feat: 支持 PDF 导出功能

src/App.vue

@@ -81,7 +81,7 @@ watch(currentFilePath, async (newFilePath) => {
     await readFileContent(newFilePath);
 })
 const getFileNameFromFilePath = (filePath) => {
-    const fullFileName = filePath.split('/').pop();
+    const fullFileName = currentFilePath.value.split('/').pop();
     const splitResult = fullFileName.split(".");
     splitResult.pop(); // 丢掉后缀
     return splitResult.join('.');

src/components/MainEditor.vue

@@ -45,7 +45,7 @@
 import 'md-editor-v3/lib/style.css';
 import '@vavt/v3-extension/lib/asset/PreviewThemeSwitch.css';
 import '@vavt/v3-extension/lib/asset/ExportPDF.css';
-import { MdEditor, MdCatalog, NormalToolbar } from 'md-editor-v3';
+import { MdEditor, MdCatalog, NormalToolbar, DropdownToolbar } from 'md-editor-v3';
 import { ThemeSwitch, PreviewThemeSwitch, ExportPDF } from '@vavt/v3-extension';
 import { ref, reactive, watch } from "vue";
 import { Message } from 'view-ui-plus'