Let the launcher icon catch up with the mark v2 already drew everywhere else

TitleBar and PhoneShell have drawn >_ knocked out of a solid accent tile since
v2, and both say in a comment that the launcher icon draws the same thing so the
three cannot drift. The launcher was still v1: an outlined square in the accent.
The comments are true now.

On Android the tile is the background layer rather than a rounded rectangle in
the foreground, because the rounding a launcher applies is its mask. Drawing the
tile would put a second rounded shape inside the mask, clipped at the corners on
any device whose mask is not the one it was drawn for; leaving it to the mask
gets a squircle on one device and a circle on another for free. Windows has no
mask, so dodossh.ico still draws its own corners.

The monochrome layer keeps only the glyph. A themed icon drops the background,
which is where the tile now lives, and a layer filled to the edges to stand in
for it would tint to a featureless square.

The glyph is half the width of the safe zone, taken from the two headers rather
than invented -- both set >_ a little under half the tile across. It is also
markedly more legible small than the outline was: dark on accent at 16px is a
mark, where a sub-pixel hairline was a smudge.

src/DodoSSH.Client.Android/Resources/drawable/ic_launcher_foreground.xml

@@ -1,25 +1,29 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-  The launcher mark, and it is the same mark ServerScreen and LockedScreen draw: a square
-  outline in the accent with >_ inside it. Redrawn as a vector rather than exported as a
-  bitmap so there is one geometry to change and no set of five PNG densities to forget one
-  of.
+  The launcher mark, and it is the same mark PhoneShell's header and the desktop titlebar draw:
+  >_ in the canvas colour on a solid accent tile. Filled rather than outlined since v2.
 
-  #5B8CFF is AccentColor from DodoSSH.Client.Shell's Theme/Palette.axaml, written out
-  because an Android resource cannot reference a XAML dictionary. The same duplication
-  colors.xml already carries for the window background, and the same rule applies: if the
-  palette moves, this moves with it.
+  The tile is not in this file. It is the background layer — @color/dodo_accent, see ic_launcher.xml
+  — and that is the whole trick of the filled design on Android: the rounding a launcher applies is
+  its mask, so letting the mask make the tile gets a squircle on one device and a circle on another
+  without either being drawn here. A rounded rectangle painted into this layer would be a second
+  rounded shape inside the first, visibly clipped at the corners on any device whose mask is not the
+  one it was drawn for.
 
-  108x108 with the artwork inside the middle 72 is the adaptive-icon contract — the outer
-  18 on each edge is what the launcher eats for masking and parallax. That 72 is a width,
-  though, and the mark is a square: its corners are what a circular mask reaches first. At
-  48 across the corners land 33.9 out against a radius of 36 and read as clipped even
-  though they technically clear it. 42 puts them at 29.7, which is margin one can see.
+  #0E1220 is AccentInk from DodoSSH.Client.Shell's Theme/Palette.axaml, written out because an
+  Android resource cannot reference a XAML dictionary. It equals Canvas today and is named
+  separately in the palette for a reason worth keeping in mind here: this is ink on the accent, not
+  the window behind it, and it follows AccentInk if the two ever part.
 
-  The stroke widths are the one place this deliberately departs from the screen. In the app
-  the box is a 1px border on 44px; scaled honestly that would be 1.0 here, and a launcher
-  drawing this at 48dp would render it at half a pixel and show nothing. 2.2 and 2.8 are
-  what keep it reading as the same hairline mark at the size it is actually looked at.
+  108x108 with the artwork inside the middle 72 is the adaptive-icon contract — the outer 18 on each
+  edge is what the launcher eats for masking and parallax. The glyph spans 36.06..71.94, which is
+  half the width of that 72 and centred in it. That half is taken from the headers rather than
+  invented: the phone draws >_ at font size 10 on a 26px tile and the titlebar at 9 on 20px, both a
+  little under half the tile across, and a launcher icon is looked at from further away than either.
+
+  The stroke width is the one place this deliberately departs from the screen. In the app the glyph
+  is a bold mono face whose stems come out near a fifth of its height; 5.4 here is nearer a quarter,
+  which is what keeps it reading as the same mark at the size it is actually looked at.
 -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
@@ -27,28 +31,21 @@
     android:viewportWidth="108"
     android:viewportHeight="108">
 
-  <!-- The box: 42 across, centred, square-cornered as the Border in the app is. -->
-  <path
-      android:pathData="M33,33 L75,33 L75,75 L33,75 Z"
-      android:fillColor="#00000000"
-      android:strokeColor="#5B8CFF"
-      android:strokeWidth="2.2" />
-
   <!-- The chevron of >_ -->
   <path
-      android:pathData="M44.8,48.75 L51.9,54 L44.8,59.25"
+      android:pathData="M36.06,43.33 L49.91,53.57 L36.06,63.8"
       android:fillColor="#00000000"
-      android:strokeColor="#5B8CFF"
-      android:strokeWidth="2.8"
+      android:strokeColor="#0E1220"
+      android:strokeWidth="5.4"
       android:strokeLineCap="round"
       android:strokeLineJoin="round" />
 
   <!-- The underscore, on the baseline the chevron bottoms out at. -->
   <path
-      android:pathData="M54,59.7 L63.2,59.7"
+      android:pathData="M54,64.68 L71.94,64.68"
       android:fillColor="#00000000"
-      android:strokeColor="#5B8CFF"
-      android:strokeWidth="2.8"
+      android:strokeColor="#0E1220"
+      android:strokeWidth="5.4"
       android:strokeLineCap="round" />
 
 </vector>