v0.2.1

Fixes

• Fix concurrent login race condition — synchronized auth to prevent parallel API calls from clearing each other's session cookies (root cause of intermittent HTTP 500 errors)
• Parallel data fetching with per-request retry for reliable cold starts (no more missing files on first launch)
• Seamless page reload — no full-screen flash on save or external changes
• Fix list continuation — Enter on empty bullet/numbered item cleanly exits the list instead of looping