[Android] Use typed API 33 Parcelable overload

[jfversluis]

Note

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Summary

• use the type-safe Bundle.GetParcelable overload for WebAuthenticatorIntermediateActivity on Android API 33 and newer
• preserve the obsolete overload for Android API 21-32
• document why ActivationState must retain generic Bundle.Get access to preserve arbitrary value stringification
• remove obsolete and platform warning suppressions where the typed overload makes them unnecessary

Validation

• dotnet build src\Essentials\src\Essentials.csproj -f net10.0-android36.0 --no-restore --nologo -v:minimal — 0 warnings, 0 errors
• dotnet build src\Core\src\Core.csproj -f net10.0-android36.0 --no-restore --nologo -v:minimal — succeeded with only the existing Gradle Java 8 source/target warnings
• pwsh .github\skills\run-device-tests\scripts\Run-DeviceTests.ps1 -Project Essentials -Platform android -BuildOnly — succeeded and produced the signed APK

No Android emulator was available on the Windows validation host, so API 21-32 and API 33+ Activity recreation paths were not runtime-executed. The implementation follows the existing IntermediateActivity compatibility pattern.

[github-actions]

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[Copilot]

Copilot review overview

Review tier: Lite
Findings: 1

New issues introduced by this change (1)

Severity	Finding
	src/​Essentials/​src/​WebAuthenticator/​WebAuthenticatorIntermediateActivity.android.cs — OnCreate returns early when extras is null, but the activity will still proceed to OnResume,…

What changed in this PR

This PR updates Android-specific Bundle parcelable retrieval to use the API 33+ typed GetParcelable overload where available, while retaining legacy behavior for older Android versions, and clarifies why ActivationState intentionally keeps using the untyped Bundle.Get path.

Changes:

• Updated WebAuthenticatorIntermediateActivity to use the API 33+ Bundle.GetParcelable(string, Class) overload behind an OperatingSystem.IsAndroidVersionAtLeast(33) guard.
• Documented and refined the warning suppression around Bundle.Get usage in ActivationState to preserve existing stringification behavior for unknown Bundle value types.

File	Description
src/​Essentials/​src/​WebAuthenticator/​WebAuthenticatorIntermediateActivity.android.cs	Uses the API 33+ typed GetParcelable overload for safer parcelable retrieval on newer Android versions.
src/​Core/​src/​ActivationState.cs	Adds rationale for keeping untyped Bundle.Get access and updates the warning suppression to the explicit obsolete warning ID.