feat: 新增图片预览功能与现代图片选择组件

- 在EditFeedView中集成ImagePreviewPager，支持全屏图片预览。
- 更新ModernImageSelectionGrid，添加图片点击事件以触发预览。
- 移除冗余的PhotosUI导入，优化代码结构。

yana/Views/EditFeedView.swift

@@ -1,5 +1,7 @@
 import SwiftUI
 import ComposableArchitecture
+import PhotosUI
+//import ImagePreviewPager
 
 struct EditFeedView: View {
     let onDismiss: () -> Void
@@ -209,7 +211,6 @@ struct EditFeedView: View {
 //}
 
 // MARK: - 九宫格图片选择组件
-import PhotosUI
 struct ModernImageSelectionGrid: View {
     let images: [UIImage]
     let selectedItems: [PhotosPickerItem]
@@ -217,21 +218,26 @@ struct ModernImageSelectionGrid: View {
     let onItemsChanged: ([PhotosPickerItem]) -> Void
     let onRemoveImage: (Int) -> Void
     private let columns = Array(repeating: GridItem(.flexible(), spacing: 8), count: 3)
+    @State private var showPreview = false
+    @State private var previewIndex = 0
     var body: some View {
-        // 将gridItemSize移入body内部变量
         let totalSpacing: CGFloat = 8 * 2
         let totalWidth = UIScreen.main.bounds.width - 24 * 2 - totalSpacing
         let gridItemSize: CGFloat = totalWidth / 3
         WithPerceptionTracking {
             LazyVGrid(columns: columns, spacing: 8) {
-                ForEach(Array(images.enumerated()), id: \ .offset) { index, image in
+                ForEach(Array(images.enumerated()), id: \.offset) { index, image in
                     ZStack(alignment: .topTrailing) {
                         Image(uiImage: image)
                             .resizable()
-                            .aspectRatio(1, contentMode: .fill)
+                            .aspectRatio(contentMode: .fill) // aspectFill
                             .frame(width: gridItemSize, height: gridItemSize)
                             .clipped()
                             .cornerRadius(12)
+                            .onTapGesture {
+                                previewIndex = index
+                                showPreview = true
+                            }
                         Button(action: {
                             onRemoveImage(index)
                         }) {
@@ -265,7 +271,9 @@ struct ModernImageSelectionGrid: View {
                     }
                 }
             }
+            .fullScreenCover(isPresented: $showPreview) {
+                ImagePreviewPager(images: images, currentIndex: $previewIndex, onClose: { showPreview = false })
+            }
         }
     }
-    // 移除gridItemSize属性，全部逻辑已移入body
 }

yana/Views/ImagePreviewPager.swift

@@ -0,0 +1,29 @@
+import SwiftUI
+
+struct ImagePreviewPager: View {
+    let images: [UIImage]
+    @Binding var currentIndex: Int
+    let onClose: () -> Void
+    var body: some View {
+        ZStack(alignment: .topTrailing) {
+            Color.black.ignoresSafeArea()
+            TabView(selection: $currentIndex) {
+                ForEach(images.indices, id: \Int.self) { idx in
+                    Image(uiImage: images[idx])
+                        .resizable()
+                        .aspectRatio(contentMode: .fit)
+                        .frame(maxWidth: .infinity, maxHeight: .infinity)
+                        .background(Color.black)
+                        .tag(idx)
+                }
+            }
+            .tabViewStyle(PageTabViewStyle(indexDisplayMode: .always))
+            Button(action: { onClose() }) {
+                Image(systemName: "xmark.circle.fill")
+                    .font(.system(size: 32))
+                    .foregroundColor(.white)
+                    .padding(24)
+            }
+        }
+    }
+}