feat: observer UX overhaul — reports, projects, charts, session & email

- Observer projects: default sort by status (rejected last), sortable status column
- Observer projects: search by country, institution, geographic zone
- Observer project detail: vertical timeline connectors between rounds
- Fix React key warning in ExpandableJurorTable and FilteringReportTabs
- Fix ScoreBadge text always white for better contrast on all backgrounds
- Remove misleading /30 denominator from heatmap juror reviewed count
- INTAKE stats: show Start-ups, Business Concepts, Countries (not States/Categories)
- DiversityMetrics: extractCountry() for country-only display in charts
- Fix nested button hydration error in filtering report mobile view
- Color project titles by outcome in filtering report (green/red/amber)
- Redesign CrossStageComparisonChart: funnel viz + metrics table with attrition %
- Center doughnut chart in StatusBreakdownChart
- Remove redundant RoundTypeStatsCards from evaluation report
- Move evaluation tab bar below overview header, rename to "Juror Assignments"
- Dev email override system (DEV_EMAIL_OVERRIDE env var)
- Session refresh on role change without re-login
- Role switcher in user dropdown menu
- formatCategory() utility for consistent category display
- Activity feed max height constraint

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

src/lib/utils.ts

@@ -60,6 +60,16 @@ export function daysUntil(date: Date | string): number {
   return Math.ceil((target.getTime() - now.getTime()) / (1000 * 60 * 60 * 24))
 }
 
+const CATEGORY_LABELS: Record<string, string> = {
+  STARTUP: 'Start-up',
+  BUSINESS_CONCEPT: 'Business Concept',
+}
+
+export function formatCategory(category: string | null | undefined): string {
+  if (!category) return ''
+  return CATEGORY_LABELS[category] ?? category.replace(/_/g, ' ')
+}
+
 export function formatRelativeTime(date: Date | string): string {
   const now = new Date()
   const target = new Date(date)