Add cache invalidation to all project/round mutations platform-wide

Mutations for create, update, delete, import, filtering finalize,
override, and reinstate now properly invalidate related queries so
the UI updates without requiring a page refresh.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(admin)/admin/projects/new/page.tsx

@@ -59,9 +59,12 @@ function NewProjectPageContent() {
   })
 
   // Create mutation
+  const utils = trpc.useUtils()
   const createProject = trpc.project.create.useMutation({
     onSuccess: () => {
       toast.success('Project created successfully')
+      utils.project.list.invalidate()
+      utils.round.get.invalidate()
       router.push(`/admin/projects?round=${selectedRoundId}`)
     },
     onError: (error) => {