chore(android): update app icons and add monochrome support

This commit updates the Android application icons across various densities and introduces a dedicated monochrome resource for adaptive icons to improve compatibility with themed icons.

- **chore(android)**: Updated `ic_launcher` and `ic_launcher_round` webp assets for hdpi, mdpi, xhdpi, xxhdpi, and xxxhdpi densities.
- **chore(android)**: Updated `ic_launcher-playstore.png` asset.
- **chore(android)**: Modified `ic_launcher.xml` and `ic_launcher_round.xml` to use `@drawable/ic_launcher_monochrome` for the monochrome layer.

Author: rainxchzed

composeApp/src/androidMain/ic_launcher-playstore.png

@@ -2,5 +2,5 @@
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@color/ic_launcher_background"/>
     <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-    <monochrome android:drawable="@mipmap/ic_launcher_foreground"/>
+    <monochrome android:drawable="@drawable/ic_launcher_monochrome"/>
 </adaptive-icon>

composeApp/src/androidMain/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -2,5 +2,5 @@
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@color/ic_launcher_background"/>
     <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-    <monochrome android:drawable="@mipmap/ic_launcher_foreground"/>
+    <monochrome android:drawable="@drawable/ic_launcher_monochrome"/>
 </adaptive-icon>