Release v26.1.0

Added

• chromeless input: a single switch that hides the toolbar and sidebar so the
  viewer shows just the scrolling pages — an embedded/inline preview mode. It is
  shorthand for showToolbar=false + showSidebar=false and overrides them
  without mutating those bindings, so toggling it off restores them. Reach for
  pageOverlayTpl when you need per-page DOM in the host app.