Cleanup and rework build logic (#3113)

source-local/build.gradle.kts

@@ -1,22 +1,26 @@
 import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
 
 plugins {
-    id("mihon.library")
-    kotlin("multiplatform")
+    alias(mihonx.plugins.kotlin.multiplatform)
+    alias(mihonx.plugins.spotless)
 }
 
 kotlin {
-    androidTarget()
-    sourceSets {
-        val commonMain by getting {
-            dependencies {
-                implementation(projects.sourceApi)
-                api(projects.i18n)
+    android {
+        namespace = "tachiyomi.source.local"
+    }
 
-                implementation(libs.unifile)
-            }
-        }
-        val androidMain by getting {
+    @OptIn(ExperimentalKotlinGradlePluginApi::class)
+    @Suppress("UnstableApiUsage")
+    dependencies {
+        implementation(projects.sourceApi)
+        api(projects.i18n)
+
+        implementation(libs.unifile)
+    }
+
+    sourceSets {
+        androidMain {
             dependencies {
                 implementation(projects.core.archive)
                 implementation(projects.core.common)
@@ -38,12 +42,3 @@ kotlin {
         )
     }
 }
-
-android {
-    namespace = "tachiyomi.source.local"
-
-    defaultConfig {
-        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
-        consumerProguardFiles("consumer-rules.pro")
-    }
-}

source-local/proguard-rules.pro

@@ -1,21 +0,0 @@
-# Add project specific ProGuard rules here.
-# You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
-
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
-
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile