Show HN: Bridge Days Calculator SPA (bridgedays.github.io)

Show upcoming opportunities for bridge days - periods where a small investment of days taken off can result in a large bounty of consecutive holidays. Vibecoded in about two and a half hours with Claude 4 Sonnet- or rather, coded by Sonnet after my increasingly annoying requests. I have literally not even looked at the code. After brückentage.info died, we didn't really have a good tool for this that also handled short workweeks. Primary credit goes to the OpenHolidays API, who did all the annoying parts of this task for free.