fix: handle exercise configuration changes

[arpitagarwal1301]

What

Declare the size and orientation configuration changes handled by ExerciseSampleCompose's MainActivity.

Why

MainActivity hosts a Compose UI, which can recompose for size-based configuration changes without recreating the activity. Avoiding recreation helps retain the ongoing exercise UI and activity-scoped state through those changes.

How

Add the size-specific configuration set from the current Android guidance:

android:configChanges="screenSize|smallestScreenSize|orientation|screenLayout"

Fixes #329

Validation

• XML parsing and git diff --check
• :app:processDebugMainManifest
• :app:testDebugUnitTest
• :app:verifyRoborazziDebug
• :app:assembleDebug
• packaged-manifest inspection with aapt2 confirmed config mask 0x0d80

The local repository's Spotless and lint checks currently fail on pre-existing Kotlin/test formatting and indentation findings outside this XML-only change. A Wear runtime check was not available because no Wear system image or AVD is installed locally.

AI disclosure

This focused manifest correction was prepared and independently reviewed with AI assistance.

[gemini-code-assist]

Code Review

This pull request updates the AndroidManifest.xml file in the ExerciseSampleCompose application to add the configChanges attribute (handling screenSize, smallestScreenSize, orientation, and screenLayout) to MainActivity. This prevents the activity from being restarted during these configuration changes. There are no review comments, and we have no additional feedback to provide.

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