some backend fixes and add android app

android/app/build.gradle.kts

@@ -0,0 +1,85 @@
+plugins {
+    // AGP 9 has built-in Kotlin support, so `org.jetbrains.kotlin.android` is gone;
+    // only the Compose compiler plugin is still applied explicitly.
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.kotlin.serialization)
+}
+
+android {
+    namespace = "tech.kadence.android"
+    compileSdk = libs.versions.compileSdk.get().toInt()
+
+    defaultConfig {
+        applicationId = "tech.kadence.android"
+        minSdk = libs.versions.minSdk.get().toInt()
+        targetSdk = libs.versions.targetSdk.get().toInt()
+        versionCode = 1
+        versionName = "0.1.0"
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        debug {
+            // So a debug build can sit beside a release one on the same phone.
+            applicationIdSuffix = ".debug"
+        }
+        release {
+            isMinifyEnabled = false
+        }
+    }
+
+    buildFeatures {
+        compose = true
+        buildConfig = true
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_21
+        targetCompatibility = JavaVersion.VERSION_21
+    }
+
+    testOptions {
+        unitTests.isIncludeAndroidResources = true
+    }
+
+    packaging {
+        resources.excludes += setOf("/META-INF/{AL2.0,LGPL2.1}")
+    }
+}
+
+dependencies {
+    // Every piece of logic worth testing lives here, and it has no Android dependency.
+    implementation(project(":core"))
+
+    implementation(libs.serialization.json)
+    implementation(libs.okhttp)
+
+    implementation(platform(libs.compose.bom))
+    implementation(libs.compose.ui)
+    implementation(libs.compose.ui.graphics)
+    implementation(libs.compose.foundation)
+    implementation(libs.compose.material3)
+    implementation(libs.compose.ui.tooling.preview)
+    debugImplementation(libs.compose.ui.tooling)
+
+    implementation(libs.activity.compose)
+    implementation(libs.navigation.compose)
+    implementation(libs.lifecycle.viewmodel.compose)
+    implementation(libs.lifecycle.runtime.compose)
+
+    // Robolectric runs these on the JVM, so the UI layer is verifiable without a
+    // device or an emulator — the same reason the logic lives in :core.
+    testImplementation(libs.junit)
+    testImplementation(libs.kotlin.test)
+    testImplementation(libs.robolectric)
+    testImplementation(libs.coroutines.test)
+    testImplementation(libs.mockwebserver)
+    testImplementation(platform(libs.compose.bom))
+    testImplementation(libs.compose.ui.test.junit4)
+    debugImplementation(libs.compose.ui.test.manifest)
+
+    androidTestImplementation(platform(libs.compose.bom))
+    androidTestImplementation(libs.compose.ui.test.junit4)
+    debugImplementation(libs.compose.ui.test.manifest)
+}