Observer dashboard extraction, PDF reports, jury UX overhaul, and miscellaneous improvements

- Extract observer dashboard to client component, add PDF export button
- Add PDF report generator with jsPDF for analytics reports
- Overhaul jury evaluation page with improved layout and UX
- Add new analytics endpoints for observer/admin reports
- Improve round creation/edit forms with better settings
- Fix filtering rules page, CSV export dialog, notification bell
- Update auth, prisma schema, and various type fixes

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

src/components/shared/csv-export-dialog.tsx

@@ -132,13 +132,16 @@ export function CsvExportDialog({
       ),
     ].join('\n')
 
-    const blob = new Blob([csvContent], { type: 'text/csv;charset=utf-8;' })
+    const blob = new Blob(['\ufeff' + csvContent], { type: 'text/csv;charset=utf-8;' })
     const url = URL.createObjectURL(blob)
     const link = document.createElement('a')
     link.href = url
     link.download = `${filename}-${new Date().toISOString().split('T')[0]}.csv`
+    document.body.appendChild(link)
     link.click()
-    URL.revokeObjectURL(url)
+    document.body.removeChild(link)
+    // Delay revoking to ensure download starts before URL is invalidated
+    setTimeout(() => URL.revokeObjectURL(url), 1000)
     onOpenChange(false)
   }