Retint the scrims to the v5 canvas, quick connect at the spec's 60%

Five scrim hardcodes still dimmed through the old canvas #0E1220; they
now sit on #05050A. Each keeps its alpha except QuickConnect's backdrop,
which the v5 spec pins at rgba(5,5,10,0.6) — its essay drops from 80% to
60% of Canvas to match.

src/DodoSSH.Client.App/Views/HostKeyCard.axaml

@@ -45,7 +45,7 @@
     80% of Canvas, written out because a scrim is a brush with an alpha and the palette holds no alpha
     variant of a surface; the pre-multiplied ones there are accent washes.
   -->
-  <Border Background="#CC0E1220">
+  <Border Background="#CC05050A">
     <Panel>
 
       <!-- ============ UNKNOWN HOST KEY ============ -->

src/DodoSSH.Client.App/Views/QuickConnect.axaml

@@ -27,9 +27,9 @@
     from "inside": a press anywhere on the card below reports that control as its source and bubbles through
     here on its way to the window.
   -->
-  <!-- 80% of Canvas. Written out because a scrim is a brush with an alpha, and the palette holds no alpha
+  <!-- 60% of Canvas. Written out because a scrim is a brush with an alpha, and the palette holds no alpha
        variant of a surface — see Palette.axaml, where the only pre-multiplied brushes are the accent washes. -->
-  <Border x:Name="Backdrop" Background="#CC0E1220" PointerPressed="OnBackdropPressed">
+  <Border x:Name="Backdrop" Background="#9905050A" PointerPressed="OnBackdropPressed">
     <Border Width="640" VerticalAlignment="Top" Margin="0,160,0,0"
             Background="{StaticResource Chrome}" BorderBrush="{StaticResource BorderMid}"
             BorderThickness="1" CornerRadius="14">