chore: upgrade Capacitor from v6 to v8.3.0

- Upgrade all @capacitor/* packages to v8
- Bump Android Gradle Plugin to 8.13.0, Gradle wrapper to 8.14.3
- Raise minSdkVersion to 24, compileSdk/targetSdk to 36
- Require JDK 21 and Node 22 in CI
- Add navigation|density to AndroidManifest configChanges
- Exclude duplicate kotlin-stdlib-jdk7/jdk8 modules
- Update google-services plugin to 4.4.4

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: RickyNotaro

.github/workflows/build-apk.yml

@@ -30,14 +30,14 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: npm
 
       - name: Setup Java
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
 
       - name: Setup Android SDK
         uses: android-actions/setup-android@v3

APK/android/app/capacitor.build.gradle

@@ -2,8 +2,8 @@
 
 android {
   compileOptions {
-      sourceCompatibility JavaVersion.VERSION_17
-      targetCompatibility JavaVersion.VERSION_17
+      sourceCompatibility JavaVersion.VERSION_21
+      targetCompatibility JavaVersion.VERSION_21
   }
 }
 

APK/android/app/src/main/AndroidManifest.xml

@@ -10,7 +10,7 @@
         android:theme="@style/AppTheme">
 
         <activity
-            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|smallestScreenSize|screenLayout|uiMode"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|smallestScreenSize|screenLayout|uiMode|navigation|density"
             android:name=".MainActivity"
             android:label="@string/title_activity_main"
             android:theme="@style/AppTheme.NoActionBarLaunch"

APK/android/build.gradle

@@ -7,8 +7,8 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.2.1'
-        classpath 'com.google.gms:google-services:4.4.0'
+        classpath 'com.android.tools.build:gradle:8.13.0'
+        classpath 'com.google.gms:google-services:4.4.4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -22,6 +22,13 @@ allprojects {
         google()
         mavenCentral()
     }
+    configurations.all {
+        // Kotlin 1.8+ merges jdk7/jdk8 into kotlin-stdlib; exclude the old
+        // standalone artifacts to avoid duplicate-class errors after the
+        // Capacitor 8 upgrade.
+        exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk7'
+        exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk8'
+    }
 }
 
 task clean(type: Delete) {

APK/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-all.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

APK/android/variables.gradle

@@ -1,16 +1,16 @@
 ext {
-    minSdkVersion = 22
-    compileSdkVersion = 34
-    targetSdkVersion = 34
+    minSdkVersion = 24
+    compileSdkVersion = 36
+    targetSdkVersion = 36
     androidxActivityVersion = '1.8.0'
     androidxAppCompatVersion = '1.6.1'
     androidxCoordinatorLayoutVersion = '1.2.0'
-    androidxCoreVersion = '1.12.0'
+    androidxCoreVersion = '1.13.0'
     androidxFragmentVersion = '1.6.2'
     coreSplashScreenVersion = '1.0.1'
     androidxWebkitVersion = '1.9.0'
     junitVersion = '4.13.2'
     androidxJunitVersion = '1.1.5'
     androidxEspressoCoreVersion = '3.5.1'
     cordovaAndroidVersion = '10.1.1'
-}
+}