Social bar position is a click-toggle, not a drag — the drag-snap misbehaved for shaky hands (snapped up but wouldn't come back down; jitter around the deadzone). Clicking the bar now flips it top/bottom via ToggleSocialBarPosition; SocialBarSnap and its units removed — 153 tests passing, 0 warnings

MainWindow.xaml

@@ -654,13 +654,12 @@
 
                                     <!-- Social bar: one centered horizontal row at the top or bottom of
                                          the frame, green glow while enabled. Global resource — never a
-                                         Source, no Sources entry. Dragging snaps to the nearest edge. -->
+                                         Source, no Sources entry. Click toggles top ⇄ bottom. -->
                                     <Grid x:Name="SocialBarElement" Width="1920" Canvas.Top="{Binding SocialBarTop}"
                                           Background="Transparent"
                                           Visibility="{Binding SocialBarVisible, Converter={StaticResource BoolToVis}}"
-                                          PreviewMouseLeftButtonDown="SocialBar_PreviewMouseLeftButtonDown"
-                                          PreviewMouseMove="SocialBar_PreviewMouseMove"
-                                          PreviewMouseLeftButtonUp="SocialBar_PreviewMouseLeftButtonUp">
+                                          MouseLeftButtonDown="SocialBar_MouseLeftButtonDown"
+                                          Cursor="Hand">
                                         <Grid.Effect>
                                             <DropShadowEffect Color="{Binding SocialBarGlowBrush.Color}"
                                                               BlurRadius="18" ShadowDepth="0" Opacity="0.9"/>