Refactor Staff and Store models to use fromMap method; enhance StoreCubit with provider management functionality

lib/features/master_data/staff/models/staff_member_model.dart

@@ -18,20 +18,20 @@ class StaffMemberModel extends Equatable {
     required this.companyId,
   });
 
-  factory StaffMemberModel.fromJson(Map<String, dynamic> json) {
+  factory StaffMemberModel.fromMap(Map<String, dynamic> map) {
     return StaffMemberModel(
-      id: json['id'],
+      id: map['id'],
       // Applichiamo il tuo myFormat per visualizzare i nomi correttamente
-      name: (json['name'] as String).myFormat(),
+      name: (map['name'] as String).myFormat(),
       // L'email la teniamo lowercase per standard tecnico
-      email: (json['email'] as String? ?? '').toLowerCase().trim(),
-      phone: (json['phone'] as String? ?? '').trim(),
-      isActive: json['is_active'] ?? true,
-      companyId: json['company_id'],
+      email: (map['email'] as String? ?? '').toLowerCase().trim(),
+      phone: (map['phone'] as String? ?? '').trim(),
+      isActive: map['is_active'] ?? true,
+      companyId: map['company_id'],
     );
   }
 
-  Map<String, dynamic> toJson() {
+  Map<String, dynamic> toMap() {
     return {
       if (id != null) 'id': id,
       'name': name.toLowerCase().trim(), // Salviamo pulito per le query