Add missing themed icon support for android app icon.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Android app icon now supports a monochrome variant for adaptive icons,
enabling themed icons on compatible launchers.
* Improved icon consistency and visibility across system themes
(including dark mode).
* Applied to both standard and round launcher icons.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
750b008dc8