Enhance admin stats dashboard

Add data quality metrics, growth trends visualization, entity comparison views, and automated health checks to the AdminDatabaseStats dashboard, including new TS types, hooks, UI components, and integrated tabbed layout.

src/hooks/useDatabaseHealthCheck.ts

@@ -0,0 +1,21 @@
+import { useQuery } from '@tanstack/react-query';
+import { supabase } from '@/integrations/supabase/client';
+import { queryKeys } from '@/lib/queryKeys';
+import type { DatabaseHealthData } from '@/types/database-analytics';
+
+export function useDatabaseHealthCheck() {
+  return useQuery({
+    queryKey: queryKeys.analytics.databaseHealth(),
+    queryFn: async () => {
+      const { data, error } = await supabase.rpc('check_database_health');
+
+      if (error) {
+        throw error;
+      }
+
+      return data as unknown as DatabaseHealthData;
+    },
+    staleTime: 5 * 60 * 1000, // 5 minutes
+    refetchInterval: 2 * 60 * 1000, // Auto-refetch every 2 minutes (health is important!)
+  });
+}