Report every failed fetch instead of discarding it

Twenty-four fetch chains ended in an empty catch, which is not error handling
but error deletion: the request fails, nothing renders, nothing is logged, and
the surface sits on Loading forever. That is how the mesh chat's ReferenceError
read as a slow load for as long as it did.

Plugin/unraid/pages/setup.php

@@ -662,7 +662,7 @@ function vvStartPhase2Watch(sinceMs) {
         const done = (d.items || []).some(i => i.id === 'partnership' && i.ok);
         if (done || Date.now() > deadline) stop();
       })
-      .catch(() => {});
+      .catch(e => vvFetchErr('setup checklist', e));
   };
 
   // Redraw between checklist polls so the elapsed counter moves. Without it the panel is static