Ability to copying authorization URL for Gmail (#375)

* Implemented copying auth URL for Gmail authentication.

* Update Button icon and add row spacing in Flyout grid

The icon used in the Button.Content has been updated to a new
design and is now wrapped inside a Viewbox with a width of 20
to ensure proper scaling. Additionally, the Grid inside the
Flyout now includes RowSpacing="12" to improve visual separation
between rows.

Wino.Mail.ViewModels/AccountManagementViewModel.cs

@@ -196,7 +196,8 @@ namespace Wino.Mail.ViewModels
 
                         var tokenInformationResponse = await _winoServerConnectionManager
                             .GetResponseAsync<TokenInformation, AuthorizationRequested>(new AuthorizationRequested(accountCreationDialogResult.ProviderType,
-                                                                                                                   createdAccount), accountCreationCancellationTokenSource.Token);
+                                                                                                                   createdAccount,
+                                                                                                                   createdAccount.ProviderType == MailProviderType.Gmail), accountCreationCancellationTokenSource.Token);
 
                         if (creationDialog.State == AccountCreationDialogState.Canceled)
                             throw new AccountSetupCanceledException();