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[AirStair]

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What I have done and why

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Fixes #<issue_number_goes_here>

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• Unit tests
• UI tests
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• Run local tests on DemoDebug variant: ./gradlew testDemoDebug
• Check formatting: ./gradlew --init-script gradle/init.gradle.kts spotlessApply

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• Import the code formatting style as explained in the setup script.

[google-cla]

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