* fix(auth): prioritize round-robin over lastGood for multi-account rotation
When multiple OAuth accounts are configured, the round-robin rotation was
not working because lastGood was always prioritized, defeating the sort by
lastUsed.
Changes:
- Remove lastGood prioritization in resolveAuthProfileOrder
- Always apply orderProfilesByMode (sorts by lastUsed, oldest first)
- Only respect configuredOrder when explicitly set in config
- preferredProfile still takes priority for explicit user choice
Tested with 2 Google Antigravity accounts - verified alternating usage.
Follow-up to PR #269.
* style: fix formatting
9e49c762e0