v0.2.1

TL;DR

• Version display is now dynamic - reads from the binary, not hardcoded
• API counters refresh on reload - no-cache headers on all endpoints
• Sessions show CWD and group into Active / Recent with timestamps

---

Added

• Session CWD display - working directory basename shown per session
• Active/Recent session grouping - last 15min sessions highlighted green

Fixed

• UI version was hardcoded as v0.1.2 - now injected at runtime
• Counters not updating on page refresh - added cache-busting headers