feat: 增强FeedListFeature和MeFeature的首次加载逻辑

- 在FeedListFeature和MeFeature中新增isFirstLoad状态，确保仅在首次加载时请求数据。
- 更新MainView以简化视图切换逻辑，使用isHidden修饰符控制视图显示。
- 新增View+isHidden扩展，提供视图隐藏功能，提升代码可读性和复用性。

yana/Features/MainFeature.swift

@@ -103,10 +103,10 @@ struct MainFeature: Reducer {
             }
         }
         // 设置页作用域
-        .ifLet(\ .settingState, action: /Action.settingAction) {
+        .ifLet(\ .settingState, action: \.settingAction) {
             SettingFeature()
         }
-        .ifLet(\ .appSettingState, action: /Action.appSettingAction) {
+        .ifLet(\ .appSettingState, action: \.appSettingAction) {
             AppSettingFeature()
         }
     }