fix(vscode-ide-companion): 修复代码高亮和抽屉组件的参数问题

- 删除markdown组件highlight函数中未使用的attrs参数
- 修改SessionList测试中mock的Drawer组件，去除onOpenChange参数
- 保证代码简洁并避免潜在错误风险

Author: hqwlkj

packages/vscode-ide-companion/src/webview/components/SessionList.test.tsx

@@ -23,7 +23,7 @@ vi.mock("@/webview/components/ui/input-group", () => ({
 }));
 
 vi.mock("@/webview/components/ui/drawer", () => ({
-  Drawer: vi.fn(({ children, open, onOpenChange }) => (
+  Drawer: vi.fn(({ children, open }) => (
     <div data-testid="drawer" data-open={open}>
       {children}
     </div>

packages/vscode-ide-companion/src/webview/components/markdown/index.tsx

@@ -94,7 +94,7 @@ const createMarkdownInstance = (): MarkdownIt => {
     breaks: true,
     linkify: true,
     typographer: true,
-    highlight: function (str, lang, attrs) {
+    highlight: function (str, lang) {
       if (lang && hljs.getLanguage(lang)) {
         try {
           return (