feat(Toast): add Toast nearly identical to ChatGPT's (#1108)

client/src/store/index.ts

@@ -4,6 +4,7 @@ import endpoints from './endpoints';
 import models from './models';
 import user from './user';
 import text from './text';
+import toast from './toast';
 import submission from './submission';
 import search from './search';
 import preset from './preset';
@@ -17,6 +18,7 @@ export default {
   ...models,
   ...user,
   ...text,
+  ...toast,
   ...submission,
   ...search,
   ...preset,

client/src/store/toast.ts

@@ -0,0 +1,14 @@
+import { atom } from 'recoil';
+import { NotificationSeverity } from '~/common';
+
+const toastState = atom({
+  key: 'toastState',
+  default: {
+    open: false,
+    message: '',
+    severity: NotificationSeverity.SUCCESS,
+    showIcon: true,
+  },
+});
+
+export default { toastState };