fix: exclude video calls from Call Pull list (WT-1618)

Pulling a video call offers an audio-only INVITE; the server answer keeps the
original video m-line, the offer/answer m-line layout no longer matches and
setRemoteDescription rejects it, so the pulled call fails.

Thread a nullable has_video flag from the signaling dialog_info through the model
and the drift store, and exclude known-video dialogs from the pull list
(DialogInfo.pullable). The flag is nullable: until the backend reports media type
it stays null and behaviour is unchanged (audio pull keeps working); once the
backend sends has_video=true for video dialogs they drop out of the list
automatically, with no further client change.

- SignalingDialogInfo: parse/serialize has_video
- DialogInfo: hasVideo field + pullable gate
- app_database: dialog_info.has_video column + schema migration v24
- tests: signaling parsing, pullable gate

Author: SERDUN

lib/mappers/drift/dialog_info_drift_mapper.dart

@@ -17,6 +17,7 @@ mixin DialogInfoDriftMapper {
       remoteDisplayName: data.remoteDisplayName,
       arrivalVersion: data.arrivalVersion,
       arrivalTime: DateTime.fromMicrosecondsSinceEpoch(data.arrivalTimeUsec),
+      hasVideo: data.hasVideo,
     );
   }
 
@@ -35,6 +36,7 @@ mixin DialogInfoDriftMapper {
       remoteDisplayName: info.remoteDisplayName,
       arrivalVersion: info.arrivalVersion,
       arrivalTimeUsec: info.arrivalTime.microsecondsSinceEpoch,
+      hasVideo: info.hasVideo,
     );
   }
 }

lib/mappers/signaling/dialog_info_mapper.dart

@@ -18,6 +18,7 @@ class SignalingDialogInfoMapper {
       remoteDisplayName: data.remoteDisplayName,
       arrivalVersion: data.arrivalVersion,
       arrivalTime: data.arrivalTime,
+      hasVideo: data.hasVideo,
     );
   }
 }

lib/models/dialog_info.dart

@@ -19,6 +19,7 @@ class DialogInfo extends Equatable {
     required this.remoteDisplayName,
     required this.arrivalVersion,
     required this.arrivalTime,
+    this.hasVideo,
   });
 
   final String id;
@@ -35,11 +36,19 @@ class DialogInfo extends Equatable {
   final String arrivalVersion;
   final DateTime arrivalTime;
 
+  /// Whether the dialog currently has an active video stream. Null when the
+  /// backend does not report media type yet (treated as unknown, not audio).
+  final bool? hasVideo;
+
   String? get displayName => remoteDisplayName ?? remoteNumber;
 
   bool get pullable {
     if (state != DialogState.confirmed) return false;
     if (remoteNumber == null || callId == null || localTag == null || remoteTag == null) return false;
+    // Pulling a video call offers audio-only and crashes on the answer's video
+    // m-line, so exclude known-video dialogs. Null (unknown) stays pullable to
+    // preserve current behaviour until the backend reports media type.
+    if (hasVideo == true) return false;
     return true;
   }
 
@@ -58,10 +67,11 @@ class DialogInfo extends Equatable {
     remoteDisplayName,
     arrivalVersion,
     arrivalTime,
+    hasVideo,
   ];
 
   @override
   String toString() {
-    return 'DialogInfo{id: $id, entityNumber: $entityNumber, state: $state, callId: $callId, direction: $direction, localTag: $localTag, localNumber: $localNumber, localDisplayName: $localDisplayName, remoteTag: $remoteTag, remoteNumber: $remoteNumber, remoteDisplayName: $remoteDisplayName, arrivalVersion: $arrivalVersion, arrivalTime: $arrivalTime}';
+    return 'DialogInfo{id: $id, entityNumber: $entityNumber, state: $state, callId: $callId, direction: $direction, localTag: $localTag, localNumber: $localNumber, localDisplayName: $localDisplayName, remoteTag: $remoteTag, remoteNumber: $remoteNumber, remoteDisplayName: $remoteDisplayName, arrivalVersion: $arrivalVersion, arrivalTime: $arrivalTime, hasVideo: $hasVideo}';
   }
 }