Add AdChoices icon to about banner ad

[MihaiCristianCondrea]

Summary

• add an AdChoices view to the about screen native ad layout so the "Why this ad" icon can render
• wire the ad loader to register the AdChoices view with the native ad view

Testing

• ./gradlew test (fails: Android SDK is not available in the container environment)

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https://chatgpt.com/codex/tasks/task_e_68cdcd01038c832dacc5f2ed5793bce1

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

[P1] Reserve space for the AdChoices icon

The newly added AdChoicesView is anchored to the top-right of the constraint layout, but ad_headline still stretches all the way to parent (app:layout_constraintEnd_toEndOf="parent"). With no constraint or margin between these two views the headline text will occupy the same space as the AdChoices icon, so whichever view is drawn last will obscure the other. AdChoices must remain visible for policy compliance, so the headline should constrain to the start of @id/ad_choices (or similar) to avoid overlap.

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