Enhance error handling and logging in M3U and XML downloading processes; implement proper application shutdown in MainViewModel; introduce PlaylistSettings for configurable URLs and timeout settings.

TV Player/ViewModels/PlaylistSettings.cs

@@ -0,0 +1,43 @@
+namespace TV_Player.MAUI
+{
+    /// <summary>
+    /// Configuration settings for playlist and EPG sources
+    /// </summary>
+    public class PlaylistSettings
+    {
+        /// <summary>
+        /// URL to the M3U playlist file
+        /// </summary>
+        public string M3UUrl { get; set; }
+
+        /// <summary>
+        /// URL to the EPG (Electronic Program Guide) XML file
+        /// Can be overridden by x-tvg-url in M3U file
+        /// </summary>
+        public string EpgUrl { get; set; }
+
+        /// <summary>
+        /// Connection timeout in seconds
+        /// </summary>
+        public int TimeoutSeconds { get; set; } = 30;
+
+        /// <summary>
+        /// Whether to cache EPG data locally
+        /// </summary>
+        public bool CacheEpgLocally { get; set; } = true;
+
+        /// <summary>
+        /// Cache validity period in days
+        /// </summary>
+        public int CacheValidityDays { get; set; } = 3;
+
+        /// <summary>
+        /// Load default settings
+        /// </summary>
+        public static PlaylistSettings Default => new PlaylistSettings
+        {
+            M3UUrl = "http://pl.da-tv.vip/a71e77fa/835b3216/tv.m3u",
+            EpgUrl = string.Empty  // Will be extracted from M3U file
+        };
+    }
+}