Enable passkey authentication

[malkoG]

Summary

Enable the passkey authentication feature flag so passkey support is active in the Android client. On Android 9 and newer, this exposes passkey sign-in on the username step and the passkeys management section in Settings; older devices continue using the existing email verification flow.

Why

• Make the shipped passkey flow available behind the existing platform gate.
• Keep behavior unchanged on devices that do not support the Credentials API requirement.

Before and After

Before	After
Passkey auth stayed hidden because PASSKEY_AUTH_ENABLED was false.	Passkey auth is enabled on Android 9+ where the UI already gates support.
Settings did not expose passkey management.	Settings shows passkey listing, add, and revoke actions on supported devices.

Commit History

• d20dd0a Enable passkey authentication: Turn on the passkey feature flag and expose the existing passkey sign-in and settings management flows on supported Android versions.

Test Plan

• Run ./gradlew :app:lintDebug
• On an Android 9+ device or emulator, confirm the username sign-in screen shows the passkey action.
• On an Android 9+ device or emulator, confirm Settings shows passkey management and existing add/remove flows still work.
• On an Android 8.1 or lower device or emulator, confirm the app still uses the email verification flow without passkey UI.

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Assisted-By: Codex(gpt-5)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 42002522-b117-41ba-92b3-51afe8a5ca1e

📥 Commits

Reviewing files that changed from the base of the PR and between 4126f5f and d20dd0a.

📒 Files selected for processing (1)

• app/src/main/java/pub/hackers/android/FeatureFlags.kt

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