推荐页、视频页和动态页的卡片增加稍后再看按钮

src/Desktop/BiliCopilot.UI/Controls/Components/MomentCardControl/VideoMomentPresenter.xaml

@@ -93,6 +93,23 @@
                 Style="{StaticResource CaptionTextBlockStyle}"
                 Text="{x:Bind ViewModel.VideoDuration, Mode=OneWay}" />
         </Border>
+        <Button
+            x:Name="AddViewLaterButton"
+            Grid.Row="1"
+            Margin="8"
+            Padding="4,4"
+            HorizontalAlignment="Right"
+            VerticalAlignment="Top"
+            Style="{StaticResource VideoCardAddViewLaterButtonStyle}"
+            Command="{x:Bind ViewModel.AddToViewLaterCommand, Mode=OneWay}"
+            CornerRadius="{StaticResource ControlCornerRadius}"
+            Visibility="Collapsed">
+            <ic:SymbolIcon
+                    VerticalAlignment="Center"
+                    FontSize="12"
+                    Foreground="{ThemeResource TextOnAccentFillColorPrimaryBrush}"
+                    Symbol="Clock" />
+        </Button>
         <base:TrimTextBlock
             Grid.Row="2"
             HorizontalAlignment="Left"

src/Desktop/BiliCopilot.UI/Controls/Components/MomentCardControl/VideoMomentPresenter.xaml.cs

@@ -10,5 +10,35 @@ public sealed partial class VideoMomentPresenter : MomentCardPresenter
     /// <summary>
     /// Initializes a new instance of the <see cref="VideoMomentPresenter"/> class.
     /// </summary>
-    public VideoMomentPresenter() => InitializeComponent();
+    public VideoMomentPresenter()
+    {
+        InitializeComponent();
+        // Show/hide AddViewLaterButton on pointer enter/exit
+        this.PointerEntered += OnPointerEntered;
+        this.PointerExited += OnPointerExited;
+        this.Unloaded += OnUnloaded;
+    }
+
+    private void OnPointerEntered(object? sender, Microsoft.UI.Xaml.Input.PointerRoutedEventArgs e)
+    {
+        if (AddViewLaterButton is not null)
+        {
+            AddViewLaterButton.Visibility = Microsoft.UI.Xaml.Visibility.Visible;
+        }
+    }
+
+    private void OnPointerExited(object? sender, Microsoft.UI.Xaml.Input.PointerRoutedEventArgs e)
+    {
+        if (AddViewLaterButton is not null)
+        {
+            AddViewLaterButton.Visibility = Microsoft.UI.Xaml.Visibility.Collapsed;
+        }
+    }
+
+    private void OnUnloaded(object? sender, Microsoft.UI.Xaml.RoutedEventArgs e)
+    {
+        this.PointerEntered -= OnPointerEntered;
+        this.PointerExited -= OnPointerExited;
+        this.Unloaded -= OnUnloaded;
+    }
 }