feat: clickable status badges, observer status alignment, CSV export all

- Admin projects: status summary badges are clickable to filter by round state
  with ring highlight, opacity fade, and clear button
- Add roundStates filter param to project.list backend query
  (filters by latest round state per project, consistent with counts)
- Observer status dropdown now uses ProjectRoundState values
  (Pending/In Progress/Completed/Passed/Rejected/Withdrawn)
- Observer status derived from latest ProjectRoundState instead of stale Project.status
- Observer CSV export fetches all matching projects, not just current page
- Add PENDING and PASSED styles to StatusBadge component

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

src/components/shared/status-badge.tsx

@@ -28,9 +28,11 @@ const STATUS_STYLES: Record<string, { variant: BadgeProps['variant']; className?
   NOT_REVIEWED: { variant: 'secondary', className: 'bg-slate-500/10 text-slate-600 border-slate-200 dark:text-slate-400' },
   REVIEWED: { variant: 'default', className: 'bg-emerald-500/10 text-emerald-700 border-emerald-200 dark:text-emerald-400' },
 
-  // Evaluation statuses
+  // Round state statuses
+  PENDING: { variant: 'secondary', className: 'bg-slate-500/10 text-slate-600 border-slate-200 dark:text-slate-400' },
   IN_PROGRESS: { variant: 'default', className: 'bg-blue-500/10 text-blue-700 border-blue-200 dark:text-blue-400' },
   COMPLETED: { variant: 'default', className: 'bg-emerald-500/10 text-emerald-700 border-emerald-200 dark:text-emerald-400' },
+  PASSED: { variant: 'default', className: 'bg-green-500/10 text-green-700 border-green-200 dark:text-green-400' },
 
   // User statuses
   NONE: { variant: 'secondary', className: 'bg-slate-500/10 text-slate-500 border-slate-200 dark:text-slate-400' },