Adjusts height of grid row

Sets a fixed height for the grid row to accommodate content within the dialog.

This ensures the layout is more predictable and prevents potential content overflow.

Author: Tomasz Solik

BusLane/Views/Dialogs/SendMessageDialog.axaml

@@ -12,7 +12,7 @@
                 HorizontalAlignment="Center"
                 Width="900"
                 MaxHeight="760">
-            <Grid RowDefinitions="Auto,Auto,*,Auto">
+            <Grid RowDefinitions="Auto,Auto,520,Auto">
                 <!-- Header -->
                 <Border Grid.Row="0"
                         Background="{DynamicResource SurfaceSubtle}"