void _refreshPlaylists() {