improve:计时器UI

Ink Canvas/Windows/SeewoStyleTimerWindow.xaml

@@ -412,7 +412,7 @@
                                                             Click="CommonTab_Click" 
                                                             Cursor="Hand" 
                                                             HorizontalAlignment="Left">
-                                                        <TextBlock Text="常用" FontSize="16" FontWeight="Bold" 
+                                                        <TextBlock x:Name="CommonTabText" Text="常用" FontSize="16" FontWeight="Bold" 
                                                                    Foreground="{DynamicResource SeewoTimerWindowButtonForeground}"/>
                                                     </Button>
                                                     <Button x:Name="RecentTabBtn" 
@@ -422,7 +422,7 @@
                                                             Click="RecentTab_Click" 
                                                             Cursor="Hand" 
                                                             HorizontalAlignment="Right">
-                                                        <TextBlock Text="最近" FontSize="16" FontWeight="Bold" 
+                                                        <TextBlock x:Name="RecentTabText" Text="最近" FontSize="16" FontWeight="Normal" 
                                                                    Foreground="{DynamicResource SeewoTimerWindowButtonForeground}"/>
                                                     </Button>
                                                 </Grid>

Ink Canvas/Windows/SeewoStyleTimerWindow.xaml.cs

@@ -566,6 +566,12 @@ namespace Ink_Canvas
             CommonTimersGrid.Visibility = Visibility.Visible;
             RecentTimersGrid.Visibility = Visibility.Collapsed;
             
+            // 更新字体粗细
+            var commonText = this.FindName("CommonTabText") as TextBlock;
+            var recentText = this.FindName("RecentTabText") as TextBlock;
+            if (commonText != null) commonText.FontWeight = FontWeights.Bold;
+            if (recentText != null) recentText.FontWeight = FontWeights.Normal;
+            
             // 移动指示器到左侧
             var indicator = this.FindName("SegmentedIndicator") as Border;
             if (indicator != null)
@@ -582,6 +588,12 @@ namespace Ink_Canvas
             CommonTimersGrid.Visibility = Visibility.Collapsed;
             RecentTimersGrid.Visibility = Visibility.Visible;
             
+            // 更新字体粗细
+            var commonText = this.FindName("CommonTabText") as TextBlock;
+            var recentText = this.FindName("RecentTabText") as TextBlock;
+            if (commonText != null) commonText.FontWeight = FontWeights.Normal;
+            if (recentText != null) recentText.FontWeight = FontWeights.Bold;
+            
             // 移动指示器到右侧
             var indicator = this.FindName("SegmentedIndicator") as Border;
             if (indicator != null)