Add setScreenAlwasyOn API to DisplayService

[jperedadnr]

Fixes #420

[Copilot]

Pull request overview

Adds a new DisplayService#setScreenAlwaysOn(boolean) API to control “keep screen on” behavior on supported platforms, addressing the requested functionality in #420.

Changes:

• Introduces setScreenAlwaysOn(boolean) in DisplayService.
• Implements the API on Android and iOS via new native/JNI bridges.
• Provides a desktop no-op implementation to satisfy the interface across platforms.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
modules/display/src/main/java/com/gluonhq/attach/display/DisplayService.java	Adds the public API and Javadoc for controlling “screen always on”.
modules/display/src/main/java/com/gluonhq/attach/display/impl/AndroidDisplayService.java	Wires lifecycle handling + JNI entrypoint for Android implementation.
modules/display/src/main/native/android/c/display.c	Adds JNI bridge from AndroidDisplayService into the Dalvik helper for setting the keep-screen-on flag.
modules/display/src/main/native/android/dalvik/DalvikDisplayService.java	Implements Android-side window flag toggling on the UI thread.
modules/display/src/main/java/com/gluonhq/attach/display/impl/IOSDisplayService.java	Adds lifecycle-aware state tracking and native call for iOS implementation.
modules/display/src/main/native/ios/Display.m	Implements iOS native toggle via UIApplication.idleTimerDisabled on the main queue.
modules/display/src/main/java/com/gluonhq/attach/display/impl/DesktopDisplayService.java	Adds a no-op implementation for desktop.

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