Fix main & improve cursor sync (#101)

frontend/sync-client/src/services/types/DocumentWithCursors.ts

@@ -2,7 +2,7 @@
 import type { CursorSpan } from "./CursorSpan";
 
 export interface DocumentWithCursors {
-	vault_update_id: number;
+	vault_update_id: number | null;
 	document_id: string;
 	relative_path: string;
 	cursors: CursorSpan[];

frontend/sync-client/src/services/websocket-manager.ts

@@ -152,7 +152,7 @@ export class WebSocketManager {
 				}
 				// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
 			} else if (message.type === "cursorPositions") {
-				this.logger.info(
+				this.logger.debug(
 					`Received cursor positions for ${JSON.stringify(message.clients)}`
 				);
 				this.remoteCursorsUpdateListeners.forEach((listener) => {