fix: enhance TOC navigation with scrollable overflow for better usability (#18636)

web/app/components/develop/doc.tsx

@@ -87,7 +87,7 @@ const Doc = ({ appDetail }: IDocProps) => {
       <div className={`fixed right-8 top-32 z-10 transition-all ${isTocExpanded ? 'w-64' : 'w-10'}`}>
         {isTocExpanded
           ? (
-            <nav className="toc w-full rounded-lg bg-components-panel-bg p-4 shadow-md">
+            <nav className="toc max-h-[calc(100vh-150px)] w-full overflow-y-auto rounded-lg bg-components-panel-bg p-4 shadow-md">
               <div className="mb-4 flex items-center justify-between">
                 <h3 className="text-lg font-semibold text-text-primary">{t('appApi.develop.toc')}</h3>
                 <button