feat: 首页入场动画 + 增大最近作品卡片尺寸

入场动画：
- heroSection 添加 opacity + offset 交错入场动画
- recentWorksSection/emptyStateHint 延迟 0.2s 后动画进入
- 使用 DesignTokens.Animation.standard 保持一致性

卡片尺寸：
- RecentWorkCard 从 110x150 增大到 130x178
- 保持相近比例，提升视觉冲击力和触控目标

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

to-live-photo/to-live-photo/Views/HomeView.swift

@@ -16,18 +16,26 @@ struct HomeView: View {
     @State private var selectedItem: PhotosPickerItem?
     @State private var isLoading = false
     @State private var errorMessage: String?
+    @State private var showHero = false
+    @State private var showRecentWorks = false
 
     var body: some View {
         ScrollView(showsIndicators: false) {
             VStack(spacing: DesignTokens.Spacing.xxl) {
                 // 顶部导入区域
                 heroSection
+                    .opacity(showHero ? 1 : 0)
+                    .offset(y: showHero ? 0 : 20)
 
                 // 最近作品或提示
                 if !recentWorks.recentWorks.isEmpty {
                     recentWorksSection
+                        .opacity(showRecentWorks ? 1 : 0)
+                        .offset(y: showRecentWorks ? 0 : 20)
                 } else {
                     emptyStateHint
+                        .opacity(showRecentWorks ? 1 : 0)
+                        .offset(y: showRecentWorks ? 0 : 20)
                 }
             }
             .padding(.horizontal, DesignTokens.Spacing.xl)
@@ -50,6 +58,12 @@ struct HomeView: View {
         }
         .onAppear {
             recentWorks.cleanupDeletedAssets()
+            withAnimation(DesignTokens.Animation.standard) {
+                showHero = true
+            }
+            withAnimation(DesignTokens.Animation.standard.delay(0.2)) {
+                showRecentWorks = true
+            }
         }
     }
 
@@ -304,13 +318,13 @@ struct RecentWorkCard: View {
                         Image(uiImage: thumbnail)
                             .resizable()
                             .aspectRatio(contentMode: .fill)
-                            .frame(width: 110, height: 150)
+                            .frame(width: 130, height: 178)
                             .clipShape(RoundedRectangle(cornerRadius: DesignTokens.Radius.md))
                             .transition(.opacity.combined(with: .scale(scale: 0.95)))
                     } else {
                         RoundedRectangle(cornerRadius: DesignTokens.Radius.md)
                             .fill(Color.softPressed)
-                            .frame(width: 110, height: 150)
+                            .frame(width: 130, height: 178)
                             .overlay {
                                 Image(systemName: "livephoto")
                                     .font(.system(size: 24))
@@ -329,7 +343,7 @@ struct RecentWorkCard: View {
                     }
                     .padding(DesignTokens.Spacing.sm)
                 }
-                .frame(width: 110, height: 150)
+                .frame(width: 130, height: 178)
 
                 // 信息
                 VStack(alignment: .leading, spacing: 2) {