Fix: Load multiple chats during first startup (microsoft#1198)

### Motivation and Context

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When the application initially starts without any chat sessions in the
database, the app will attempt to create a new one. Currently, the app
will attempt multiple times without waiting for the initial attempt to
finish. This PR fixes the issue by introducing an intermediate state.

### Description

<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows the [Contribution
Guidelines](https://github.com/microsoft/chat-copilot/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/chat-copilot/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

webapp/src/App.tsx

@@ -2,7 +2,7 @@ import { AuthenticatedTemplate, UnauthenticatedTemplate, useIsAuthenticated, use
 import { FluentProvider, Subtitle1, makeStyles, shorthands, tokens } from '@fluentui/react-components';
 
 import * as React from 'react';
-import { useEffect, useCallback } from 'react';
+import { useCallback, useEffect } from 'react';
 import Chat from './components/chat/Chat';
 import { Loading, Login } from './components/views';
 import { AuthHelper } from './libs/auth/AuthHelper';
@@ -49,6 +49,7 @@ export enum AppState {
     SettingUserInfo,
     ErrorLoadingChats,
     ErrorLoadingUserInfo,
+    LoadChats,
     LoadingChats,
     Chat,
     SigningOut,
@@ -98,16 +99,20 @@ const App = () => {
                     );
                 }
 
-                handleAppStateChange(AppState.LoadingChats);
+                handleAppStateChange(AppState.LoadChats);
             }
         }
 
-        if ((isAuthenticated || !AuthHelper.isAuthAAD()) && appState === AppState.LoadingChats) {
+        if ((isAuthenticated || !AuthHelper.isAuthAAD()) && appState === AppState.LoadChats) {
+            handleAppStateChange(AppState.LoadingChats);
             void Promise.all([
-                chat.loadChats()
-                    .then(() => { handleAppStateChange(AppState.Chat); })
+                chat
+                    .loadChats()
+                    .then(() => {
+                        handleAppStateChange(AppState.Chat);
+                    })
                     .catch((error) => {
-                        console.error("Error loading chats:", error);
+                        console.error('Error loading chats:', error);
                         handleAppStateChange(AppState.ErrorLoadingChats);
                     }),
                 file.getContentSafetyStatus(),
@@ -118,7 +123,6 @@ const App = () => {
                 }),
             ]);
         }
-
     }, [instance, isAuthenticated, appState, isMaintenance, handleAppStateChange, dispatch, chat, file]);
 
     const theme = features[FeatureKeys.DarkMode].enabled ? semanticKernelDarkTheme : semanticKernelLightTheme;

webapp/src/components/chat/Chat.tsx

@@ -21,7 +21,7 @@ const Chat = ({
                 ? // if AAD is enabled, we need to set the active account before loading chats
                   AppState.SettingUserInfo
                 : // otherwise, we can load chats immediately
-                  AppState.LoadingChats,
+                  AppState.LoadChats,
         );
     }, [setAppState]);
     return (