Fix analyze_data_completeness jsonb

- Add safe JSONB array null filtering via helper and update analyze_data_completeness
- Ensure search_path set to public in helper function
- Add admin-page guard to useDataCompleteness to disable on non-admin routes

src/integrations/supabase/types.ts

@@ -6816,6 +6816,7 @@ export type Database = {
         Returns: string
       }
       extract_cf_image_id: { Args: { url: string }; Returns: string }
+      filter_jsonb_array_nulls: { Args: { arr: Json }; Returns: Json }
       generate_deletion_confirmation_code: { Args: never; Returns: string }
       generate_incident_number: { Args: never; Returns: string }
       generate_notification_idempotency_key: {