feat: implement discount and transport features in the quote system

- Added maximum discount settings configurable by the administrator.
- Implemented discount calculations in the quote confirmation process.
- Introduced transport options with associated costs, including handling for exceeding maximum piece limits.
- Updated frontend to display discounts and transport information in the quote summary.
- Created new database migrations for storing discount and transport settings.
- Developed a new Filament page for managing global discount settings.
- Enhanced email templates to include discount and transport details.
- Added tests to ensure proper functionality of discounts and transport calculations.

backoffice/app/Filament/Resources/PreventivoResource/Pages/ViewPreventivo.php

@@ -5,6 +5,7 @@ namespace App\Filament\Resources\PreventivoResource\Pages;
 use App\Filament\Resources\PreventivoResource;
 use App\Support\PreventivoPdf;
 use Filament\Actions;
+use Filament\Notifications\Notification;
 use Filament\Resources\Pages\ViewRecord;
 use Illuminate\Support\Facades\Storage;
 
@@ -38,6 +39,21 @@ class ViewPreventivo extends ViewRecord
                         'preventivo-'.$this->record->numero.'.pdf'
                     );
                 }),
+            // Il PDF è salvato alla conferma e poi riservito così com'è: dopo modifiche al
+            // template o ai dati va rigenerato.
+            Actions\Action::make('rigeneraPdf')
+                ->label('Rigenera PDF')
+                ->icon('heroicon-o-arrow-path')
+                ->color('gray')
+                ->visible(fn () => $this->record->stato !== 'bozza')
+                ->requiresConfirmation()
+                ->modalDescription('Il PDF verrà ricreato con il modello e i dati attuali, sostituendo quello salvato.')
+                ->action(function () {
+                    $this->record->pdf_path = PreventivoPdf::genera($this->record);
+                    $this->record->save();
+
+                    Notification::make()->title('PDF rigenerato')->success()->send();
+                }),
             Actions\EditAction::make(),
         ];
     }