i18n(wo relations): translated snapshot names + explicit empty states

- WorksRelationManager Name column: getStateUsing(labor?->label()) so
  the row shows the labor's localized name (not the raw snapshot);
  fallback to stored snapshot when labor is missing.
- 4 explicit empty states with helper description + icon on Works,
  Parts, SubcontractJobs, Payments — replaces Filament's auto-generated
  'Не найдено X / Создать X для старта.'
- 4 CreateAction titles / modal headings for all four relation managers.
- Notification 'Piesa returnată în stoc' / 'Nimic de restituit' wrapped.
- +11 translation keys.

All 306 tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/Filament/Tenant/Resources/WorkOrderResource/RelationManagers/PartsRelationManager.php

@@ -87,7 +87,9 @@ class PartsRelationManager extends RelationManager
                     ]),
             ])
             ->headerActions([
-                Actions\CreateAction::make(),
+                Actions\CreateAction::make()
+                    ->label(__('Adaugă piesă'))
+                    ->modalHeading(__('Adaugă piesă în fișă')),
             ])
             ->actions([
                 Actions\Action::make('smart_price')
@@ -154,12 +156,15 @@ class PartsRelationManager extends RelationManager
                             $r, (float) $data['qty'], $data['notes'] ?? null
                         );
                         Notification::make()
-                            ->title($batch ? 'Piesa returnată în stoc' : 'Nimic de restituit')
+                            ->title($batch ? __('Piesa returnată în stoc') : __('Nimic de restituit'))
                             ->{$batch ? 'success' : 'warning'}()
                             ->send();
                     }),
                 Actions\EditAction::make(),
                 Actions\DeleteAction::make(),
-            ]);
+            ])
+            ->emptyStateHeading(__('Nicio piesă montată.'))
+            ->emptyStateDescription(__('Adaugă piesele necesare din catalog. Stocul se rezervă automat, iar la marcarea „Montată" scade FIFO.'))
+            ->emptyStateIcon('heroicon-o-cube');
     }
 }