feat(mypage): 최신 공지 배열과 제목 롤링을 적용한다

SodaLive/Sources/V2/MyPage/Models/MyPageNoticeRoller.swift

@@ -0,0 +1,25 @@
+import Foundation
+
+struct MyPageNoticeRoller {
+    private var items: [NoticeItem] = []
+    private(set) var index = 0
+
+    var current: NoticeItem? {
+        items.isEmpty ? nil : items[index]
+    }
+
+    mutating func update(_ items: [NoticeItem]) {
+        guard self.items != items else { return }
+        self.items = items
+        index = 0
+    }
+
+    mutating func advance() {
+        guard items.count > 1 else { return }
+        index = (index + 1) % items.count
+    }
+
+    func shouldRoll(isVisible: Bool, isActive: Bool) -> Bool {
+        items.count > 1 && isVisible && isActive
+    }
+}