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* fix: filter out Google system calendars from calendar list Google system calendars (holidays, birthdays) don't return proper free/busy information, making them useless for availability checking. This change filters them out from the listCalendars() method so users won't see these calendars as selectable options. Filtered calendar types: - Holiday calendars (#holiday@group.v.calendar.google.com) - Birthdays/contacts calendar (#contacts@group.v.calendar.google.com) Co-Authored-By: Volnei Munhoz <volnei.munhoz@gmail.com> * test: add tests for Google system calendar filtering Tests verify that listCalendars() correctly filters out: - Holiday calendars (#holiday@group.v.calendar.google.com) - Birthdays/contacts calendar (#contacts@group.v.calendar.google.com) Test cases cover: - Filtering holiday calendars - Filtering birthdays calendar - Mixed calendars (keeping regular, filtering system) - All system calendars (returns empty array) - Null/undefined calendar IDs - Various international holiday calendar formats Co-Authored-By: Volnei Munhoz <volnei.munhoz@gmail.com> --------- Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>