Fix evaluation submission redirect to assignments page

The previous code incorrectly tried to extract a project ID from the
assignment ID by splitting on '-', which doesn't work with CUIDs.

Now redirects to /jury/assignments with a success toast message
after submitting an evaluation.

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

src/components/forms/evaluation-form.tsx

@@ -37,6 +37,7 @@ import {
   ThumbsDown,
 } from 'lucide-react'
 import { cn } from '@/lib/utils'
+import { toast } from 'sonner'
 
 // Define criterion type from the evaluation form JSON
 interface Criterion {
@@ -186,8 +187,10 @@ export function EvaluationForm({
       // Invalidate queries and redirect
       utils.assignment.myAssignments.invalidate()
 
+      toast.success('Evaluation submitted successfully!')
+
       startTransition(() => {
-        router.push(`/jury/projects/${assignmentId.split('-')[0]}/evaluation`)
+        router.push('/jury/assignments')
         router.refresh()
       })
     } catch (error) {