fixes for theme handling on account switching and re-adding existing account

src/App/App.xaml.cs

@@ -110,6 +110,10 @@ namespace Bit.App
                 {
                     await AddAccount();
                 }
+                else if (message.Command == "accountAdded")
+                {
+                    UpdateTheme();
+                }
                 else if (message.Command == "switchedAccount")
                 {
                     await SwitchedAccountAsync();

src/App/Utilities/AppHelpers.cs

@@ -483,6 +483,11 @@ namespace Bit.App.Utilities
                     settingsService.ClearAsync(userId),
                     vaultTimeoutService.ClearAsync(userId),
                     stateService.ClearAsync(userId));
+                if (await stateService.GetActiveUserIdAsync() != null)
+                {
+                    var messagingService = ServiceContainer.Resolve<IMessagingService>("messagingService");
+                    messagingService.Send("switchedAccount");
+                }
             }
             stateService.BiometricLocked = true;
             searchService.ClearIndex();

src/Core/Services/AuthService.cs

@@ -370,6 +370,7 @@ namespace Bit.Core.Services
                     }
                 )
             );
+            _messagingService.Send("accountAdded");
             if (_setCryptoKeys)
             {
                 if (key != null)