chore: configure :app module gradle build

Compose with Material 3 Expressive (1.5.0-alpha21 explicit override of
BOM stable), Hilt 2.59.2 + KSP 2.3.9, DataStore. Single-module project.
JVM 17 + Kotlin 2.3.21. JUnit Jupiter 6.1.0 unified (jupiter + platform).
testOptions opts into JUnit Platform so JUnit5/6 tests get discovered.

Note: kotlin-android plugin removed — AGP 9.0+ provides built-in Kotlin
support and the plugin now hard-errors when applied alongside AGP 9.x.
kotlin-compose plugin retained (separate Compose compiler plugin).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/.gitignore

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+/build

app/build.gradle.kts

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+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.ksp)
+    alias(libs.plugins.hilt)
+}
+
+android {
+    namespace = "de.jeanlucmakiola.calendula"
+    compileSdk = 36
+
+    defaultConfig {
+        applicationId = "de.jeanlucmakiola.calendula"
+        minSdk = 29
+        targetSdk = 36
+        versionCode = 1
+        versionName = "0.1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        vectorDrawables { useSupportLibrary = true }
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+        debug {
+            applicationIdSuffix = ".debug"
+            isMinifyEnabled = false
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    buildFeatures {
+        compose = true
+    }
+
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+
+    testOptions {
+        unitTests.all { it.useJUnitPlatform() }
+    }
+}
+
+kotlin {
+    compilerOptions {
+        jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.activity.compose)
+
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.ui)
+    implementation(libs.androidx.ui.graphics)
+    implementation(libs.androidx.ui.tooling.preview)
+    implementation(libs.androidx.material3)
+
+    implementation(libs.hilt.android)
+    ksp(libs.hilt.compiler)
+
+    implementation(libs.androidx.datastore.preferences)
+
+    debugImplementation(libs.androidx.ui.tooling)
+    debugImplementation(libs.androidx.ui.test.manifest)
+
+    testImplementation(libs.junit.jupiter.api)
+    testRuntimeOnly(libs.junit.jupiter.engine)
+    testRuntimeOnly(libs.junit.platform.launcher)
+    testImplementation(libs.truth)
+
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+    androidTestImplementation(platform(libs.androidx.compose.bom))
+    androidTestImplementation(libs.androidx.ui.test.junit4)
+}

app/proguard-rules.pro

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+# Keep Hilt-generated classes
+-keep class dagger.hilt.** { *; }
+-keep class * extends dagger.hilt.android.HiltAndroidApp
+
+# Compose Compiler may keep its own; defaults are fine
+-dontwarn org.jetbrains.annotations.**