feat(samples/android): native Android login-pkce sample

[ksroda-sa]

Summary

• Adds the first native Android sample at samples/android/login-pkce/, implementing the mobile_login_pkce scenario feature-parallel with samples/ios/login-pkce/ and samples/react-native/login-pkce/.
• Stack: Kotlin + Jetpack Compose + AppAuth-Android; project uses a Gradle version catalog with the latest stable libs (AGP 9.x, Kotlin 2.3.x, Compose BOM, AppAuth 0.11.x, Gradle 9.x).
• Snippet tags step1–step3 mirror the React Native / iOS samples so dashboard step tabs line up.
• 13 JVM unit tests passing: 5 IDToken + 3 AuthExpiry + 5 AuthConfig.
• extract-snippets.ts extended to read the AppAuth version from gradle/libs.versions.toml for the aggregated manifest.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a new native Android (Kotlin + Jetpack Compose + AppAuth-Android) login with Authorization Code + PKCE sample and wires it into the repository’s snippet/manifest generation so the mobile login scenario is represented across Android/iOS/React Native.

Changes:

• Introduces samples/android/login-pkce/ including AppAuth-driven login/logout, token expiry handling, and JVM unit tests.
• Extends snippet aggregation to support Android Gradle Version Catalogs (gradle/libs.versions.toml) for library version extraction.
• Updates aggregated scenario/framework manifests and snippet outputs to include Android under mobile_login_pkce.

Reviewed changes

Copilot reviewed 28 out of 30 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
snippets.json	Adds Android snippets for mobile_login_pkce and reorganizes existing mobile snippet block.
snippet-manifest.yaml	Adds Android framework metadata and includes Android in mobile_login_pkce scenario frameworks.
scripts/extract-snippets.ts	Adds logic to detect Android library versions from Gradle version catalogs (TOML).
samples/ios/login-pkce/QuickstartTests/AuthConfigTests.swift	Updates a localhost-with-port issuer test fixture string.
samples/android/manifest.yaml	New per-framework manifest defining Android framework + mobile_login_pkce scenario metadata.
samples/android/login-pkce/settings.gradle.kts	New Android sample Gradle settings (repos, project name, module include).
samples/android/login-pkce/README.md	New Android sample setup/run documentation and behavioral notes.
samples/android/login-pkce/local.example.properties	Template for local SecureAuth/CIAM configuration values.
samples/android/login-pkce/gradlew.bat	Adds Windows Gradle wrapper script for the Android sample.
samples/android/login-pkce/gradlew	Adds POSIX Gradle wrapper script for the Android sample.
samples/android/login-pkce/gradle/wrapper/gradle-wrapper.properties	Pins Gradle wrapper distribution for the Android sample.
samples/android/login-pkce/gradle/libs.versions.toml	Defines versions and aliases (AGP/Kotlin/Compose/AppAuth/etc.) for the Android sample.
samples/android/login-pkce/gradle/gradle-daemon-jvm.properties	Adds Gradle daemon JVM/toolchain configuration for the Android sample.
samples/android/login-pkce/gradle.properties	Android/Gradle/Kotlin build settings for the sample.
samples/android/login-pkce/build.gradle.kts	Top-level Gradle plugins configuration using version catalog aliases.
samples/android/login-pkce/app/build.gradle.kts	Android app module build config (BuildConfig CIAM fields, Compose, deps, tests).
samples/android/login-pkce/app/proguard-rules.pro	Placeholder R8 rules note for AppAuth (minify disabled).
samples/android/login-pkce/app/src/main/AndroidManifest.xml	Declares app + AppAuth redirect receiver intent filter with placeholder scheme.
samples/android/login-pkce/app/src/main/res/values/strings.xml	Adds app name string resource.
samples/android/login-pkce/app/src/main/java/com/secureauth/quickstart/MainActivity.kt	Compose host activity wiring ActivityResult to the ViewModel.
samples/android/login-pkce/app/src/main/java/com/secureauth/quickstart/ContentScreen.kt	Compose UI for signed-out/error/signed-in states.
samples/android/login-pkce/app/src/main/java/com/secureauth/quickstart/AuthViewModel.kt	AppAuth-based PKCE login, token exchange, logout revocation, expiry scheduling, snippet tags.
samples/android/login-pkce/app/src/main/java/com/secureauth/quickstart/AuthExpiry.kt	Helper to evaluate token expiry and compute remaining time.
samples/android/login-pkce/app/src/main/java/com/secureauth/quickstart/IDToken.kt	JWT payload decoding for welcome message display claims.
samples/android/login-pkce/app/src/test/java/com/secureauth/quickstart/AuthConfigTest.kt	JVM unit tests for issuer URI construction logic.
samples/android/login-pkce/app/src/test/java/com/secureauth/quickstart/AuthExpiryTest.kt	JVM unit tests for expiry evaluation behavior.
samples/android/login-pkce/app/src/test/java/com/secureauth/quickstart/IDTokenTest.kt	JVM unit tests for JWT payload decoding and welcome-name precedence.
README.md	Adds samples/android/ to the repository samples index.
.gitignore	Adds Kotlin build cache dir ignore, broadens keystore ignore, and ignores captures.

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