Rack: clicking a port on an unlinked faceplate opens the cutsheet

The NVR Pro is drawn by Front drawing because UniFi doesn't report it, so
it has no device page; clicking one of its ports went to /device/UNVR-Pro
and showed "No device with this name". Ports on a faceplate whose item
isn't linked to a live device now open the port's cable when one is
documented, and otherwise the item on the cutsheet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

static/rack.js

@@ -327,6 +327,13 @@ function onLeave(e) {
 
 function openPort(el) {
   if (el.classList.contains('fp-port')) {
+    const item = _rack && _rack.items.find(i => i.device === el.dataset.switch);
+    if (item && !item.linked) {
+      // A faceplate drawn by Front drawing for gear Gandalf can't see (the NVR) has no device page:
+      // open the port's cable if one is documented, otherwise the item on the cutsheet
+      location.href = el.dataset.cable ? `/cutsheet#cable-${encodeURIComponent(el.dataset.cable)}` : item.url;
+      return;
+    }
     location.href = `/device/${encodeURIComponent(el.dataset.switch)}#port-${encodeURIComponent(el.dataset.portIdx)}`;
   } else if (el.dataset.cable) {
     location.href = `/cutsheet#cable-${encodeURIComponent(el.dataset.cable)}`;