Fix project detail crash: replace dynamic hooks with single query

The project detail page called useQuery inside .map() to fetch file
requirements per round, violating React's rules of hooks. When
competitionRounds changed from [] to [round1, round2], the hook count
changed, causing React to crash with "Cannot read properties of
undefined (reading 'length')".

Fix: Add listRequirementsByRounds endpoint that accepts multiple
roundIds in one query, replacing the dynamic hook pattern with a
single stable useQuery call.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/(admin)/admin/projects/[id]/page.tsx

@@ -105,14 +105,13 @@ function ProjectDetailContent({ projectId }: { projectId: string }) {
   // Extract all rounds from the competition
   const competitionRounds = competition?.rounds || []
 
-  // Fetch requirements for each round
+  // Fetch requirements for all rounds in a single query (avoids dynamic hook violation)
-  const requirementQueries = competitionRounds.map((round: { id: string; name: string }) =>
+  const roundIds = competitionRounds.map((r: { id: string }) => r.id)
-    trpc.file.listRequirements.useQuery({ roundId: round.id })
+  const { data: allRequirements = [] } = trpc.file.listRequirementsByRounds.useQuery(
+    { roundIds },
+    { enabled: roundIds.length > 0 }
   )
 
-  // Combine requirements from all rounds
-  const allRequirements = requirementQueries.flatMap((q: { data?: unknown[] }) => q.data || [])
-
   const utils = trpc.useUtils()
 
   if (isLoading) {
@@ -592,7 +591,7 @@ function ProjectDetailContent({ projectId }: { projectId: string }) {
                                   </p>
                                 )}
                                 <div className="flex items-center gap-2 text-xs text-muted-foreground mt-0.5">
-                                  {req.acceptedMimeTypes.length > 0 && (
+                                  {req.acceptedMimeTypes?.length > 0 && (
                                     <span>
                                       {req.acceptedMimeTypes.map((mime: string) => {
                                         if (mime === 'application/pdf') return 'PDF'

src/server/routers/file.ts

@@ -818,6 +818,20 @@ export const fileRouter = router({
       })
     }),
 
+  /**
+   * List file requirements for multiple rounds in a single query.
+   * Avoids dynamic hook violations when fetching requirements per-round.
+   */
+  listRequirementsByRounds: protectedProcedure
+    .input(z.object({ roundIds: z.array(z.string()).max(50) }))
+    .query(async ({ ctx, input }) => {
+      if (input.roundIds.length === 0) return []
+      return ctx.prisma.fileRequirement.findMany({
+        where: { roundId: { in: input.roundIds } },
+        orderBy: { sortOrder: 'asc' },
+      })
+    }),
+
   /**
    * Create a file requirement for a stage (admin only)
    */