feat: add comprehensive logging for downloads debugging

Added extensive logging throughout DownloadsProvider and DownloadsScreen
to diagnose why downloads screen appears empty.

DownloadsProvider.refreshDownloads():
- 📥 Log function call
- 📥 Log state changes (loading, error)
- 📥 Log TorrentPlatformService.getAllDownloads() call
- 📥 Log number of torrents received
- 📥 Log each torrent processing with index
- 📥 Log success/failure for each torrent info fetch
- 📥 Log final torrents count
- 📥 Log completion or error state

DownloadsScreen.initState() and Consumer:
- 📥 Log initState call
- 📥 Log postFrameCallback execution
- 📥 Log Consumer builder invocations
- 📥 Log provider state (isLoading, error, torrents.length)
- 📥 Log which UI is displayed:
  * CircularProgressIndicator
  * ErrorDisplay
  * Empty state message
  * Torrent list with count

All logs prefixed with 📥 for easy filtering in logcat.

Example output:
---
📥 DownloadsScreen: initState() called
📥 DownloadsScreen: postFrameCallback, calling refreshDownloads()
📥 DownloadsProvider: refreshDownloads() called
📥 Setting loading=true, error=null
📥 Calling TorrentPlatformService.getAllDownloads()...
📥 Got 0 torrents from platform service
📥 Cleared _torrents list
📥 Final torrents count: 0
📥 Setting loading=false
📥 ✅ refreshDownloads() completed successfully
📥 DownloadsScreen: Consumer builder called
📥   isLoading: false
📥   error: null
📥   torrents.length: 0
📥   → Showing empty state

This will help identify:
- Is refreshDownloads being called?
- Does TorrentPlatformService return any data?
- Are torrents parsed correctly?
- Is the correct UI state shown?
- Where does the process fail?

Usage:
Run app → Open Downloads screen → Check logcat for 📥 logs

lib/presentation/providers/downloads_provider.dart

@@ -36,15 +36,23 @@ class DownloadsProvider with ChangeNotifier {
 
   /// Загрузить список активных загрузок
   Future<void> refreshDownloads() async {
+    print('📥 DownloadsProvider: refreshDownloads() called');
     try {
+      print('📥 Setting loading=true, error=null');
       _setLoading(true);
       _setError(null);
       
+      print('📥 Calling TorrentPlatformService.getAllDownloads()...');
       final progress = await TorrentPlatformService.getAllDownloads();
+      print('📥 Got ${progress.length} torrents from platform service');
       
       // Получаем полную информацию о каждом торренте
       _torrents.clear();
-      for (final progressItem in progress) {
+      print('📥 Cleared _torrents list');
+      
+      for (int i = 0; i < progress.length; i++) {
+        final progressItem = progress[i];
+        print('📥 Processing torrent $i: ${progressItem.infoHash.substring(0, 8)}...');
         try {
           final torrentInfo = await TorrentPlatformService.getTorrent(progressItem.infoHash);
           if (torrentInfo != null) {
@@ -64,14 +72,22 @@ class DownloadsProvider with ChangeNotifier {
             state: progressItem.state,
             savePath: '/storage/emulated/0/Download/NeoMovies',
             files: [],
-          ));
+          );
+          print('📥   ✅ Created basic info: ${basicInfo.name}');
+          _torrents.add(basicInfo);
         }
       }
       
+      print('📥 Final torrents count: ${_torrents.length}');
+      print('📥 Setting loading=false');
       _setLoading(false);
-    } catch (e) {
+      print('📥 ✅ refreshDownloads() completed successfully');
-      _setError(e.toString());
+    } catch (e, stackTrace) {
+      print('📥 ❌ Error refreshing downloads: $e');
+      print('📥 Stack trace: $stackTrace');
+      _setError(e.toString(), stackTrace.toString());
       _setLoading(false);
+      print('📥 Error state set, loading=false');
     }
   }
 

lib/presentation/screens/downloads/downloads_screen.dart

@@ -40,13 +40,20 @@ class _DownloadsScreenState extends State<DownloadsScreen> {
       ),
       body: Consumer<DownloadsProvider>(
         builder: (context, provider, child) {
+          print('📥 DownloadsScreen: Consumer builder called');
+          print('📥   isLoading: ${provider.isLoading}');
+          print('📥   error: ${provider.error}');
+          print('📥   torrents.length: ${provider.torrents.length}');
+          
           if (provider.isLoading) {
+            print('📥   → Showing CircularProgressIndicator');
             return const Center(
               child: CircularProgressIndicator(),
             );
           }
 
           if (provider.error != null) {
+            print('📥   → Showing ErrorDisplay');
             return ErrorDisplay(
               title: 'Ошибка загрузки торрентов',
               error: provider.error!,
@@ -58,6 +65,7 @@ class _DownloadsScreenState extends State<DownloadsScreen> {
           }
 
           if (provider.torrents.isEmpty) {
+            print('📥   → Showing empty state');
             return Center(
               child: Column(
                 mainAxisAlignment: MainAxisAlignment.center,
@@ -87,6 +95,7 @@ class _DownloadsScreenState extends State<DownloadsScreen> {
             );
           }
 
+          print('📥   → Showing ${provider.torrents.length} torrents in list');
           return RefreshIndicator(
             onRefresh: () async {
               await provider.refreshDownloads();