feat(pdf): preview in Filament modal (iframe) instead of new tab

All "Vizualizare PDF" actions now open a wide (7xl) Filament modal
containing an iframe pointing at the inline PDF endpoint, with a
top-right "Descarcă" and "Deschide în tab nou" fallback.

- WorkOrder edit action + WO table row action
- InjectorProtocol edit action + protocols table row action
- Dashboard Docs tab preview button (Alpine.js overlay since it's
  a plain Blade view, not a Filament action)

The underlying /pdf routes stay unchanged (Content-Disposition: inline,
?download=1 for attachment) — the iframe just loads the same URL.

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

app/Filament/Tenant/Resources/WorkOrderResource.php

@@ -188,8 +188,14 @@ class WorkOrderResource extends Resource
                     ->label(__('PDF'))
                     ->icon('heroicon-m-document-magnifying-glass')
                     ->color('gray')
-                    ->url(fn (WorkOrder $r) => url('/app/work-orders/' . $r->id . '/pdf'))
-                    ->openUrlInNewTab(),
+                    ->modalHeading(fn (WorkOrder $r) => __('Factură') . ' — WO #' . $r->number)
+                    ->modalSubmitAction(false)
+                    ->modalCancelActionLabel(__('Închide'))
+                    ->modalWidth('7xl')
+                    ->modalContent(fn (WorkOrder $r) => view('filament.tenant.pdf-preview', [
+                        'pdfUrl' => url('/app/work-orders/' . $r->id . '/pdf'),
+                        'downloadUrl' => url('/app/work-orders/' . $r->id . '/pdf?download=1'),
+                    ])),
                 Actions\EditAction::make(),
                 Actions\DeleteAction::make(),
             ])