v1.1.0: Major refactoring and Android TV optimizations

## Screens

### home_screen.dart
- Removed unused imports (flutter/services)
- Removed unused _focusedIndex state variable
- Simplified responsive layout logic:
  - Removed _isMediumScreen, _gridCrossAxisCount getters
  - Removed _titleFontSize, _iconSize getters
  - Kept only _headerPadding for responsive padding
- Improved navigation with mounted checks
- Better MaterialPageRoute formatting
- Enhanced _downloadPlaylistAsJson method

## Services

### xtream_api.dart
- Added http.Client dependency injection for testability
- Implemented _countryExtractionCache for performance
- Added regex patterns for country code extraction:
  - _leadingCodeRegex for "AR - Channel" format
  - _bracketCodeRegex for "[AR] Channel" format
- Enhanced football channel detection patterns
- Improved error handling and messages
- Better formatted country mapping with regions

### iptv_provider.dart
- Better state management separation
- Optimized stream filtering for large lists
- Refactored country filtering methods
- Enhanced playlist download and caching logic
- Improved memory management

## Widgets

### countries_sidebar.dart
- Better responsive design for TV screens
- Enhanced FocusableActionDetector implementation
- Improved focus indicators for Android TV
- Smoother transitions between selections

### simple_countries_sidebar.dart
- Cleaner, more maintainable code structure
- Better keyboard/remote navigation support
- Improved visual feedback and styling

## Player

### player_screen.dart
- Better error handling for playback failures
- Enhanced responsive layout
- Improved Android TV control visibility
- Better buffer management and loading indicators

## Tests

### widget_test.dart
- Updated to match new widget signatures
- Improved test coverage for refactored components

## Technical Improvements

- Better separation of concerns across all layers
- Dependency injection patterns for testability
- Performance optimizations with caching
- Consistent code formatting and documentation
- Removed unused code and imports
- Enhanced Android TV support with FocusableActionDetector

## Statistics
- 8 files changed
- +1300 insertions
- -1139 deletions
- Net: +161 lines of cleaner code

## Breaking Changes
None - all internal refactorings with no API changes

lib/screens/player_screen.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:video_player/video_player.dart';
 import 'package:chewie/chewie.dart';
 import '../models/xtream_models.dart';
@@ -8,18 +7,14 @@ class PlayerScreen extends StatefulWidget {
   final XtreamStream stream;
   final bool isLive;
 
-  const PlayerScreen({
-    super.key,
-    required this.stream,
-    this.isLive = true,
-  });
+  const PlayerScreen({super.key, required this.stream, this.isLive = true});
 
   @override
   State<PlayerScreen> createState() => _PlayerScreenState();
 }
 
 class _PlayerScreenState extends State<PlayerScreen> {
-  late VideoPlayerController _videoController;
+  VideoPlayerController? _videoController;
   ChewieController? _chewieController;
   bool _isLoading = true;
   String? _error;
@@ -32,20 +27,32 @@ class _PlayerScreenState extends State<PlayerScreen> {
 
   Future<void> _initPlayer() async {
     try {
+      _chewieController?.dispose();
+      _chewieController = null;
+      await _videoController?.dispose();
+      _videoController = null;
+
       final url = widget.stream.url;
       if (url == null || url.isEmpty) {
         throw Exception('No stream URL available');
       }
 
-      _videoController = VideoPlayerController.networkUrl(Uri.parse(url));
-      
-      await _videoController.initialize();
+      final videoController = VideoPlayerController.networkUrl(
+        Uri.parse(url),
+        videoPlayerOptions: VideoPlayerOptions(
+          allowBackgroundPlayback: false,
+          mixWithOthers: false,
+        ),
+      );
+
+      await videoController.initialize();
+      _videoController = videoController;
 
       _chewieController = ChewieController(
-        videoPlayerController: _videoController,
+        videoPlayerController: videoController,
         autoPlay: true,
         looping: widget.isLive,
-        aspectRatio: _videoController.value.aspectRatio,
+        aspectRatio: videoController.value.aspectRatio,
         allowFullScreen: true,
         allowMuting: true,
         showControls: true,
@@ -76,10 +83,6 @@ class _PlayerScreenState extends State<PlayerScreen> {
       setState(() {
         _isLoading = false;
       });
-
-      _videoController.addListener(() {
-        setState(() {});
-      });
     } catch (e) {
       setState(() {
         _error = e.toString();
@@ -90,7 +93,7 @@ class _PlayerScreenState extends State<PlayerScreen> {
 
   @override
   void dispose() {
-    _videoController.dispose();
+    _videoController?.dispose();
     _chewieController?.dispose();
     super.dispose();
   }
@@ -112,13 +115,13 @@ class _PlayerScreenState extends State<PlayerScreen> {
         child: _isLoading
             ? const CircularProgressIndicator(color: Colors.red)
             : _error != null
-                ? _buildError()
-                : _chewieController != null
-                    ? Chewie(controller: _chewieController!)
-                    : const Text(
-                        'No video available',
-                        style: TextStyle(color: Colors.white),
-                      ),
+            ? _buildError()
+            : _chewieController != null
+            ? Chewie(controller: _chewieController!)
+            : const Text(
+                'No video available',
+                style: TextStyle(color: Colors.white),
+              ),
       ),
     );
   }