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>

lang/en.json

@@ -670,6 +670,7 @@
     "Deschide fișă nouă": "Open new order",
     "Deschide panoul pe telefon și acceptă notificările întâi.": "Open the panel on the phone and accept notifications first.",
     "Deschide tenantul": "Deschide tenantul",
+    "Deschide în tab nou": "Open in new tab",
     "Deschide →": "Open →",
     "Deschidere ÎNAINTE": "Opening BEFORE",
     "Deschis": "Opened",
@@ -1623,6 +1624,7 @@
     "Progres": "Progress",
     "Progres etapă": "Stage progress",
     "Proprietar": "Owner",
+    "Protocol": "Protocol",
     "Protocol nou": "New protocol",
     "Provider implicit": "Default provider",
     "Provider:": "Provider:",