android: refresh adaptive launcher icon

Add density-specific launcher PNGs with a new foreground, a monochrome
layer for themed icons, and a light background; drop the old vector
foreground.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

android/app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -1,10 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="108dp"
-    android:height="108dp"
-    android:viewportWidth="108"
-    android:viewportHeight="108">
-    <!-- Simple lightning bolt mark on the adaptive foreground safe zone. -->
-    <path
-        android:fillColor="#FFFFFF"
-        android:pathData="M60,28 L42,58 L54,58 L48,80 L70,48 L57,48 Z" />
-</vector>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@color/ic_launcher_background" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <foreground android:drawable="@mipmap/ic_launcher_foreground" />
+    <monochrome android:drawable="@mipmap/ic_launcher_monochrome" />
 </adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@color/ic_launcher_background" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <foreground android:drawable="@mipmap/ic_launcher_foreground" />
+    <monochrome android:drawable="@mipmap/ic_launcher_monochrome" />
 </adaptive-icon>

android/app/src/main/res/values/colors.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="ic_launcher_background">#519098</color>
+    <color name="ic_launcher_background">#F4FEF6</color>
 </resources>