ui: place offline SVG button directly beside "SVG herunterladen"

NetBox renders the native download link inside each per-face
elevation card, not through a plugin buttons() extension point, so
there's no server-side hook to inject a matching link next to it. The
right_page() extension now emits only a script (no separate sidebar
panel) that finds every a[href*="render=svg"] link, reads its face=
param, and inserts a matching "SVG offline" button right after it. The
button's href stays in sync with the rack-view select the same way
the previous panel's links did.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

netbox_utilities/template_content.py

@@ -156,6 +156,10 @@ class RackUtilitiesContent(PluginTemplateExtension):
     models = ["dcim.rack"]
 
     def right_page(self):
+        # Injects a script (no visible panel here) which places an "SVG
+        # offline" button right next to each native "SVG herunterladen"
+        # link, since NetBox renders those inside the per-face elevation
+        # cards rather than through a plugin buttons() extension point.
         if not offline_svg_export_enabled():
             return ""
         rack = self.context["object"]