Upgrade AGP to 9.x (#892)

## Description
This PR has no user facing changes.

Upgrade AGP to 9.x and Gradle to 9.x. Also updates some dependencies as
well.

Note: still using deprecated `android.newDsl=false` because the protobuf
plugin is not yet compatible:
https://github.com/google/protobuf-gradle-plugin/issues/793.

### Related issues
N/A

### Testing
Emulator

## Screenshots
N/A

## AI or LLM usage
None

app/build.gradle.kts

@@ -7,7 +7,6 @@ import java.util.Properties
 
 plugins {
     alias(libs.plugins.android.application)
-    alias(libs.plugins.kotlin.android)
     alias(libs.plugins.ksp)
     alias(libs.plugins.kotlin.compose)
     alias(libs.plugins.hilt)
@@ -70,6 +69,7 @@ android {
     }
     kotlin {
         compilerOptions {
+            languageVersion = org.jetbrains.kotlin.gradle.dsl.KotlinVersion.KOTLIN_2_3
             jvmTarget = JvmTarget.JVM_11
             javaParameters = true
         }
@@ -150,7 +150,7 @@ android {
 
     sourceSets {
         getByName("main") {
-            kotlin.srcDirs("$buildDir/generated/seerr_api/src/main/kotlin")
+            kotlin.directories += "$buildDir/generated/seerr_api/src/main/kotlin"
         }
     }
 }

build.gradle.kts

@@ -1,7 +1,6 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
     alias(libs.plugins.android.application) apply false
-    alias(libs.plugins.kotlin.android) apply false
     alias(libs.plugins.kotlin.jvm) apply false
     alias(libs.plugins.protobuf) apply false
     alias(libs.plugins.ksp) apply false

gradle.properties

@@ -21,3 +21,13 @@ kotlin.code.style=official
 # resources declared in the library itself and none from the library's dependencies,
 # thereby reducing the size of the R class for that library
 android.nonTransitiveRClass=true
+android.defaults.buildfeatures.resvalues=false
+android.sdk.defaultTargetSdkToCompileSdkIfUnset=true
+android.enableAppCompileTimeRClass=true
+android.usesSdkInManifest.disallowed=true
+android.uniquePackageNames=true
+android.dependency.useConstraints=false
+android.r8.strictFullModeForKeepRules=true
+android.r8.optimizedResourceShrinking=true
+android.builtInKotlin=true
+android.newDsl=false

gradle/libs.versions.toml

@@ -1,20 +1,18 @@
 [versions]
 aboutLibraries = "13.2.1"
 acra = "5.13.1"
-agp = "8.13.2"
+agp = "9.0.1"
 auto-service = "1.1.1"
 autoServiceKsp = "1.2.0"
 desugar_jdk_libs = "2.1.5"
-hiltCompiler = "1.3.0"
 hiltNavigationCompose = "1.3.0"
 hiltWork = "1.3.0"
 kache = "2.1.1"
-kotlin = "2.3.0"
+kotlin = "2.3.10"
-kotlinxCoroutinesCore = "1.10.2"
 ksp = "2.3.5"
 coreKtx = "1.17.0"
 appcompat = "1.7.1"
-composeBom = "2026.01.01"
+composeBom = "2026.02.00"
 mockk = "1.14.9"
 robolectric = "4.16.1"
 multiplatformMarkdownRenderer = "0.39.2"
@@ -25,18 +23,18 @@ timber = "5.0.1"
 tvFoundation = "1.0.0-alpha12"
 tvMaterial = "1.0.1"
 lifecycleRuntimeKtx = "2.10.0"
-activityCompose = "1.12.3"
+activityCompose = "1.12.4"
 androidx-media3 = "1.9.2"
 coil = "3.3.0"
 jellyfin-sdk = "1.7.1"
-nav3Core = "1.0.0"
+nav3Core = "1.0.1"
 lifecycleViewmodelNav3 = "2.10.0"
 material3AdaptiveNav3 = "1.0.0-alpha03"
 protobuf = "0.9.6"
 datastore = "1.2.0"
 kotlinx-serialization = "1.10.0"
 protobuf-javalite = "4.33.5"
-hilt = "2.58"
+hilt = "2.59.1"
 room = "2.8.4"
 preferenceKtx = "1.2.1"
 tvprovider = "1.1.0"
@@ -83,7 +81,6 @@ hilt-android = { module = "com.google.dagger:hilt-android", version.ref = "hilt"
 hilt-android-compiler = { module = "com.google.dagger:hilt-android-compiler", version.ref = "hilt" }
 kache = { module = "com.mayakapps.kache:kache", version.ref = "kache" }
 kache-file = { module = "com.mayakapps.kache:file-kache", version.ref = "kache" }
-kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "kotlinxCoroutinesCore" }
 mockk-agent = { module = "io.mockk:mockk-agent", version.ref = "mockk" }
 mockk-android = { module = "io.mockk:mockk-android", version.ref = "mockk" }
 robolectric = { module = "org.robolectric:robolectric", version.ref = "robolectric" }
@@ -135,7 +132,6 @@ androidx-core-testing = { module = "androidx.arch.core:core-testing", version.re
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlin-plugin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.2.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME