enhance: チャットが無効な場合はチャット関連の設定も隠すように

packages/frontend/src/pages/settings/preferences.vue

@@ -379,7 +379,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				</MkFolder>
 			</SearchMarker>
 
-			<SearchMarker :keywords="['chat', 'messaging']">
+			<SearchMarker v-if="$i.policies.chatAvailability !== 'unavailable'" :keywords="['chat', 'messaging']">
 				<MkFolder>
 					<template #label><SearchLabel>{{ i18n.ts.chat }}</SearchLabel></template>
 					<template #icon><i class="ti ti-messages"></i></template>
@@ -732,6 +732,9 @@ import MkFeatureBanner from '@/components/MkFeatureBanner.vue';
 import { globalEvents } from '@/events.js';
 import { claimAchievement } from '@/utility/achievements.js';
 import { instance } from '@/instance.js';
+import { ensureSignin } from '@/i.js';
+
+const $i = ensureSignin();
 
 const lang = ref(miLocalStorage.getItem('lang'));
 const dataSaver = ref(prefer.s.dataSaver);

packages/frontend/src/pages/settings/privacy.vue

@@ -78,7 +78,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</MkSwitch>
 		</SearchMarker>
 
+		<SearchMarker :keywords="['chat']">
 			<FormSection>
+				<template #label><SearchLabel>{{ i18n.ts.chat }}</SearchLabel></template>
+
+				<div class="_gaps_m">
+					<MkInfo v-if="$i.policies.chatAvailability === 'unavailable'">{{ i18n.ts._chat.chatNotAvailableForThisAccountOrServer }}</MkInfo>
 					<SearchMarker :keywords="['chat']">
 						<MkSelect v-model="chatScope" @update:modelValue="save()">
 							<template #label><SearchLabel>{{ i18n.ts._chat.chatAllowedUsers }}</SearchLabel></template>
@@ -90,7 +95,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<template #caption>{{ i18n.ts._chat.chatAllowedUsers_note }}</template>
 						</MkSelect>
 					</SearchMarker>
+				</div>
 			</FormSection>
+		</SearchMarker>
 
 		<SearchMarker :keywords="['lockdown']">
 			<FormSection>