Users were getting stuck entering handles in wrong formats: - "redfraggle3" (no domain) → auto-append .bsky.social - "@user.bsky.social" (leading @) → strip @ - "user@bsky.social" (email format) → convert @ to . Also replaced technical OAuthResolverError messages with user-friendly text when handle resolution fails. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>