Enable Kotlin 2.x Compose compiler plugin and remove legacy composeOptions

[hypermezo4-create]

Motivation

• The project uses Kotlin 2.x but the Compose compiler plugin was not registered or applied, leaving a legacy composeOptions setting that may conflict with the Kotlin 2.x Compose compiler plugin workflow.
• Align the Gradle configuration with the official Kotlin 2.x Compose plugin approach so Compose compilation uses the Kotlin plugin instead of an explicit kotlinCompilerExtensionVersion in the module.

Description

• Added id("org.jetbrains.kotlin.plugin.compose") version "2.0.21" apply false to the root build.gradle.kts to register the Compose compiler plugin using the repository's existing Kotlin version.
• Applied id("org.jetbrains.kotlin.plugin.compose") in app/build.gradle.kts so the app module uses the Kotlin 2.x Compose compiler plugin.
• Removed the legacy composeOptions { kotlinCompilerExtensionVersion = "1.5.15" } block from app/build.gradle.kts to avoid conflict with the plugin-based setup while keeping buildFeatures { compose = true } unchanged.
• Only build.gradle.kts and app/build.gradle.kts were modified; the GitHub Actions debug APK workflow and other CI files were left intact.

Testing

• Ran rg/search checks to confirm the plugin lines are present in build.gradle.kts and app/build.gradle.kts, which succeeded.
• Ran git diff/inspection to verify the expected changes are limited to build.gradle.kts and app/build.gradle.kts, which succeeded.
• Attempted ./gradlew :app:help to exercise Gradle, which failed because the environment is missing gradle/wrapper/gradle-wrapper.jar (environmental issue, not a code error).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
cavo	Ready	Preview, Comment	Apr 21, 2026 9:40pm