[spydon]

Summary

pub.dev scores supabase_auth_ui 10/20 on platform support. Pana gives a partial score when a package supports Web but is not WASM-ready. The only thing blocking WASM was this import chain:

supa_socials_auth.dart → sign_in_with_apple → sign_in_with_apple_platform_interface → method_channel_sign_in_with_apple.dart → dart:io

The latest sign_in_with_apple (8.2.0) still imports dart:io, so upgrading doesn't fix it.

Changes

• Move every use of sign_in_with_apple into lib/src/utils/native_apple_sign_in.dart. It exposes getNativeAppleCredential and isNativeAppleSignInCanceled.
• Add native_apple_sign_in_stub.dart with the same API, and import it conditionally (if (dart.library.io)) from supa_socials_auth.dart.
• On web, behavior is unchanged: native Apple sign in only ever ran on iOS and macOS, and web always used signInWithOAuth.

Verification

Local pana run on this branch:

• Platform support: 20/20, tagged is:wasm-ready
• All other sections at full points
• flutter analyze and flutter test pass