fix: Runtime error when starting background activity on Android 15

[Paitomax]

Description

This PR fixes a runtime error in HomeWidgetLaunchIntent when attempting to start a background activity on Android 15. Due to new system restrictions (as documented here), the configuration of pendingIntentBackgroundActivityStartMode needs to be handled differently depending on the Android version.

Checklist

• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation and added code (documentation) comments where necessary.
• I have updated/added relevant examples in example or documentation.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

Closes #303 #328

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[naamapps]

@ABausG
Please merge this PR, the package doesn't work on Android 15, and makes our apps crash.
Hope this can be handled soon.

[ABausG]

Couple of small questions only

[ABausG]

Looks good now!

Think the Pipeline is failing because of malformatted Koglin code
Can you run.

ktfmt .

(I have to fix the pipeline to actually report on the failing output step)

[ABausG]

Thank you for the fix and the collaboration on this 🫶