React Router Now Supports Contextual Routing with <Link unstable_mask>

React Router v7.13.1 introduces URL masking via the new <Link unstable_mask> API, enabling first-class contextual routing in Framework and Data Mode. Contextual routing allows the same URL to render differently depending on navigation context—for example, showing a modal when navigating in-app but a full page when accessed directly. The API is simple to use, requiring only an unstable_mask prop on the Link component to specify the masked URL displayed in the address bar.