fix(问题修复): 修复页面刷新与缩略图竞态

assets/webui/ofdgo.js

@@ -155,6 +155,7 @@ function createDocumentState() {
 		selectedPages: new Set(),
 		documentSelection: null,
 		pageInFlight: new Map(),
+		pageLoadSeq: 0,
 		pageRenderQueue: [],
 		pagePrefetchIndex: null,
 		pagePrefetchDirection: 1,
@@ -170,7 +171,6 @@ function createDocumentState() {
 		thumbnailFrame: 0,
 		pageDragIndex: null,
 		pageListCurrent: null,
-		thumbnailInFlight: new Set(),
 		thumbnailObserver: null,
 		visibleThumbnails: new Set(),
 		exportFormats: [],