v0.26.4

Fixed

• WebEngine controller redirects no longer drop the mount prefix on non-root
  mounts. Isolated-engine _path helpers are mount-relative, and
  redirect_to / redirect_with_inertia (unlike form_with / url_for view
  URL generation) do not prepend the mount's SCRIPT_NAME. So when the engine
  was mounted at a non-root path (e.g. mount StandardId::WebEngine => "/auth"),
  redirects produced prefix-less paths that 404'd — most visibly POST /auth/login redirecting to /login_verify instead of /auth/login_verify,
  breaking passwordless login. Form actions were never affected. All affected
  redirects (login → login_verify; login_verify / reset-password →
  login; session revoke → sessions; account update → account; and the
  after_sign_in denial bounce) now prepend request.script_name via a new
  engine_path helper (a no-op for root mounts). Regression test added to
  spec/integration/multi_mount_spec.rb.