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/server/routers/dashboard.ts

@@ -185,7 +185,7 @@ export const dashboardRouter = router({
         // 9. Total jurors
         ctx.prisma.user.count({
           where: {
-            role: 'JURY_MEMBER',
+            roles: { has: 'JURY_MEMBER' },
             status: { in: ['ACTIVE', 'INVITED', 'NONE'] },
             assignments: { some: { round: { competition: { programId: editionId } } } },
           },
@@ -194,7 +194,7 @@ export const dashboardRouter = router({
         // 10. Active jurors
         ctx.prisma.user.count({
           where: {
-            role: 'JURY_MEMBER',
+            roles: { has: 'JURY_MEMBER' },
             status: 'ACTIVE',
             assignments: { some: { round: { competition: { programId: editionId } } } },
           },