fix(blackbox): the timeline's labels on a narrow timeline, marks out of view, the cab on a short window

- The hover label and the clock bubble keep to the left edge on a
  narrow timeline instead of throwing in Render.
- A mark is told under the pointer only when it is drawn: within the
  plot and the time shown.
- The device groups are clipped at their own width, not 4 px short.
- On a short window the cab card scrolls, so the list above it keeps
  room for a few rows.

Eu07.BlackBox.Views/BlackBoxWindow.cs

@@ -174,9 +174,11 @@ public sealed class BlackBoxWindow : Window
         DockPanel.SetDock(_tabs, Dock.Top);
         side.Children.Add(_tabs);
         side.Children.Add(new Panel { Children = { _events, _timetableScroll, _summaryScroll } });
-        var cabCard = UiKit.Group(_strings["Cab"], _cab);
+        var cabCard = UiKit.Group(_strings["Cab"], new ScrollViewer { Content = _cab, HorizontalScrollBarVisibility = Avalonia.Controls.Primitives.ScrollBarVisibility.Disabled });
         cabCard.Margin = new Thickness(0, UiKit.Gap, 0, 0);
         var sideColumn = new DockPanel();
+        // On a short window the cab scrolls, so the list above keeps room for a few rows.
+        sideColumn.SizeChanged += (_, e) => cabCard.MaxHeight = Math.Max(160, e.NewSize.Height - 200);
         DockPanel.SetDock(cabCard, Dock.Bottom);
         sideColumn.Children.Add(cabCard);
         sideColumn.Children.Add(UiKit.Frame(side));

Eu07.BlackBox.Views/CabPanel.cs

@@ -163,7 +163,7 @@ public sealed class CabPanel : Control
         for (int g = 0; g < groups.Length; g++)
         {
             double groupWidth = Math.Max(20, widths[g] + spare);
-            using (context.PushClip(new Rect(x, top, groupWidth - 4, size.Height - top)))
+            using (context.PushClip(new Rect(x, top, groupWidth, size.Height - top)))
             {
                 context.DrawText(MapView.Text(Strings[groups[g].Title], Palette.DimText, 10, FontWeight.SemiBold), new Point(x, top));
                 double y = top + 16;

Eu07.BlackBox.Views/TimelineView.cs

@@ -127,7 +127,7 @@ public sealed class TimelineView : Control
             context.DrawLine(new Pen(Palette.Cursor, 1.5), new Point(cursor, Top - 6), new Point(cursor, size.Height - AxisHeight));
             // The moment played, on the axis.
             var clock = MapView.Text(recording.ClockAt(_time).ToString(@"hh\:mm\:ss", CultureInfo.InvariantCulture), Palette.Cursor, 10, FontWeight.SemiBold);
-            var bubble = new Rect(Math.Clamp(cursor - clock.Width / 2 - 5, Left, size.Width - Right - clock.Width - 10), size.Height - AxisHeight + 2,
+            var bubble = new Rect(Math.Max(Left, Math.Min(cursor - clock.Width / 2 - 5, size.Width - Right - clock.Width - 10)), size.Height - AxisHeight + 2,
                                   clock.Width + 10, clock.Height + 2);
             context.DrawRectangle(Palette.Card, new Pen(Palette.Cursor, 1), bubble);
             context.DrawText(clock, new Point(bubble.X + 5, bubble.Y + 1));
@@ -477,13 +477,16 @@ public sealed class TimelineView : Control
         double marks = chartBottom + 6 + Bands * (BandHeight + BandGap);
         bool inPlates = pointer.Y >= Top - 16 && pointer.Y <= Top - 2;
         bool inMarks = pointer.Y >= marks - 2 && pointer.Y <= marks + MarksHeight + 2;
-        if (!inPlates && !inMarks)
+        if (!inPlates && !inMarks || pointer.X < Left || pointer.X > Left + PlotWidth)
             return null;
+        double end = _start + PlotWidth * _secondsPerPixel;
         var culture = CultureInfo.CurrentCulture;
         string? found = null;
         double best = 5;
         void Consider(double time, Func<string> text)
         {
+            if (time < _start || time > end)
+                return;
             double d = Math.Abs(X(time) - pointer.X);
             if (d < best)
             {
@@ -533,7 +536,7 @@ public sealed class TimelineView : Control
         if (_pointer is not { } pointer)
             return;
         var label = MapView.Text(text, Palette.Text, 11);
-        double x = Math.Clamp(pointer.X + 10, Left, size.Width - Right - label.Width - 12);
+        double x = Math.Max(Left, Math.Min(pointer.X + 10, size.Width - Right - label.Width - 12));
         double y = Math.Max(2, pointer.Y - label.Height - 12);
         var box = new Rect(x, y, label.Width + 12, label.Height + 6);
         context.DrawRectangle(Palette.Card, new Pen(Palette.CardBorder, 1), box, 3, 3);