实现pdf中划句子ai伴读的功能，修复pdf高亮显示的问题

src/modules/ui/itemPaneSection.ts

@@ -1,5 +1,6 @@
 /** Helpers for Zotero ItemPane collapsible sections. */
 
+import { config } from "../../../package.json";
 import { getLocaleID, getString } from "../../utils/locale";
 import { getPref, setPref } from "../../utils/prefs";
 import { openChatPaneWindow, openLecturePaneWindow } from "./itemPaneWindow";
@@ -17,9 +18,14 @@ const FIXED_HEIGHT: Record<ItemPaneKind, number> = {
   lecture: 420,
 };
 
-const OPEN_WINDOW_ICON = "chrome://zotero/skin/16/universal/open.svg";
-const ADAPTIVE_ICON = "chrome://zotero/skin/16/universal/expand-all.svg";
-const ADAPTIVE_ICON_OFF = "chrome://zotero/skin/16/universal/collapse-all.svg";
+/** Lucide-derived toolbar icons (see addon/content/icons/pane-*.svg). */
+function paneIconURL(file: string): string {
+  return `chrome://${config.addonRef}/content/icons/${file}`;
+}
+
+const OPEN_WINDOW_ICON = paneIconURL("pane-open-window.svg");
+const ADAPTIVE_ICON = paneIconURL("pane-adaptive-height.svg");
+const ADAPTIVE_ICON_OFF = paneIconURL("pane-adaptive-height-fixed.svg");
 
 export function prepareItemPaneBody(body: HTMLElement): void {
   body.classList.add("chatpapers-pane-body");