Reliability release for large-vault sync.
- Fixed HTTP 429 rate-limit floods during full library sync on large vaults (2,500+ archives): linked-archive lookups now use one bulk index request instead of one request per archive, and all sync retries honor the server's
Retry-After. - Added a shared client-side request throttle so library sync, linked-archive sync, and mobile queue sync no longer compete for the same server rate-limit budget.
- Mobile sync queue items are no longer permanently stranded when a rate limit hits mid-sync — they stay pending and retry automatically; per-item failure notices are collapsed into a single summary.
- Fixed recurring "File already exists." errors during author profile sync on case-insensitive file systems and when notes are created concurrently.