feat: 更新FeedListView和MeView以增强图片预览功能

- 在FeedListView和MeView中新增previewCurrentIndex状态，支持图片预览的当前索引管理。
- 更新ImagePreviewPager的currentIndex绑定，确保预览逻辑的正确性。
- 在FeedListContentView中添加onImageTap回调，更新previewCurrentIndex以提升用户交互体验。
- 在MainView中调整底部内边距，优化布局效果。

yana/Views/FeedListView.swift

@@ -171,6 +171,7 @@ struct MomentsListView: View {
 struct FeedListContentView: View {
     let store: StoreOf<FeedListFeature>
     @Binding var previewItem: PreviewItem?
+    @Binding var previewCurrentIndex: Int
     
     var body: some View {
         WithViewStore(self.store, observe: { $0 }) { viewStore in
@@ -186,6 +187,7 @@ struct FeedListContentView: View {
                     hasMore: viewStore.hasMore,
                     isLoadingMore: viewStore.isLoadingMore,
                     onImageTap: { images, tappedIndex in
+                        previewCurrentIndex = tappedIndex
                         previewItem = PreviewItem(images: images, index: tappedIndex)
                     },
                     onMomentTap: { moment in
@@ -211,6 +213,7 @@ struct FeedListView: View {
     let store: StoreOf<FeedListFeature>
     // 新增：图片预览状态
     @State private var previewItem: PreviewItem? = nil
+    @State private var previewCurrentIndex: Int = 0
     
     var body: some View {
         WithViewStore(self.store, observe: { $0 }) { viewStore in
@@ -241,7 +244,8 @@ struct FeedListView: View {
                             // 动态内容列表
                             FeedListContentView(
                                 store: store,
-                                previewItem: $previewItem
+                                previewItem: $previewItem,
+                                previewCurrentIndex: $previewCurrentIndex
                             )
                             
                             Spacer()
@@ -275,7 +279,7 @@ struct FeedListView: View {
                 }
                 // 新增：图片预览弹窗
                 .fullScreenCover(item: $previewItem) { item in
-                    ImagePreviewPager(images: item.images, currentIndex: .constant(item.index)) {
+                    ImagePreviewPager(images: item.images, currentIndex: $previewCurrentIndex) {
                         previewItem = nil
                     }
                 }

yana/Views/MainView.swift

@@ -101,6 +101,7 @@ struct InternalMainView: View {
                     ))
                 }
                 .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .bottom)
+                .padding(.bottom, 100)
                 .ignoresSafeArea(.keyboard, edges: .bottom)
                 
                 // 添加API Loading和错误处理视图

yana/Views/MeView.swift

@@ -5,6 +5,7 @@ struct MeView: View {
     let store: StoreOf<MeFeature>
     // 新增：图片预览状态
     @State private var previewItem: PreviewItem? = nil
+    @State private var previewCurrentIndex: Int = 0
     
     var body: some View {
         WithViewStore(self.store, observe: { $0 }) { viewStore in
@@ -55,7 +56,7 @@ struct MeView: View {
                 }
                 // 新增：图片预览弹窗
                 .fullScreenCover(item: $previewItem) { item in
-                    ImagePreviewPager(images: item.images, currentIndex: .constant(item.index)) {
+                    ImagePreviewPager(images: item.images, currentIndex: $previewCurrentIndex) {
                         previewItem = nil
                     }
                 }
@@ -139,6 +140,7 @@ struct MeView: View {
                                 allMoments: viewStore.moments,
                                 currentIndex: index,
                                 onImageTap: { images, tappedIndex in
+                                    previewCurrentIndex = tappedIndex
                                     previewItem = PreviewItem(images: images, index: tappedIndex)
                                 },
                                 onLikeTap: { _, _, _, _ in