feat: chat — group settings (rename, photo, add/remove members), fix mention underline style

src/lib/api.ts

@@ -360,6 +360,8 @@ export const api = {
       req<{ id: string; name: string; role: string }[]>('GET', `/api/hotels/${slug}/chat/members`),
     createGroup: (slug: string, name: string, memberIds: string[]) =>
       req<{ roomId: string }>('POST', `/api/hotels/${slug}/chat/group`, { name, memberIds }),
+    updateGroup: (slug: string, roomId: string, patch: { name?: string; avatarUrl?: string; addMemberIds?: string[]; removeMemberIds?: string[] }) =>
+      req<{ ok: boolean }>('PATCH', `/api/hotels/${slug}/chat/rooms/${roomId}/group`, patch),
     editMessage: (slug: string, roomId: string, msgId: string, text: string) =>
       req<ChatMessage>('PATCH', `/api/hotels/${slug}/chat/rooms/${roomId}/messages/${msgId}`, { text }),
     deleteMessage: (slug: string, roomId: string, msgId: string) =>
@@ -1351,6 +1353,7 @@ export interface ChatRoom {
   otherUserLastRead: string | null
   memberCount: number
   memberNames: string[] | null
+  avatarUrl: string | null
 }
 
 export interface ChatReaction {