Calendar: couch surfing availability and claims at /calendar

Source: chat 2026-11-04

Calendar at /calendar for couch surfing stays: month grid, unmarked days available up to 60 days ahead, approved members claim a day with a comment under their username, host approves the claim. Approved members only; reached via a multi-use invite link. Railspike plan: docs/plans/calendar_step1_solution_assessment.md