fix operations e tasks

lib/features/operations/models/operation_model.dart

@@ -30,7 +30,6 @@ class OperationModel extends Equatable {
   final DateTime? createdAt;
   final String type;
   final String? subType;
-  final String? providerId;
   final String? modelId;
   final String? modelDisplayName;
   final String? description;
@@ -60,7 +59,6 @@ class OperationModel extends Equatable {
     this.createdAt,
     this.type = '',
     this.subType,
-    this.providerId,
     this.modelId,
     this.modelDisplayName,
     this.description,
@@ -90,7 +88,6 @@ class OperationModel extends Equatable {
     String? type,
     String? subType,
     // 🥷 TRUCCO APPLICATO ANCHE QUI:
-    String? Function()? providerId,
     ProviderModel? Function()? provider,
     String? modelId,
     String? modelDisplayName,
@@ -118,7 +115,6 @@ class OperationModel extends Equatable {
     type: type ?? this.type,
     subType: subType ?? this.subType,
     // Se la funzione è passata, la eseguiamo (anche se ritorna null), altrimenti teniamo il vecchio
-    providerId: providerId != null ? providerId() : this.providerId,
     provider: provider != null ? provider() : this.provider,
 
     modelId: modelId ?? this.modelId,
@@ -149,7 +145,6 @@ class OperationModel extends Equatable {
     createdAt,
     type,
     subType,
-    providerId,
     provider,
     modelId,
     modelDisplayName,
@@ -187,8 +182,6 @@ class OperationModel extends Equatable {
       subType: map['sub_type'] as String?,
 
       // I campi relazionali nullabili restano rigorosamente null!
-      providerId: map['provider_id'] as String?,
-      // MAGIA ANTI-CRASH: Usiamo ?['chiave'] per non far esplodere i join vuoti
       provider: (map[Tables.providers] != null)
           ? ProviderModel.fromMap(map[Tables.providers] as Map<String, dynamic>)
           : null,
@@ -243,7 +236,7 @@ class OperationModel extends Equatable {
       if (id != null) 'id': id,
       'type': type,
       'sub_type': subType,
-      'provider_id': providerId,
+      'provider_id': provider?.id,
       'model_id': modelId,
       'description': description,
       if (expirationDate != null)