kernel(rml-compositing): surface-element box readback, per-row drag, xdg-decoration

- SurfaceElement::rendered_width()/height(): read back the RCSS-resolved root
  <img> content box (the substrate already computes it for popup placement) so a
  window manager can size a client to its on-screen tile. Reading geometry, not
  computing it -- RCSS still owns layout.
- UiSurface::bind_list_drag(list, name, cb(row, phase, x, y)): the per-row drag
  binding (list analogue of bind_drag + bind_list_event), for per-window move and
  resize in a data-for list.
- Expose wlr_xdg_decoration_v1 through the wlr wrapper (for ext-xdg-shell's
  server-side-decoration negotiation).

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