build(deps): bump Flutter pin to 3.47.0 and Android Gradle stack

Pin Flutter 3.47.0 (Dart 3.13) as the CI source of truth and move the
Android toolchain to the 3.47 template versions: Gradle 9.3.1, AGP 9.1.0,
Kotlin 2.4.0.

App Gradle script matches the 3.47 template (drop kotlin-android /
kotlinOptions, use compilerOptions). Keep android.builtInKotlin=false and
android.newDsl=false so plugins that still apply KGP keep building.

AGP 9 requires libraries to compile against their dependencies' compileSdk;
force plugin modules to 36 via finalizeDsl. Ignore android/build/, which
AGP 9 now writes a problems report into.

analyze, test, and a release APK all passed. 16 KB zip alignment verified.

iOS UIScene is not in this commit: AppDelegate is customized
(CookieExtractorPlugin), so Flutter will not auto-migrate.

.gitignore

@@ -44,6 +44,8 @@ app.*.map.json
 /android/app/debug
 /android/app/profile
 /android/app/release
+# AGP 9 writes a problems report here even when the Gradle build dir is redirected
+/android/build/
 
 # Folder containing random testing files
 random/

analysis_options.yaml

@@ -16,6 +16,9 @@ analyzer:
     - ios/**
     - android/**
     - web/**
+    - windows/**
+    - macos/**
+    - linux/**
 
 linter:
   # The lint rules applied to this project can be customized in the

android/app/build.gradle.kts

@@ -6,7 +6,6 @@ plugins {
     id("com.google.gms.google-services")
     id("com.google.firebase.firebase-perf")
     id("com.google.firebase.crashlytics")
-    id("kotlin-android")
     // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id("dev.flutter.flutter-gradle-plugin")
 }
@@ -27,10 +26,6 @@ android {
         targetCompatibility = JavaVersion.VERSION_17
     }
 
-    kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_17.toString()
-    }
-
     defaultConfig {
         applicationId = "com.tommychow.frosty"
         minSdk = flutter.minSdkVersion
@@ -64,6 +59,12 @@ android {
     }
 }
 
+kotlin {
+    compilerOptions {
+        jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
+    }
+}
+
 flutter {
     source = "../.."
 }

android/build.gradle.kts

@@ -1,3 +1,5 @@
+import com.android.build.api.variant.LibraryAndroidComponentsExtension
+
 allprojects {
     repositories {
         google()
@@ -19,6 +21,17 @@ subprojects {
     project.evaluationDependsOn(":app")
 }
 
+// AGP 9 requires each library to compile against at least the compileSdk of
+// its dependencies. Several Flutter plugins still pin compileSdk 33/34.
+// finalizeDsl runs after the plugin's android {} block. Does not change minSdk.
+subprojects {
+    pluginManager.withPlugin("com.android.library") {
+        extensions.configure<LibraryAndroidComponentsExtension>("androidComponents") {
+            finalizeDsl { it.compileSdk = 36 }
+        }
+    }
+}
+
 tasks.register<Delete>("clean") {
     delete(rootProject.layout.buildDirectory)
 }

android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-all.zip

android/settings.gradle.kts

@@ -18,8 +18,8 @@ pluginManagement {
 
 plugins {
     id("dev.flutter.flutter-plugin-loader") version "1.0.0"
-    id("com.android.application") version "8.11.1" apply false
-    id("org.jetbrains.kotlin.android") version "2.2.20" apply false
+    id("com.android.application") version "9.1.0" apply false
+    id("org.jetbrains.kotlin.android") version "2.4.0" apply false
     id("com.google.gms.google-services") version "4.4.4" apply false
     id("com.google.firebase.firebase-perf") version "2.0.2" apply false
     id("com.google.firebase.crashlytics") version "3.0.6" apply false

pubspec.lock

@@ -814,10 +814,10 @@ packages:
     dependency: transitive
     description:
       name: matcher
-      sha256: dc0b7dc7651697ea4ff3e69ef44b0407ea32c487a39fff6a4004fa585e901861
+      sha256: "31bd099b47c10cd1aeb55146a2d46ce0277630ecef3f7dae54ad7873f36696cd"
       url: "https://pub.dev"
     source: hosted
-    version: "0.12.19"
+    version: "0.12.20"
   material_color_utilities:
     dependency: transitive
     description:
@@ -830,10 +830,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: "1741988757a65eb6b36abe716829688cf01910bbf91c34354ff7ec1c3de2b349"
+      sha256: "307249ce4ff29d58a18e97f6345f539382eb9c9c29ecda628900f31de0443dd9"
       url: "https://pub.dev"
     source: hosted
-    version: "1.18.0"
+    version: "1.19.0"
   mime:
     dependency: transitive
     description:
@@ -1284,10 +1284,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "949a932224383300f01be9221c39180316445ecb8e7547f70a41a35bf421fb9e"
+      sha256: "2a122cbe059f8b610d3a5415f42e255b6c17b1f21eee1d960f31080237fb4f11"
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.11"
+    version: "0.7.12"
   typed_data:
     dependency: transitive
     description:
@@ -1404,10 +1404,10 @@ packages:
     dependency: transitive
     description:
       name: vector_math
-      sha256: d530bd74fea330e6e364cda7a85019c434070188383e1cd8d9777ee586914c5b
+      sha256: f36f9f3be64c6198714492bb455c11056e33e2f85d9a0b676a48301e44fdcf47
       url: "https://pub.dev"
     source: hosted
-    version: "2.2.0"
+    version: "2.4.2"
   vm_service:
     dependency: transitive
     description:
@@ -1538,4 +1538,4 @@ packages:
     version: "3.1.3"
 sdks:
   dart: ">=3.12.0 <4.0.0"
-  flutter: "3.44.9"
+  flutter: "3.47.0"

pubspec.yaml

@@ -23,7 +23,7 @@ environment:
   sdk: ^3.9.0
   # Exact Flutter pin, enforced by `flutter pub get` locally and read by CI via
   # `flutter-version-file: pubspec.yaml`. Single source of truth: bump here.
-  flutter: 3.44.9
+  flutter: 3.47.0
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions