fix(frontend): プロファイルを復元後アカウントの切り替えができない問題を修正

Fix #16508

packages/frontend/src/components/MkSignin.vue

@@ -20,6 +20,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			key="input"
 			:message="message"
 			:openOnRemote="openOnRemote"
+			:initialUsername="initialUsername"
 
 			@usernameSubmitted="onUsernameSubmitted"
 			@passkeyClick="onPasskeyLogin"
@@ -89,10 +90,12 @@ const props = withDefaults(defineProps<{
 	autoSet?: boolean;
 	message?: string,
 	openOnRemote?: OpenOnRemoteOptions,
+	initialUsername?: string;
 }>(), {
 	autoSet: false,
 	message: '',
 	openOnRemote: undefined,
+	initialUsername: undefined,
 });
 
 const page = ref<'input' | 'password' | 'totp' | 'passkey'>('input');