Feat: Chat (#15686)

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* Update types.ts

* Create 1742203321812-chat.js

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* Update room.vue

* Update home.vue

* Update home.vue

* Update ja-JP.yml

* Update index.d.ts

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* Update CHANGELOG.md

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* Update home.vue

* clean up

* Update misskey-js.api.md

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* lint fixes

* lint

* Update UserEntityService.ts

* search

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* 🎨

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* Update home.ownedRooms.vue

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* Update CHANGELOG.md

* Update style.scss

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* improve performance

* improve performance

* Update timeline.test.ts

packages/backend/src/core/WebhookTestService.ts

@@ -53,6 +53,7 @@ function generateDummyUser(override?: Partial<MiUser>): MiUser {
 		requireSigninToViewContents: false,
 		makeNotesFollowersOnlyBefore: null,
 		makeNotesHiddenBefore: null,
+		chatScope: 'mutual',
 		emojis: [],
 		score: 0,
 		host: null,
@@ -461,6 +462,7 @@ export class WebhookTestService {
 			publicReactions: true,
 			followersVisibility: 'public',
 			followingVisibility: 'public',
+			chatScope: 'mutual',
 			twoFactorEnabled: false,
 			usePasswordLessLogin: false,
 			securityKeys: false,