Bring the last three outlined marks over to the filled tile

ServerScreen, LockedScreen and PendingScreen were the only places left drawing
v1: a 44px square outlined in the accent with >_ in the accent inside it. Every
other place the mark appears — both headers, the desktop titlebar, the launcher
icon and the .ico — draws it filled.

The radius is derived rather than chosen. The mark is 6 at 20 and 8 at 26, a
third of a unit per unit of tile, which puts 44 at exactly 14 — and 14 is
already on Phone.axaml's radius ladder as the one for a block of monospaced
output, which is a fair description of a box with >_ in it.

PendingScreen takes the shape and not the colour. It is the screen that says a
surface is not built yet, and the accent is the shell's one "do this" colour; a
tile in Raised with the glyph left at TextFaint keeps the mark recognisable
while the screen goes on looking as inert as it is.

src/DodoSSH.Client.Android/Views/PendingScreen.axaml

@@ -20,10 +20,17 @@
   <ScrollViewer>
     <StackPanel VerticalAlignment="Center" Margin="24,48" Spacing="12">
 
-      <Border Width="44" Height="44" BorderBrush="{StaticResource BorderMid}" BorderThickness="1"
+      <!--
+        The same filled tile the rest of the head draws since v2, at the same 44 and the same 14 — and
+        drained rather than recoloured. Accent on this screen would be the shell's one "this is what the
+        screen wants you to do" colour spent on the one screen that wants nothing, so the tile is Raised
+        and the glyph stays TextFaint. The shape says which application this is; the colour says the
+        screen is inert, which is the whole message.
+      -->
+      <Border Width="44" Height="44" CornerRadius="14" Background="{StaticResource Raised}"
               HorizontalAlignment="Left">
         <TextBlock Text="&gt;_" Foreground="{StaticResource TextFaint}" FontFamily="{StaticResource MonoFont}"
-                   FontSize="16" FontWeight="SemiBold"
+                   FontSize="16" FontWeight="Bold"
                    HorizontalAlignment="Center" VerticalAlignment="Center" />
       </Border>