Fix moderation type errors

src/components/moderation/ActivityCard.tsx

@@ -12,11 +12,11 @@ interface ActivityCardProps {
     entity_type?: string;
     entity_name?: string;
     timestamp: string;
-    moderator_id?: string;
+    moderator_id?: string | null;
     moderator?: {
       username: string;
-      display_name?: string;
-      avatar_url?: string;
+      display_name?: string | null;
+      avatar_url?: string | null;
     };
   };
 }

src/components/moderation/ItemEditDialog.tsx

@@ -295,8 +295,8 @@ export function ItemEditDialog({ item, items, open, onOpenChange, onComplete }:
 // Simple photo editing form for caption and credit
 interface PhotoItem {
   url: string;
-  caption?: string;
-  credit?: string;
+  caption?: string | null;
+  credit?: string | null;
 }
 
 function PhotoEditForm({ 

src/components/moderation/ReassignDialog.tsx

@@ -24,7 +24,7 @@ import { logger } from '@/lib/logger';
 interface Moderator {
   user_id: string;
   username: string;
-  display_name?: string;
+  display_name?: string | null;
   role: string;
 }
 

src/components/moderation/RecentActivity.tsx

@@ -15,11 +15,11 @@ interface ActivityItem {
   entity_type?: string;
   entity_name?: string;
   timestamp: string;
-  moderator_id?: string;
+  moderator_id?: string | null;
   moderator?: {
     username: string;
-    display_name?: string;
-    avatar_url?: string;
+    display_name?: string | null;
+    avatar_url?: string | null;
   };
 }
 

src/components/moderation/ReportsQueue.tsx

@@ -71,12 +71,12 @@ interface Report {
   reported_entity_type: ReportEntityType;
   reported_entity_id: string;
   report_type: string;
-  reason: string;
+  reason: string | null;
   status: string;
   created_at: string;
   reporter_profile?: {
     username: string;
-    display_name?: string;
+    display_name?: string | null;
   };
   reported_content?: ReportedContent;
 }