v0.3.5 — Smooth doors + self-healing

✨ New
• Door system: define door rectangles inside the cabin, auto-open on arrival, auto-close before departure.
Commands: /bet door add, /bet door done, /bet door clear, /bet door test
• Door animation now uses BlockDisplay client-side interpolation — buttery-smooth slide regardless of TPS.

Self-healing
• If the elevator's stored "current floor" drifts from where the cabin physically is (server crash,
manual move, etc.), the plugin now auto-detects the cabin's real floor on next ride and corrects itself —
no more "Source cabin is empty" stuck state.

Fixes
• No more fall damage when riding the elevator downward.
• Arrival sound no longer leaves a tail; start/stop sounds trigger immediately.
• Sliding door open/close animation no longer flashes bright; uses ambient light naturally.