Improve load toaster.

Author: LJHAAAAA

src/toaster/toaster.js

@@ -15,9 +15,12 @@ export default class Toaster {
   constructor() {
     if (!isBrowser) return;
 
-    const container = document.createElement('div');
-    container.setAttribute('data-evergreen-toaster-container', '');
-    document.body.appendChild(container);
+    let container = document.querySelector('[data-evergreen-toaster-container]');
+    if (!container) {
+      container = document.createElement('div');
+      container.setAttribute('data-evergreen-toaster-container', '');
+      document.body.appendChild(container);
+    }
 
     const root = createRoot(container);
     root.render(