fix: correct tooling versions (Gradle 9.5.1, AGP 8.13.2) and add Kotlin Compose plugin

- AGP 2.1.3 doesn't exist; use 8.13.2 (latest stable 8.x)
- Gradle 9.6.1 incompatible with AGP 8.x; use 9.5.1
- Add org.jetbrains.kotlin.plugin.compose (required since Compose MP 1.6.10)
- Fix source set access (by getting) and iOS Darwin dependency injection
- Remove instrumentedTestVariant (KotlinSourceSetTree unresolved)

build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     alias(libs.plugins.kotlin.multiplatform) apply false
+    alias(libs.plugins.kotlin.compose) apply false
     alias(libs.plugins.compose.multiplatform) apply false
     alias(libs.plugins.kotlin.serialization) apply false
     alias(libs.plugins.android.application) apply false

composeApp/build.gradle.kts

@@ -1,9 +1,9 @@
 import org.jetbrains.compose.desktop.application.dsl.TargetFormat
-import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 plugins {
     alias(libs.plugins.kotlin.multiplatform)
+    alias(libs.plugins.kotlin.compose)
     alias(libs.plugins.compose.multiplatform)
     alias(libs.plugins.kotlin.serialization)
     alias(libs.plugins.android.application)
@@ -11,8 +11,6 @@ plugins {
 
 kotlin {
     androidTarget {
-        @OptIn(ExperimentalKotlinGradlePluginApi::class)
-        instrumentedTestVariant.sourceSetTree.set(KotlinSourceSetTree.test)
         compilations.all {
             compileTaskProvider.configure {
                 compilerOptions.jvmTarget.set(JvmTarget.JVM_11)
@@ -20,12 +18,15 @@ kotlin {
         }
     }
 
-    listOf(iosX64(), iosArm64(), iosSimulatorArm64())
+    iosX64()
+    iosArm64()
+    iosSimulatorArm64()
 
     jvm("desktop")
 
     sourceSets {
-        commonMain.dependencies {
+        val commonMain by getting {
+            dependencies {
                 implementation(compose.runtime)
                 implementation(compose.foundation)
                 implementation(compose.material3)
@@ -39,26 +40,39 @@ kotlin {
                 implementation(libs.multiplatform.settings.no.arg)
                 implementation(libs.lifecycle.viewmodel.compose)
             }
-        commonTest.dependencies {
+        }
+        val commonTest by getting {
+            dependencies {
                 implementation(kotlin("test"))
                 implementation(libs.ktor.client.mock)
                 implementation(libs.kotlinx.coroutines.test)
                 implementation(libs.multiplatform.settings.test)
             }
-        androidMain.dependencies {
+        }
+        val androidMain by getting {
+            dependencies {
                 implementation(libs.ktor.client.cio)
                 implementation(libs.androidx.activity.compose)
             }
-        iosMain.dependencies {
-            implementation(libs.ktor.client.darwin)
         }
-        desktopMain.dependencies {
+        val desktopMain by getting {
+            dependencies {
                 implementation(libs.ktor.client.cio)
                 implementation(compose.desktop.currentOs)
             }
         }
     }
 
+    // Darwin engine for all iOS targets
+    targets.filterIsInstance<org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget>()
+        .filter { it.konanTarget.family == org.jetbrains.kotlin.konan.target.Family.IOS }
+        .forEach { target ->
+            target.compilations.getByName("main").dependencies {
+                implementation(libs.ktor.client.darwin)
+            }
+        }
+}
+
 android {
     namespace = "ch.parano.myice"
     compileSdk = 35

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 kotlin = "2.2.20"
 compose-multiplatform = "1.11.1"
-agp = "2.1.3"
+agp = "8.13.2"
 ktor = "3.5.1"
 kotlinx-serialization-json = "1.11.0"
 kotlinx-coroutines = "1.11.0"
@@ -27,6 +27,7 @@ androidx-activity-compose = { module = "androidx.activity:activity-compose", ver
 
 [plugins]
 kotlin-multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
+kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 compose-multiplatform = { id = "org.jetbrains.compose", version.ref = "compose-multiplatform" }
 kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
 android-application = { id = "com.android.application", version.ref = "agp" }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.5.1-bin.zip
 networkTimeout=10000
 retries=0
 retryBackOffMs=500