Fix/exhaustive when

[NWuensche]

Task/Issue URL: /

Description

Optimize when-clauses by removing cases that can never happen (sealed classes - else cases as well as java - null interop type)

Steps to test this PR

• Compile the app

UI changes

None

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Note

Low Risk
Low risk cleanup to make when expressions exhaustive and remove dead/default branches; behavior should be unchanged aside from always acknowledging processed commands in Autofill screens.

Overview
Cleans up multiple when statements (design system, Autofill, VPN exclusions, PIR state handlers, subscriptions feedback, and Gradle ModuleType) by removing unreachable else/no-op branches and relying on Kotlin exhaustiveness.

In Autofill command handling (AutofillManagementActivity and AutofillManagementCredentialsMode), the processed-command logging and viewModel.commandProcessed call are now unconditional after the when, aligning with the assumption that commands are fully covered.

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