Jury UX: fix COI modal, add sliders, redesign stats, gate evaluations

- Switch COI dialog from Dialog to AlertDialog (non-dismissible)
- Replace number inputs with sliders + rating buttons for criteria/global scores
- Redesign jury dashboard stat cards: compact strip on mobile, editorial grid on desktop
- Remove ROUND_ACTIVE filter from myAssignments so all assignments show
- Block evaluate page when round is inactive or voting window is closed
- Gate evaluate button on project detail page based on voting window status

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

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

@@ -74,7 +74,7 @@ export default function JuryAssignmentsPage() {
             </div>
             <h2 className="text-xl font-semibold mb-2">No Assignments</h2>
             <p className="text-muted-foreground text-center max-w-md">
-              You don&apos;t have any active assignments yet.
+              You don&apos;t have any assignments yet. Assignments will appear once an administrator assigns projects to you.
             </p>
           </CardContent>
         </Card>
@@ -95,6 +95,11 @@ export default function JuryAssignmentsPage() {
                       <Badge variant="secondary" className="text-xs">
                         {formatEnumLabel(round.roundType)}
                       </Badge>
+                      {round.status !== 'ROUND_ACTIVE' && (
+                        <Badge variant="outline" className="text-xs text-muted-foreground">
+                          {formatEnumLabel(round.status)}
+                        </Badge>
+                      )}
                     </div>
                     <div className="flex items-center gap-2">
                       <span className="text-xs text-muted-foreground">