Fix WebSocket reconnect storm (issue #53) caused by stale closure
reading connection.reconnectAttempts from Zustand state. Use a ref
to track attempts, avoiding the closure capture problem entirely.
Improve Dockerfile: create .data directory with correct ownership for
SQLite, set PORT/HOSTNAME env vars explicitly.
Add deployment guide documenting Ubuntu prerequisites (python3, make,
g++ for better-sqlite3 native compilation) and platform-specific
build constraints.
Nyk