Comprehensive platform audit: security, UX, performance, and visual polish

Phase 1: Security - status transition validation, Zod tightening, DB indexes, transactions

Phase 2: Admin UX - search/filter for awards, learning, partners pages

Phase 3: Dashboard - Recent Activity feed, Pending Actions card, quick actions

Phase 4: Jury - assignments progress/urgency, autosave indicator, divergence highlighting

Phase 5: Portals - observer charts, mentor search, login/onboarding polish

Phase 6: Messages preview dialog, CsvExportDialog with column selection

Phase 7: Performance - query optimizations, loading skeletons, useDebounce hook

Phase 8: Visual - AnimatedCard, hover effects, StatusBadge, empty state CTAs

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

src/hooks/use-debounce.ts

@@ -0,0 +1,12 @@
+import { useState, useEffect } from 'react'
+
+export function useDebounce<T>(value: T, delay: number = 300): T {
+  const [debouncedValue, setDebouncedValue] = useState<T>(value)
+
+  useEffect(() => {
+    const timer = setTimeout(() => setDebouncedValue(value), delay)
+    return () => clearTimeout(timer)
+  }, [value, delay])
+
+  return debouncedValue
+}