Take half the room either side of the text in a log cell

The values sit closer to the line between the columns, and a column that
is as wide as its values is fifteen pixels narrower.

A header takes much more room besides its text than a cell does — its
own padding, and the room the theme keeps for the sort arrow — so the
two are now measured with an allowance each. One allowance for both
clipped "Mode" and "CQ-Zone" to the column width the values needed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0157i7PiZyqBkquxS9A6FTdQ

src/Nonemm.App/Windows/LogWindow.Columns.cs

@@ -19,8 +19,12 @@ namespace Nonemm.App.Windows;
 /// lasts as long as the window is open.
 public sealed partial class LogWindow
 {
-    /// What a cell takes either side of its text, in device pixels.
-    private const double CellPadding = 30;
+    /// What a cell takes besides its text, in device pixels.
+    private const double CellPadding = 15;
+
+    /// What a header takes besides its text: its own padding and the room the
+    /// theme keeps for the sort arrow, which is much more than a cell takes.
+    private const double HeaderPadding = 45;
 
     private readonly Dictionary<DataGridColumn, QsoColumn> columnOf = [];
     private IReadOnlyList<QsoColumn> shown = [];
@@ -185,8 +189,8 @@ public sealed partial class LogWindow
     /// theme's own font — so each is measured in the font it is drawn in.
     private static double WidthFor(QsoColumn column, DataGrid grid) =>
         Math.Max(
-            TextWidth(new string('0', column.Width + 1), grid.FontFamily, grid.FontSize),
-            TextWidth(column.Label + "0", FontFamily.Default, grid.FontSize)) + CellPadding;
+            TextWidth(new string('0', column.Width + 1), grid.FontFamily, grid.FontSize) + CellPadding,
+            TextWidth(column.Label + "0", FontFamily.Default, grid.FontSize) + HeaderPadding);
 
     private static double TextWidth(string text, FontFamily family, double size) =>
         new FormattedText(

src/Nonemm.App/Windows/LogWindow.axaml

@@ -12,6 +12,9 @@
         <Style Selector="DataGridCell TextBlock">
           <Setter Property="FontFamily" Value="monospace" />
           <Setter Property="FontSize" Value="12" />
+          <!-- half of what the theme leaves either side of the text, so more
+               columns fit across the window -->
+          <Setter Property="Margin" Value="6,0" />
         </Style>
         <!-- the theme gives a cell 32 pixels of height, which fits about a
              dozen rows on screen. The row is cut down to the height of its
@@ -37,7 +40,7 @@
           <Setter Property="FontSize" Value="12" />
           <Setter Property="MinHeight" Value="0" />
           <Setter Property="Margin" Value="0" />
-          <Setter Property="Padding" Value="12,0" />
+          <Setter Property="Padding" Value="6,0" />
           <Setter Property="BorderThickness" Value="0" />
           <Setter Property="VerticalContentAlignment" Value="Center" />
         </Style>