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>

resources/views/filament/tenant/pdf-preview.blade.php

@@ -0,0 +1,14 @@
+{{-- Reusable PDF preview iframe (loaded inside a Filament action modal).
+     $pdfUrl — inline PDF endpoint (Content-Disposition: inline).
+     $downloadUrl — same URL with ?download=1, shown as a fallback link. --}}
+<div style="display:flex;flex-direction:column;gap:10px;">
+    <div style="display:flex;justify-content:flex-end;gap:8px;">
+        <a href="{{ $downloadUrl }}" class="text-primary-600 hover:underline text-sm font-medium">
+            ⬇️ {{ __('Descarcă') }}
+        </a>
+        <a href="{{ $pdfUrl }}" target="_blank" class="text-primary-600 hover:underline text-sm font-medium">
+            ↗️ {{ __('Deschide în tab nou') }}
+        </a>
+    </div>
+    <iframe src="{{ $pdfUrl }}#toolbar=1&navpanes=0" style="width:100%;height:75vh;border:1px solid var(--fi-color-gray-200,#e5e7eb);border-radius:6px;" title="PDF"></iframe>
+</div>