New app icon: Radar Eye (adaptive + themed monochrome)

Replaces the inherited OVERWATCH shield with VIGIL's own mark: a watchful eye with a radar-target iris and a green centre contact, in Catppuccin Mocha. Foreground vector (safe-zone sized) + radial-gradient background layer + monochrome layer for Android 13+ themed icons. Release 0.1.6.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0187UiEtasyowhEBYs6s9iF5

app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Mocha radial ground: a subtle lift toward the top-centre, falling to crust. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M0,0h108v108h-108z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:type="radial"
+                android:centerX="54"
+                android:centerY="42"
+                android:gradientRadius="82"
+                android:startColor="#2A2A40"
+                android:endColor="#11111B" />
+        </aapt:attr>
+    </path>
+</vector>