v1.15: new pixel-art tank launcher icon

Replace the hexagon "C" launcher icon with the tank-crushing-electronics
art. Adaptive icon (anydpi-v26): full art as foreground over teal
#284950 background, so it masks cleanly to any launcher shape; legacy
PNG bitmaps generated for all densities. Refreshes repo-root icon.png.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/src/main/res/mipmap-hdpi/ic_launcher.xml

@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@color/claude_orange" />
-    <foreground>
-        <inset
-            xmlns:android="http://schemas.android.com/apk/res/android"
-            android:drawable="@drawable/ic_launcher_fg"
-            android:inset="25%" />
-    </foreground>
-</adaptive-icon>

app/src/main/res/mipmap-hdpi/ic_launcher_round.xml

@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@color/claude_orange" />
-    <foreground>
-        <inset
-            xmlns:android="http://schemas.android.com/apk/res/android"
-            android:drawable="@drawable/ic_launcher_fg"
-            android:inset="25%" />
-    </foreground>
-</adaptive-icon>