fix(labor-parts): actually apply modal-heading overrides

Previous commit's translation entries were added but the source change
was silently rejected by the Edit tool's file-not-read guard. Now the
CreateAction/EditAction overrides are in place; RU shows 'Добавить
запчасть по умолчанию' / 'Изменить запчасть по умолчанию' instead of
the auto-generated 'Create Labor Part'.

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

app/Filament/Tenant/Resources/LaborResource/RelationManagers/DefaultPartsRelationManager.php

@@ -54,8 +54,15 @@ class DefaultPartsRelationManager extends RelationManager
                 Tables\Columns\TextColumn::make('qty')->label(__('Cant.'))->alignRight(),
                 Tables\Columns\TextColumn::make('unit')->label(__('UM')),
             ])
-            ->headerActions([Actions\CreateAction::make()])
-            ->actions([Actions\EditAction::make(), Actions\DeleteAction::make()])
+            ->headerActions([
+                Actions\CreateAction::make()
+                    ->label(__('Adaugă piesă'))
+                    ->modalHeading(__('Adaugă piesă implicită')),
+            ])
+            ->actions([
+                Actions\EditAction::make()->modalHeading(__('Editează piesă implicită')),
+                Actions\DeleteAction::make(),
+            ])
             ->emptyStateHeading(__('Nicio piesă implicită'))
             ->emptyStateDescription(__('Adaugă piesele care se montează de obicei la această manoperă — se adaugă automat în fișă când selectezi manopera.'));
     }