feat(auth): support friendlyName and user.name fallback for WebAuthn passkey enrollment

[spydon]

Summary

Implements the WebAuthn MFA enrollment friendlyName and user.name fallback from supabase-js in the Dart passkey API, reopening SDK-701 (previously resolved as not_applicable in #1556).

GoTruePasskeyApi.startRegistration() now accepts an optional friendlyName. Between fetching the registration options and the platform ceremony, it backfills options['user']['name'] (and displayName) when the server omits it, using friendlyName if given or a generic default (Passkey) otherwise. This mirrors supabase-js's pre-navigator.credentials.create() patch, expressed idiomatically without the ${user.id}: concatenation. GoTrueClientPasskey.registerPasskey() in supabase_flutter threads friendlyName through to the full ceremony.

Verify first (server behavior)

Confirmed against supabase/auth: webAuthnUser.WebAuthnName() returns the user's email or phone, and an empty string when the user has neither. The server therefore can omit a meaningful user.name, so the fallback is load-bearing, not merely defensive.

No passkeys library change needed

The passkeys plugin's UserType requires non-null name/displayName. Because the fallback runs in gotrue before the options reach the plugin, the plugin always receives a valid name and needs no change.

Outcome: implemented

Tests

• packages/gotrue/test/passkey_test.dart: enrollment with friendlyName, without friendlyName (default), and the server-omits-user.name case; plus a guard that a server-provided user.name is preserved. All 20 passkey tests pass.

Compliance matrix

auth.mfa.enroll (partially_implemented): dropped the "WebAuthn has no Dart equivalent" caveat; the note now points to auth.passkey.register_passkey, which accepts a friendlyName and applies the same user.name fallback. No new public symbols (optional named parameters only).

Reference

supabase-js PR #1763, commit f99a58c.

Ref: SDK-701

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📥 Commits

Reviewing files that changed from the base of the PR and between 20a82be and a7d4e4b.

📒 Files selected for processing (5)

• packages/gotrue/lib/src/gotrue_passkey_api.dart
• packages/gotrue/test/mocks/passkey_mock_client.dart
• packages/gotrue/test/passkey_test.dart
• packages/supabase_flutter/lib/src/supabase_passkey.dart
• sdk-compliance.yaml

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