Multi-role members, round detail UI overhaul, dashboard jury progress, and submit bug fix

- Add roles UserRole[] to User model with migration + backfill from existing role column
- Update auth JWT/session to propagate roles array with [role] fallback for stale tokens
- Update tRPC hasRole() middleware and add userHasRole() helper for inline role checks
- Update ~15 router inline checks and ~13 DB queries to use roles array
- Add updateRoles admin mutation with SUPER_ADMIN guard and priority-based primary role
- Add role switcher UI in admin sidebar and role-nav for multi-role users
- Remove redundant stats cards from round detail, add window dates to header banner
- Merge Members section into JuryProgressTable with inline cap editor and remove buttons
- Reorder round detail assignments tab: Progress > Score Dist > Assignments > Coverage > Jury Group
- Make score distribution fill full vertical height, reassignment history always open
- Add per-juror progress bars to admin dashboard ActiveRoundPanel for EVALUATION rounds
- Fix evaluation submit bug: use isSubmitting state instead of startMutation.isPending

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

src/app/(mentor)/layout.tsx

@@ -13,7 +13,8 @@ export default async function MentorLayout({
   const session = await requireRole('MENTOR', 'PROGRAM_ADMIN', 'SUPER_ADMIN')
 
   // Check if user has completed onboarding (for mentors)
-  if (session.user.role === 'MENTOR') {
+  const userRoles = session.user.roles?.length ? session.user.roles : [session.user.role]
+  if (userRoles.includes('MENTOR') && !userRoles.some(r => r === 'SUPER_ADMIN' || r === 'PROGRAM_ADMIN')) {
     const user = await prisma.user.findUnique({
       where: { id: session.user.id },
       select: { onboardingCompletedAt: true },