feat: Add toast notifications to all wizards

- Imported showToast utility from react-hot-toast wrapper
- Added success toast after successful API calls in all 7 wizards
- Added error toast on API failures for better user feedback
- Replaced silent errors with user-visible toast notifications

Wizards updated:
- CustomerWizard: Toast on customer creation
- EquipmentWizard: Toast on equipment creation
- QualityTemplateWizard: Toast on template creation
- SupplierWizard: Toast on supplier + price list creation
- RecipeWizard: Toast on recipe creation
- SalesEntryWizard: Toast on sales record creation
- CustomerOrderWizard: Toast on customer + order creation

This completes the toast notification implementation (High Priority item).
Users now get immediate visual feedback on success/failure instead of
relying on console.log or error state alone.

frontend/src/components/domain/unified-wizard/wizards/SupplierWizard.tsx

@@ -4,6 +4,7 @@ import { Building2, Package, Euro, CheckCircle2, Phone, Mail, Loader2, AlertCirc
 import { useTenant } from '../../../../stores/tenant.store';
 import { suppliersService } from '../../../../api/services/suppliers';
 import { inventoryService } from '../../../../api/services/inventory';
+import { showToast } from '../../../../utils/toast';
 
 interface WizardDataProps extends WizardStepProps {
   data: Record<string, any>;
@@ -260,11 +261,14 @@ const ProductsPricingStep: React.FC<WizardDataProps> = ({ data, onDataChange, on
         });
       }
 
+      showToast.success('Proveedor creado exitosamente');
       onDataChange({ ...data, products });
       onComplete();
     } catch (err: any) {
       console.error('Error saving supplier:', err);
-      setError(err.response?.data?.detail || 'Error al guardar el proveedor');
+      const errorMessage = err.response?.data?.detail || 'Error al guardar el proveedor';
+      setError(errorMessage);
+      showToast.error(errorMessage);
     } finally {
       setSaving(false);
     }