App icon: winged-bubble adaptive icon (Android) + window/jpackage icon (desktop); concept art in app/icons/

app/desktopApp/build.gradle.kts

@@ -75,6 +75,7 @@ tasks.register<Exec>("jpackage") {
         "--input", inputDir.absolutePath,
         "--main-jar", "desktopApp-all.jar",
         "--main-class", "iris.desktop.MainKt",
+        "--icon", file("src/main/resources/icon.png").absolutePath,
         "--dest", destDir.absolutePath,
         "--java-options", "-Xmx1g",
     )