feat: Implement dynamic join solution

src/lib/moderation/queries.ts

@@ -55,42 +55,10 @@ export function buildSubmissionQuery(
 ) {
   const { entityFilter, statusFilter, tab, userId, isAdmin, isSuperuser } = config;
 
-  // Build base query with all needed data + user profiles (eliminate N+1 query)
+  // Use optimized view with pre-joined profiles and entity data
   let query = supabase
-    .from('content_submissions')
-    .select(`
-      id,
-      submission_type,
-      status,
-      content,
-      created_at,
-      submitted_at,
-      user_id,
-      reviewed_at,
-      reviewer_id,
-      reviewer_notes,
-      escalated,
-      assigned_to,
-      locked_until,
-      submitter:profiles!content_submissions_user_id_fkey (
-        user_id,
-        username,
-        display_name,
-        avatar_url
-      ),
-      reviewer:profiles!content_submissions_reviewer_id_fkey (
-        user_id,
-        username,
-        display_name,
-        avatar_url
-      ),
-      submission_items (
-        id,
-        item_type,
-        item_data,
-        status
-      )
-    `);
+    .from('moderation_queue_with_entities')
+    .select('*');
 
   // CRITICAL: Multi-level ordering
   // Level 1: Always sort by escalated first (descending) - escalated items always appear at top