feat: 优化跨页选择和批量操作，默认每页10条，全选作用于全部匹配结果

apps/macos/VODManager/Sources/VODManager/Views/VideoListView.swift

@@ -12,11 +12,15 @@ struct VideoListView: View {
     @State private var showDownloadPanel = false
     @State private var downloadResults: [(video: VideoItem, playInfos: [PlayInfo])] = []
 
-    private let pageSizes = [20, 50, 100]
+    private let pageSizes = [10, 20, 50, 100]
     @State private var pageSizeIndex = 0
     private var pageSize: Int { pageSizes[pageSizeIndex] }
     @State private var pageNo = 1
     private var totalPages: Int { max(1, (filteredVideos.count + pageSize - 1) / pageSize) }
+    private var currentPageSelectedCount: Int {
+        let currentPageIds = Set(displayVideos.map(\.videoId))
+        return selectedVideos.intersection(currentPageIds).count
+    }
 
     var body: some View {
         VStack(spacing: 0) {
@@ -54,10 +58,10 @@ struct VideoListView: View {
                 .disabled(selectedVideos.isEmpty || isLoading)
 
                 Button("全选") {
-                    if selectedVideos.count == displayVideos.count {
+                    if selectedVideos.count == filteredVideos.count {
                         selectedVideos.removeAll()
                     } else {
-                        selectedVideos = Set(displayVideos.map(\.videoId))
+                        selectedVideos = Set(filteredVideos.map(\.videoId))
                     }
                 }
 
@@ -165,6 +169,15 @@ struct VideoListView: View {
             HStack {
                 Text("共 \(filteredVideos.count) 条，已选 \(selectedVideos.count) 个")
                     .foregroundStyle(.secondary)
+
+                if !selectedVideos.isEmpty {
+                    Button("取消选择") {
+                        selectedVideos.removeAll()
+                    }
+                    .buttonStyle(.borderless)
+                    .foregroundStyle(.secondary)
+                }
+
                 Spacer()
 
                 Picker("每页", selection: $pageSizeIndex) {
@@ -277,7 +290,7 @@ struct VideoListView: View {
         loadingStatus = ""
         var results: [(video: VideoItem, playInfos: [PlayInfo])] = []
         var errors: [String] = []
-        let selected = displayVideos.filter { selectedVideos.contains($0.videoId) }
+        let selected = filteredVideos.filter { selectedVideos.contains($0.videoId) }
         for (index, video) in selected.enumerated() {
             loadingStatus = "正在获取下载地址 (\(index + 1)/\(selected.count))「\(video.title)」..."
             let playInfos = await fetchPlayInfoWithRetry(videoId: video.videoId, title: video.title, maxRetries: 3)