Data collection / privacy practices question

Calendarium does not collect, transmit, or sell any personal or usage data.
All calendar/astronomical calculations run locally in the browser. The only
network request it ever makes is an optional, user-enabled fetch to the
public Wikimedia API (https://api.wikimedia.org/*) to show "on this day"
content — this sends only the date and language, nothing about the user.
Settings are stored locally via browser.storage.local and never leave the
device. No analytics, no telemetry, no third-party trackers.