feat: 新增应用设置功能及相关视图

- 在MainFeature中集成AppSettingFeature，支持应用设置页面的导航与状态管理。
- 新增AppSettingView以展示用户头像和昵称编辑功能，提升用户体验。
- 更新MainView以支持应用设置页面的展示，增强导航功能。

yana/Features/MainFeature.swift

@@ -15,12 +15,14 @@ struct MainFeature: Reducer {
         // 新增：导航路径和设置页面 State
         var navigationPath: [Destination] = []
         var settingState: SettingFeature.State? = nil
+        var appSettingState: AppSettingFeature.State? = nil
     }
     
     // 新增：导航目标
     enum Destination: Hashable, Equatable {
         case setting
         case test
+        case appSetting
     }
     
     @CasePathable
@@ -35,6 +37,8 @@ struct MainFeature: Reducer {
         case settingButtonTapped
         case settingAction(SettingFeature.Action)
         case testButtonTapped
+        case appSettingButtonTapped
+        case appSettingAction(AppSettingFeature.Action)
     }
     
     var body: some ReducerOf<Self> {
@@ -66,8 +70,8 @@ struct MainFeature: Reducer {
                 return .none
             case .me(.settingButtonTapped):
                 // 触发 push 到设置页
-                state.settingState = SettingFeature.State()
-                state.navigationPath.append(.setting)
+                state.appSettingState = AppSettingFeature.State()
+                state.navigationPath.append(.appSetting)
                 return .none
             case .me:
                 return .none
@@ -76,6 +80,9 @@ struct MainFeature: Reducer {
                 if !newPath.contains(.setting) {
                     state.settingState = nil
                 }
+                if !newPath.contains(.appSetting) {
+                    state.appSettingState = nil
+                }
                 state.navigationPath = newPath
                 return .none
             case .settingButtonTapped:
@@ -87,11 +94,20 @@ struct MainFeature: Reducer {
             case .testButtonTapped:
                 state.navigationPath.append(.test)
                 return .none
+            case .appSettingButtonTapped:
+                state.appSettingState = AppSettingFeature.State()
+                state.navigationPath.append(.appSetting)
+                return .none
+            case .appSettingAction:
+                return .none
             }
         }
         // 设置页作用域
         .ifLet(\ .settingState, action: /Action.settingAction) {
             SettingFeature()
         }
+        .ifLet(\ .appSettingState, action: /Action.appSettingAction) {
+            AppSettingFeature()
+        }
     }
 }