Add the native Hesychia Android client so the repo can build beyond the placeholder README.

app/build.gradle.kts

@@ -0,0 +1,156 @@
+import java.io.FileInputStream
+import java.util.Properties
+
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+    id("org.jetbrains.kotlin.plugin.compose")
+    id("org.jetbrains.kotlin.plugin.serialization")
+    id("com.google.dagger.hilt.android")
+    id("com.google.devtools.ksp")
+}
+
+val keystorePropertiesFile = rootProject.file("keystore.properties")
+val keystoreProperties = Properties()
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
+}
+
+android {
+    namespace = "ai.hesychia.chat"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "ai.hesychia.chat"
+        minSdk = 23
+        targetSdk = 35
+        versionCode = 1
+        versionName = "0.1.0"
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+
+        buildConfigField("String", "REVENUECAT_GOOGLE_API_KEY", "\"\"")
+        buildConfigField("String", "REVENUECAT_OFFERING_ID", "\"\"")
+    }
+
+    signingConfigs {
+        create("release") {
+            if (keystorePropertiesFile.exists()) {
+                keyAlias = keystoreProperties["keyAlias"] as String
+                keyPassword = keystoreProperties["keyPassword"] as String
+                storeFile = file(keystoreProperties["storeFile"] as String)
+                storePassword = keystoreProperties["storePassword"] as String
+            }
+        }
+    }
+
+    flavorDimensions += "env"
+    productFlavors {
+        create("prod") {
+            dimension = "env"
+            isDefault = true
+            buildConfigField(
+                "String",
+                "REST_API_BASE_URL",
+                "\"https://backend.hesychia.ai/api/\"",
+            )
+            buildConfigField(
+                "String",
+                "WS_API_BASE_URL",
+                "\"wss://backend.hesychia.ai/ws/chat_again/\"",
+            )
+        }
+        create("beta") {
+            dimension = "env"
+            applicationIdSuffix = ".beta"
+            versionNameSuffix = "-beta"
+            buildConfigField(
+                "String",
+                "REST_API_BASE_URL",
+                "\"https://beta.backend.hesychia.ai/api/\"",
+            )
+            buildConfigField(
+                "String",
+                "WS_API_BASE_URL",
+                "\"wss://beta.backend.hesychia.ai/ws/chat_again/\"",
+            )
+        }
+    }
+
+    buildTypes {
+        debug {
+            applicationIdSuffix = ".debug"
+            versionNameSuffix = "-debug"
+        }
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro",
+            )
+            if (keystorePropertiesFile.exists()) {
+                signingConfig = signingConfigs.getByName("release")
+            }
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+    buildFeatures {
+        compose = true
+        buildConfig = true
+    }
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+}
+
+dependencies {
+    val composeBom = platform("androidx.compose:compose-bom:2024.12.01")
+    implementation(composeBom)
+    androidTestImplementation(composeBom)
+
+    implementation("androidx.core:core-ktx:1.15.0")
+    implementation("androidx.activity:activity-compose:1.9.3")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.7")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.8.7")
+    implementation("androidx.lifecycle:lifecycle-runtime-compose:2.8.7")
+    implementation("androidx.navigation:navigation-compose:2.8.5")
+    implementation("androidx.datastore:datastore-preferences:1.1.1")
+    implementation("androidx.browser:browser:1.8.0")
+    implementation("io.coil-kt:coil-compose:2.7.0")
+    implementation("androidx.security:security-crypto:1.1.0-alpha06")
+
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.ui:ui-tooling-preview")
+    implementation("androidx.compose.material3:material3")
+    implementation("androidx.compose.material:material-icons-extended")
+    debugImplementation("androidx.compose.ui:ui-tooling")
+
+    implementation("com.google.dagger:hilt-android:2.53.1")
+    ksp("com.google.dagger:hilt-compiler:2.53.1")
+    implementation("androidx.hilt:hilt-navigation-compose:1.2.0")
+
+    implementation("com.squareup.okhttp3:okhttp:4.12.0")
+    implementation("com.squareup.okhttp3:logging-interceptor:4.12.0")
+    implementation("com.squareup.retrofit2:retrofit:2.11.0")
+    implementation("com.jakewharton.retrofit:retrofit2-kotlinx-serialization-converter:1.0.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.3")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.9.0")
+
+    implementation("com.android.billingclient:billing-ktx:7.1.1")
+    // RevenueCat — wire keys via BuildConfig / local.properties later (Workstream E)
+    implementation("com.revenuecat.purchases:purchases:8.12.2")
+
+    testImplementation("junit:junit:4.13.2")
+    testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.9.0")
+    testImplementation("com.google.truth:truth:1.4.4")
+    androidTestImplementation("androidx.test.ext:junit:1.2.1")
+    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
+}