功能：完善自定义主题与独立登录会话

frontend-web/src/pages/KnowledgeGraphPage.tsx

@@ -28,7 +28,7 @@ import {
   getNodeTitle,
 } from "@/components/knowledge-graph/graphUtils";
 import "@/components/knowledge-graph/graphStyles.css";
-import { useTheme } from "@/contexts/ThemeContext";
+import { themeToBaseMode, useTheme } from "@/contexts/ThemeContext";
 import {
   useGraphBlacklist,
   useGraphBlacklistActions,
@@ -799,7 +799,7 @@ export default function KnowledgeGraphPage() {
             searchMatchIds={searchMatchIds}
             layoutType={layoutType}
             showLabels={showLabels}
-            theme={theme}
+            theme={themeToBaseMode(theme)}
             onSelectNode={handleSelectNode}
             onTooltip={setTooltip}
             onZoomChange={setZoomLevel}