Upgrade to AGP 9.3.0 / Gradle 9.6.1

Android Studio staged this upgrade during a background sync
(previously uncommitted). Completing it properly:

- Drop the standalone kotlin-android plugin; AGP 9's built-in Kotlin
  compilation replaces it (the two conflict: "Cannot add extension
  with name 'kotlin'").
- Switch app/build.gradle to Groovy's '=' property-assignment syntax
  (the old bare 'propName value' form is deprecated, removed in
  Gradle 10).

Verified: assembleDebug, assembleRelease, and lintDebug all pass
clean with no warnings, and the release APK still verifies with the
same signing certificate as before (SHA-256 738b8440...), so it
remains a valid update path.

Author: roman-gmk

app/build.gradle

@@ -1,6 +1,5 @@
 plugins {
     id 'com.android.application'
-    id 'kotlin-android'
 }
 
 def keystoreProperties = new Properties()
@@ -10,44 +9,40 @@ if (keystorePropertiesFile.exists()) {
 }
 
 android {
-    namespace 'com.sleepbutton.app'
-    compileSdk 34
+    namespace = 'com.sleepbutton.app'
+    compileSdk = 34
 
     defaultConfig {
-        applicationId "com.sleepbutton.app"
-        minSdk 26          // Android 8.0 – TYPE_APPLICATION_OVERLAY is stable from here
-        targetSdk 34
-        versionCode 1
-        versionName "1.0"
+        applicationId = "com.sleepbutton.app"
+        minSdk = 26          // Android 8.0 – TYPE_APPLICATION_OVERLAY is stable from here
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
     }
 
     signingConfigs {
         release {
             if (keystorePropertiesFile.exists()) {
-                storeFile file(keystoreProperties['storeFile'])
-                storePassword keystoreProperties['storePassword']
-                keyAlias keystoreProperties['keyAlias']
-                keyPassword keystoreProperties['keyPassword']
+                storeFile = file(keystoreProperties['storeFile'])
+                storePassword = keystoreProperties['storePassword']
+                keyAlias = keystoreProperties['keyAlias']
+                keyPassword = keystoreProperties['keyPassword']
             }
         }
     }
 
     buildTypes {
         release {
-            minifyEnabled true
-            shrinkResources true
+            minifyEnabled = true
+            shrinkResources = true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
-            signingConfig signingConfigs.release
+            signingConfig = signingConfigs.release
         }
     }
 
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_17
-        targetCompatibility JavaVersion.VERSION_17
-    }
-
-    kotlinOptions {
-        jvmTarget = '17'
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 }
 

build.gradle

@@ -1,5 +1,4 @@
 // Top-level build file
 plugins {
-    id 'com.android.application' version '8.2.2' apply false
-    id 'org.jetbrains.kotlin.android' version '1.9.22' apply false
+    id 'com.android.application' version '9.3.0' apply false
 }

gradle/gradle-daemon-jvm.properties

@@ -0,0 +1,13 @@
+#This file is generated by updateDaemonJvm
+toolchainUrl.FREE_BSD.AARCH64=https\://api.foojay.io/disco/v3.0/ids/5b9591a15a17a2a590aa9c347d3c2cc0/redirect
+toolchainUrl.FREE_BSD.X86_64=https\://api.foojay.io/disco/v3.0/ids/b2464ba80c230a71ce5ddafc5fef6ac1/redirect
+toolchainUrl.LINUX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/5b9591a15a17a2a590aa9c347d3c2cc0/redirect
+toolchainUrl.LINUX.X86_64=https\://api.foojay.io/disco/v3.0/ids/b2464ba80c230a71ce5ddafc5fef6ac1/redirect
+toolchainUrl.MAC_OS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/8e3a8cffff6cb6225070c24826d27787/redirect
+toolchainUrl.MAC_OS.X86_64=https\://api.foojay.io/disco/v3.0/ids/b72dff7fe21ab8aef871517ef12a3667/redirect
+toolchainUrl.UNIX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/5b9591a15a17a2a590aa9c347d3c2cc0/redirect
+toolchainUrl.UNIX.X86_64=https\://api.foojay.io/disco/v3.0/ids/b2464ba80c230a71ce5ddafc5fef6ac1/redirect
+toolchainUrl.WINDOWS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/72d85c5e7c5049b9755b2c360b111cd5/redirect
+toolchainUrl.WINDOWS.X86_64=https\://api.foojay.io/disco/v3.0/ids/3ebfa4ecec5ee0165895f2bc0adf3ba9/redirect
+toolchainVendor=JETBRAINS
+toolchainVersion=17

gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,9 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
+networkTimeout=10000
+retries=0
+retryBackOffMs=500
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradle/wrapper/gradle-wrapper.properties

@@ -5,6 +5,9 @@ pluginManagement {
         gradlePluginPortal()
     }
 }
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '1.0.0'
+}
 dependencyResolutionManagement {
     repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
     repositories {