Fix OOM during build and add Compose previews to all screens

[Copilot]

Gradle build fails with java.lang.OutOfMemoryError: Java heap space due to missing JVM heap config. All screens also lack @Preview annotations, requiring a full project build to inspect UI.

OOM fix

Added JVM heap args to gradle.properties:

org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=512m -Dfile.encoding=UTF-8

Compose previews

• Added debugImplementation("androidx.compose.ui:ui-tooling") to build.gradle.kts
• Refactored all 11 screens to extract a stateless *Content composable that takes data/callbacks instead of NavController/GameViewModel, enabling @Preview without runtime dependencies
• The original *Screen composable remains as a thin wrapper; no navigation or game logic changed

// Before: only Screen composable, not previewable
@Composable
fun GameScreen(navController: NavController, viewModel: GameViewModel) { ... }

// After: Content composable is pure and previewable
@Composable
fun GameScreenContent(state: GameState, onAddClick: () -> Unit, ...) { ... }

@Preview(showBackground = true, showSystemUi = true)
@Composable
private fun GameScreenPreview() {
    PlagueTheme {
        GameScreenContent(state = GameState(...), onAddClick = {}, ...)
    }
}

Screens covered: HomeScreen, GameScreen, ShopScreen, PauseScreen, ResumeScreen, NewGameScreen, AboutScreen, GlobalStatsScreen, CurrentStatsScreen, VictoryScreen, DefeatScreen.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.google.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED -XX:MaxMetaspaceSize=512m -Xmx2048m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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