fix(主题): 使用主题变量替换确认对话框的按钮颜色

feat(组件): 添加VanDatetimePicker组件类型声明

@@ -63,7 +63,7 @@ if (import.meta.env.PROD) {
     showConfirmDialog({
       title: '温馨提示',
       message: '检测到新版本，是否刷新页面!',
-      confirmButtonColor: '#4caf50'
+      confirmButtonColor: themeVars.primaryColor
     }).then(() => {
       window.location.reload();
     });

@@ -44,6 +44,7 @@ declare module 'vue' {
     VanCol: typeof import('vant/es')['Col']
     VanConfigProvider: typeof import('vant/es')['ConfigProvider']
     VanDatePicker: typeof import('vant/es')['DatePicker']
+    VanDatetimePicker: typeof import('vant/es')['DatetimePicker']
     VanDialog: typeof import('vant/es')['Dialog']
     VanDivider: typeof import('vant/es')['Divider']
     VanDropdownItem: typeof import('vant/es')['DropdownItem']