chore: upgrade demo app + Swift default template

[zibs]

Fixes #1075 et al.
Fixes #1067
Fixed #1060

Description

This PR updates the example app to the latest RN version and updates the getting started instructions to align with the new Swift AppDelegate.

Steps to verify

I ran both platforms and logged in via both methods.

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Name	Status	Preview	Comments	Updated (UTC)
react-native-app-auth	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 27, 2025 4:31pm

[Copilot]

Pull Request Overview

This PR upgrades the demo app to the latest React Native version, migrates Android build configs to Kotlin and updated SDK tools, replaces Java app classes with Kotlin templates, and aligns the iOS getting-started docs with the new Swift AppDelegate template.

• Bumped Android SDK, NDK, build tools, added Kotlin plugin, and updated Gradle build scripts
• Removed legacy Flipper Java code, added Kotlin MainApplication and MainActivity
• Updated tests, Gemfile, .gitignore, and iOS docs for Swift AppDelegate integration

Reviewed Changes

Copilot reviewed 57 out of 57 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
examples/demo/android/build.gradle	Updated SDK versions, buildToolsVersion, NDK, Kotlin
examples/demo/android/app/build.gradle	Added Kotlin Android plugin, autolink config, JSC flavor
examples/demo/android/app/src/main/java/com/example/MainApplication.kt	Added Kotlin MainApplication replacing Java version
examples/demo/android/app/src/main/java/com/example/MainActivity.kt	Added Kotlin MainActivity replacing Java version
examples/demo/android/app/src/debug/AndroidManifest.xml	Cleaned up debug manifest, removed DevSettingsActivity
examples/demo/tests/App.test.tsx	Migrated to react-test-renderer and act for tests
examples/demo/App.tsx	New TSX demo app with auth flows
examples/demo/Gemfile	Pinned CocoaPods and Ruby gems to avoid known issues
examples/demo/CHANGELOG.md	Deleted CHANGELOG (history removed)
docs/docs/introduction.md	Updated iOS instructions to Swift bridging header

Comments suppressed due to low confidence (6)

examples/demo/android/app/build.gradle:119

• Re-add the applyNativeModulesAppBuildGradle call to ensure all native modules are properly linked after autolinking.

apply from: file("../../node_modules/@react-native-community/cli-platform-android/native_modules.gradle"); applyNativeModulesAppBuildGradle(project)

examples/demo/android/app/src/debug/AndroidManifest.xml:6

• Removing DevSettingsActivity may disable the in-app developer menu; confirm if this removal is intended.

<activity android:name="com.facebook.react.devsupport.DevSettingsActivity" android:exported="false" />

examples/demo/CHANGELOG.md:1

• The entire CHANGELOG.md was deleted; consider preserving or updating the changelog to retain release history.

# rnaa-demo

examples/demo/android/build.gradle:16

• Specify an explicit version for com.android.tools.build:gradle to ensure build reproducibility and avoid unexpected upgrades.

classpath("com.android.tools.build:gradle")

examples/demo/tests/App.test.tsx:10

• [nitpick] The current test only covers initial render; consider adding tests for refresh and revoke flows to improve coverage of auth functionality.

await ReactTestRenderer.act(() => {

examples/demo/App.tsx:200

• Remove this debug console.log that prints sensitive auth tokens to avoid leaking credentials in production.

console.log('>>>>>>>', JSON.stringify(authState, null, 2));