refactor: update document filtering logic to maintain complete dataset and clear selections on filter change

surfsense_web/app/dashboard/[search_space_id]/documents/(manage)/page.tsx

@@ -140,6 +140,9 @@ export default function DocumentsTable() {
 			}
 		});
 		setPageIndex(0);
+		// Clear selections when filter changes — selected IDs from the previous
+		// filter view are no longer visible and would cause misleading bulk actions
+		setSelectedIds(new Set());
 	};
 
 	const onBulkDelete = async () => {