Fix multi-click submit bug and add draft submit indicator on juror dashboard

- Initialize slider values to midpoint so visual matches stored value
  (root cause: sliders appeared filled but criteriaValues was undefined)
- Use mutateAsync for submit to properly await and prevent double-clicks
- Add startMutation.isPending to submit button disabled state
- Add error toast in evaluation-form.tsx catch block (was silent)
- Show "Ready to submit" badge and "Review & Submit" button for drafts
  on juror dashboard

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

src/app/(jury)/jury/page.tsx

@@ -26,6 +26,7 @@ import {
   Zap,
   BarChart3,
   Waves,
+  Send,
 } from 'lucide-react'
 import { formatDateOnly } from '@/lib/utils'
 import { CountdownTimer } from '@/components/shared/countdown-timer'
@@ -390,6 +391,11 @@ async function JuryDashboardContent() {
                                 <CheckCircle2 className="mr-1 h-3 w-3" />
                                 Done
                               </Badge>
+                            ) : isDraft && isVotingOpen ? (
+                              <Badge className="text-xs bg-amber-100 text-amber-800 border-amber-300 dark:bg-amber-950 dark:text-amber-300 dark:border-amber-700 animate-pulse">
+                                <Send className="mr-1 h-3 w-3" />
+                                Ready to submit
+                              </Badge>
                             ) : isDraft ? (
                               <Badge variant="warning" className="text-xs">
                                 <Clock className="mr-1 h-3 w-3" />
@@ -404,10 +410,17 @@ async function JuryDashboardContent() {
                                   View
                                 </Link>
                               </Button>
+                            ) : isVotingOpen && isDraft ? (
+                              <Button size="sm" asChild className="h-7 px-3 bg-amber-600 hover:bg-amber-700 text-white shadow-sm">
+                                <Link href={`/jury/competitions/${assignment.round.id}/projects/${assignment.project.id}/evaluate`}>
+                                  <Send className="mr-1 h-3 w-3" />
+                                  Review & Submit
+                                </Link>
+                              </Button>
                             ) : isVotingOpen ? (
                               <Button size="sm" asChild className="h-7 px-3 bg-brand-blue hover:bg-brand-blue-light shadow-sm">
                                 <Link href={`/jury/competitions/${assignment.round.id}/projects/${assignment.project.id}/evaluate`}>
-                                  {isDraft ? 'Continue' : 'Evaluate'}
+                                  Evaluate
                                 </Link>
                               </Button>
                             ) : (