chore: 将全屏按钮置于顶部，使其显眼且易于操作 (#969)

* chore: 将全屏按钮置于顶部，使其显眼且易于操作

types/global.d.ts

@@ -38,6 +38,15 @@ declare global {
     msRequestAnimationFrame: (callback: FrameRequestCallback) => number;
   }
 
+  /**
+   * Document 的类型提示
+   */
+  interface Document {
+    webkitFullscreenElement?: Element;
+    mozFullScreenElement?: Element;
+    msFullscreenElement?: Element;
+  }
+
   /**
    * 打包压缩格式的类型声明
    */