fix: humanize category label in unassigned queue row

Queue payload exposes the field as `category` (aliased from
`competitionCategory`), not `competitionCategory` itself, so the
previous lookup was always undefined and every project rendered as
"No category". Now shows "Startup" / "Business Concept" correctly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/admin/assignment/round-unassigned-queue.tsx

@@ -51,7 +51,11 @@ export function RoundUnassignedQueue({ roundId, requiredReviews = 3, onAssignUna
                 <div className="min-w-0">
                   <p className="text-sm font-medium truncate">{project.title}</p>
                   <p className="text-xs text-muted-foreground">
-                    {project.competitionCategory || 'No category'}
+                    {project.category === 'STARTUP'
+                      ? 'Startup'
+                      : project.category === 'BUSINESS_CONCEPT'
+                        ? 'Business Concept'
+                        : 'No category'}
                     {project.teamName && ` \u00b7 ${project.teamName}`}
                   </p>
                 </div>