feat: Implement Playlists and Programs Management

- Added PlaylistsGroupViewModel to manage playlists and selection.
- Introduced ProgramsGroupViewModel for handling program groups and subscriptions.
- Created ProgramsListViewModel to manage individual program listings.
- Developed SettingsViewModel for user settings including playlist management.
- Implemented TVPlayerViewModel as the main view model coordinating screens and data.
- Added PlayerView for video playback with LibVLC integration.
- Created XAML views for PlaylistsGroup, ProgramsGroup, ProgramsList, and Settings.
- Added sample M3U playlist for testing.
- Documented WPF build instructions and project structure in WPF-BUILD.md.
- Configured global.json for .NET SDK versioning.

TV Player WPF/ViewModels/ProgramsData.cs

@@ -21,17 +21,33 @@ namespace TV_Player
 
         private async Task GetPrograms(string name,string m3uLink)
         {
+            System.Diagnostics.Debug.WriteLine($"[ProgramsData] Starting download of: {m3uLink}");
             //string m3uLink = "http://pl.da-tv.vip/a71e77fa/835b3216/tv.m3u";
-            var result = await M3UParser.DownloadM3UFromWebAsync(m3uLink);
+            try
+            {
+                var result = await M3UParser.DownloadM3UFromWebAsync(m3uLink);
+                System.Diagnostics.Debug.WriteLine($"[ProgramsData] Downloaded {result.programList.Count} programs");
 
-            programsSubject.OnNext(result.programList);
+                programsSubject.OnNext(result.programList);
 
-            var groupping = result.programList.GroupBy(item => item.GroupTitle)
-                               .Select(group => new GroupInfo() { Name = group.Key, Count = group.Count() })
-                               .ToList();
-            groupsSubject.OnNext(groupping);
-
-            await Task.Run(() => GetProgramGuide(name,result.programGuide));
+                var groupping = result.programList.GroupBy(item => item.GroupTitle)
+                                   .Select(group => new GroupInfo() { Name = group.Key, Count = group.Count() })
+                                   .OrderBy(g => g.Name)
+                                   .ToList();
+                System.Diagnostics.Debug.WriteLine($"[ProgramsData] Publishing {groupping.Count} groups: {string.Join(", ", groupping.Select(g => $"{g.Name}({g.Count})"))}");
+                if (groupping.Count == 0)
+                {
+                    System.Diagnostics.Debug.WriteLine("[ProgramsData] WARNING: No groups found! Check if programs have 'group-title' metadata.");
+                }
+                groupsSubject.OnNext(groupping);
+                
+                await Task.Run(() => GetProgramGuide(name, result.programGuide));
+            }
+            catch (Exception ex)
+            {
+                System.Diagnostics.Debug.WriteLine($"[ProgramsData] ERROR downloading programs: {ex.Message}");
+                throw;
+            }
         }
 
         public Task<ProgramGuide> GetGuideByProgram(string channelID)

TV Player WPF/ViewModels/SettingsModel.cs

@@ -5,9 +5,26 @@ namespace TV_Player.ViewModels
 {
     public static class SettingsModel
     {
-        private static readonly string AppDataFolder = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData), "TVPlayer");
+        private static readonly string AppDataFolder = Path.Combine(GetWritableAppDataFolder(), "TVPlayer");
         private static readonly string SettingsFilePath = Path.Combine(AppDataFolder, "settings.json");
 
+        private static string GetWritableAppDataFolder()
+        {
+            var localAppData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+            if (!string.IsNullOrWhiteSpace(localAppData))
+            {
+                return localAppData;
+            }
+
+            var appData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+            if (!string.IsNullOrWhiteSpace(appData))
+            {
+                return appData;
+            }
+
+            return AppContext.BaseDirectory;
+        }
+
         public static Dictionary<string,string> Playlists { get; set; }
         public static bool StartFullScreen { get; set; } 
         public static bool StartFromLastScreen { get; set; }