fix(rail, transit): a train or vehicle a first-person view holds draws no 3D model either, since the view's eye is inside it; let go, its model draws again

The fleet models (#1714) draw nearby trains and vehicles under the 3D toggle. A
held one now leaves out its model as it does its icon, as the Vessels layer does
for its bridge subject: its model item is hidden, and handing the visual back
to its icon keeps the icon hidden while held. Tests drive each layer with the
real fleet-model layer and a stubbed glTF loader; both fail without the fix.

scripts/format-scope.json

@@ -1441,5 +1441,6 @@
   "src/data/fleetModels.test.mjs",
   "src/data/fleetModelInstances.test.mjs",
   "src/testSupport/fleetGlb.mjs",
+  "src/testSupport/fleetModelFakes.mjs",
   "scripts/measure-fleet-trail-anchors.mjs"
 ]