Show tool tips at once and widen the bandmap carrier tick

The tool tip has no show delay and the theme's fade is removed. The
carrier tick reaches 30 px further to the right.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Nonemm.App/App.axaml

@@ -27,6 +27,10 @@
         <Style Selector="DataGrid">
             <Setter Property="ScrollViewer.AllowAutoHide" Value="False" />
         </Style>
+        <!-- the Fluent tool tip fades in and out; show it at once -->
+        <Style Selector="ToolTip">
+            <Setter Property="Transitions" Value="{x:Null}" />
+        </Style>
         <Style Selector="Window">
             <Setter Property="Background" Value="{DynamicResource FormBackground}" />
             <Setter Property="Foreground" Value="{DynamicResource FormForeground}" />

src/Nonemm.App/Windows/BandmapView.cs

@@ -29,6 +29,10 @@ public sealed class BandmapView : Control
     /// How far the carrier tick reaches past each side of the bar.
     private const double CarrierOverhang = 3;
 
+    /// How much further the carrier tick reaches to the right, so it can be
+    /// seen beside the callsign labels.
+    private const double CarrierExtraRight = 30;
+
     /// The scale stops short of the top and bottom edges so the first and last
     /// frequency numbers are not cut in half.
     private const double Inset = 9;
@@ -160,7 +164,7 @@ public sealed class BandmapView : Control
             double carrier = Math.Round(scale.YFor(vfo.Carrier) + Inset);
             context.FillRectangle(
                 brush,
-                new Rect(ScaleX - (VfoWidth / 2) - CarrierOverhang, carrier - 1, VfoWidth + (2 * CarrierOverhang), 2));
+                new Rect(ScaleX - (VfoWidth / 2) - CarrierOverhang, carrier - 1, VfoWidth + (2 * CarrierOverhang) + CarrierExtraRight, 2));
         }
     }
 
@@ -194,6 +198,7 @@ public sealed class BandmapView : Control
     protected override void OnPointerMoved(PointerEventArgs e)
     {
         base.OnPointerMoved(e);
+        ToolTip.SetShowDelay(this, 0);
         ToolTip.SetTip(
             this,
             LabelAt(e.GetPosition(this)) is { } label ? SpotDescription.Of(label.Spot) : null);