fix(tv): use channel key for tuning and EPG matching

lib/models/livetv_channel.dart

@@ -40,7 +40,7 @@ class LiveTvChannel {
       title: json['title'] as String? ?? json['callSign'] as String?,
       thumb: json['thumb'] as String?,
       art: json['art'] as String?,
-      number: json['number'] as String? ?? json['channelNumber'] as String?,
+      number: json['number'] as String? ?? json['channelNumber'] as String? ?? json['channelVcn']?.toString(),
       hd: json['hd'] == true || json['hd'] == 1,
       lineup: json['lineup'] as String?,
       slug: json['slug'] as String?,

lib/screens/livetv/live_tv_screen.dart

@@ -118,12 +118,8 @@ class _LiveTvScreenState extends State<LiveTvScreen> with SingleTickerProviderSt
 
           final channels = await client.getEpgChannels(lineup: serverInfo.lineup);
           appLogger.d('Channels from DVR ${serverInfo.dvrKey}: ${channels.length} channels');
-          if (channels.isNotEmpty) {
-            final sample = channels.first;
-            appLogger.d('Sample channel: key=${sample.key} identifier=${sample.identifier} number=${sample.number} slug=${sample.slug}');
-          }
           for (final channel in channels) {
-            final dedupKey = '${serverInfo.serverId}:${channel.identifier ?? channel.key}';
+            final dedupKey = '${serverInfo.serverId}:${channel.key}';
             if (seenChannels.add(dedupKey)) {
               allChannels.add(channel);
             }

lib/screens/livetv/tabs/guide_tab.dart

@@ -258,8 +258,7 @@ class GuideTabState extends State<GuideTab> {
   }
 
   List<LiveTvProgram> _getProgramsForChannel(LiveTvChannel channel) {
-    final channelId = channel.identifier ?? channel.key;
-    return _programs.where((p) => p.channelIdentifier == channelId).toList()
+    return _programs.where((p) => p.channelIdentifier == channel.key).toList()
       ..sort((a, b) => (a.beginsAt ?? 0).compareTo(b.beginsAt ?? 0));
   }
 

lib/screens/video_player_screen.dart

@@ -867,10 +867,9 @@ class VideoPlayerScreenState extends State<VideoPlayerScreen> with WidgetsBindin
             throw Exception('No channel to tune');
           }
           final channel = channels[channelIndex];
-          final channelId = channel.identifier ?? channel.key;
-          appLogger.d('Tune: dvrKey=${widget.liveDvrKey} channelId=$channelId (identifier=${channel.identifier}, key=${channel.key})');
+          appLogger.d('Tune: dvrKey=${widget.liveDvrKey} channelKey=${channel.key}');
           final client = widget.liveClient!;
-          final result = await client.tuneChannel(widget.liveDvrKey!, channelId);
+          final result = await client.tuneChannel(widget.liveDvrKey!, channel.key);
           if (result == null) throw Exception('Failed to tune channel');
 
           streamUrl = '${client.config.baseUrl}${result.streamPath}'
@@ -1722,8 +1721,7 @@ class VideoPlayerScreenState extends State<VideoPlayerScreen> with WidgetsBindin
     await _sendLiveTimeline('stopped');
 
     final channel = channels[newIndex];
-    final channelId = channel.identifier ?? channel.key;
-    appLogger.d('Switching to channel: ${channel.displayName} ($channelId) (identifier=${channel.identifier}, key=${channel.key})');
+    appLogger.d('Switching to channel: ${channel.displayName} (${channel.key})');
 
     setState(() => _hasFirstFrame.value = false);
 
@@ -1739,7 +1737,7 @@ class VideoPlayerScreenState extends State<VideoPlayerScreen> with WidgetsBindin
       final client = multiServer.getClientForServer(serverInfo.serverId);
       if (client == null) return;
 
-      final result = await client.tuneChannel(serverInfo.dvrKey, channelId);
+      final result = await client.tuneChannel(serverInfo.dvrKey, channel.key);
       if (result == null || !mounted) return;
 
       final streamUrl = '${client.config.baseUrl}${result.streamPath}'.withPlexToken(client.config.token);

lib/utils/live_tv_player_navigation.dart

@@ -21,14 +21,13 @@ Future<void> navigateToLiveTv(
   required LiveTvChannel channel,
   List<LiveTvChannel>? channels,
 }) async {
-  final channelId = channel.identifier ?? channel.key;
   final navigator = Navigator.of(context);
 
-  appLogger.d('Navigating to live channel: ${channel.displayName} ($channelId)');
+  appLogger.d('Navigating to live channel: ${channel.displayName} (${channel.key})');
 
   final placeholder = PlexMetadata(
-    ratingKey: channelId,
-    key: channelId,
+    ratingKey: channel.key,
+    key: channel.key,
     type: 'clip',
     title: channel.displayName,
   );
@@ -42,7 +41,7 @@ Future<void> navigateToLiveTv(
       liveStreamUrl: null,
       liveChannels: channels,
       liveCurrentChannelIndex: channels?.indexWhere(
-        (ch) => (ch.identifier ?? ch.key) == channelId,
+        (ch) => ch.key == channel.key,
       ),
       liveDvrKey: dvrKey,
       liveClient: client,