v2.57.4

Fixed

• Deep links no longer fail when the app lives under a dot-directory. Opening a page directly
  (a bookmark or hard reload on /calendar, for instance) returned HTTP 500 whenever the
  installation path contained a dot segment (such as /opt/.apps/yuvomi): Express' sendFile
  checks every segment of an absolute path against its dotfile policy, so the server-controlled
  checkout path itself tripped the guard. The SPA fallback and third-party module assets now serve
  relative to an explicit root, so only the request-derived part of the path is checked. A new
  path-independent suite (test:sendfile-dotpath) rebuilds the condition in a temp directory and
  pins the send behavior the fix relies on.