[ws]

Summary

• Pass the token prompt directly to readline.question() rather than writing it separately and asking an empty question.
• Add a regression test covering the prompt text, stderr output, trimmed token, readline cleanup, and successful login with mocked credentials/API calls.

Problem

On macOS with Bun 1.4.2, ynab auth login appears to hang: readline clears the separately written prompt when rendering its empty question. It is actually waiting for a token with no visible instructions. Passing the prompt to readline keeps it visible during redraws.

Validation

• Regression test fails before the fix and passes afterward.
• bun run test --run: all 46 tests pass.
• bun run typecheck, bun run lint, and bun run build: pass.
• Verified the built CLI in a pseudo-terminal under Bun: the prompt remains visible after the clear-line escape sequence. No token was submitted in this check.
• Formatting could not run because the existing Biome config uses schema 1.9.4 and files.include/files.ignore, which installed Biome 2.3.11 rejects. Left this unrelated configuration unchanged.

Token input/masking behavior, piped stdin, and --token handling are unchanged.