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* fix: handle invalid timezones gracefully in getLuckyUser Co-Authored-By: benny@cal.com <sldisek783@gmail.com> * refactor: move timezone validation to getCalendarsEvents with offset conversion - Move invalid timezone handling from getLuckyUser.ts to getCalendarsEvents.ts - Add convertOffsetToEtcGmt() to convert offset formats (GMT-05:00, UTC+08:00) to valid IANA Etc/GMT timezones - Preserves timezone precision for fairness calculations instead of falling back to UTC - Add unit tests for timezone conversion scenarios * refactor: extract timezone conversion to dedicated file - Create timezone-conversion.ts with concise convertOffsetToIanaTimezone and normalizeTimezone functions - Update getCalendarsEvents.ts to import from the new file - Follow kebab-case naming convention for utility files * test: add unit tests for timezone conversion proving Intl.DateTimeFormat behavior - Add tests proving Intl.DateTimeFormat throws RangeError for offset formats (GMT-05:00, UTC+08:00) - Add tests for convertOffsetToIanaTimezone function - Add tests for normalizeTimezone function --------- Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>