We test our APIs, our components, and sometimes our CSS. Then a release goes out, marketing drops the new page into a Slack channel and a LinkedIn post, and the card shows last month's image with a title that ends in "| Home". Link previews break silently. No error page, no failed request in your logs, nothing in Sentry. The first signal is usually a screenshot from someone outside the team. So I started treating the share card like any other contract and testing it after deploy. This post...