New launcher icon from IconKitchen: adaptive icon layers now live in
mipmap-* (already padded for the safe zone, so the 16% inset wrapper is
gone) and the old drawable-* launcher layers are removed. assets/icon
sources updated to match; app_icon.png is the 512px Play Store icon.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
