Fix #785: commands refuse an id that isn't an object id instead of using the selection

Commands whose `id` or `ids` the shared check in Session::execute does not
read still parsed them with id_param/ids_param, which drop anything that is
not a non-negative integer, and then acted on the selection or the current
layer. `object.blend.make {"ids": 3}` blended the selection,
`object.envelope.makeWithWarp {"ids": [2, "x"]}` warped the selection,
`graph.setData {"id": "2"}` changed the selected graph and
`layer.newSublayer {"parent": "2"}` added a sublayer to the current layer.

- cmd::named_ids and cmd::named_id read `ids`/`id` as targets does: a value
  that is not an object id, or an unresolved step reference, is an error.
- The symbol and brush, Live Paint, Shape Builder and Image Trace, blend,
  envelope and mesh, perspective, Liquify, Puppet Warp and graph helpers use
  them in place of the lenient readers.
- layer.clippingMask.toggle checks `id`, and layer.newSublayer checks
  `parent`, with checked_id before falling back to the highlighted row or the
  current layer.

crates/engine/src/cmd/graph.rs

@@ -17,7 +17,7 @@ use vectorcraft_doc::{
 use vectorcraft_geom::{Affine, BezPath, FillRule, PathData, Point, Rect, shapes};
 
 use super::typecmd::refresh_bounds;
-use super::{CommandSpec, EngineError, Result, Session, bad, bool_or, cmd, f64_or, f64_req, has_doc, has_selection, id_param, ok, str_param};
+use super::{CommandSpec, EngineError, Result, Session, bad, bool_or, cmd, f64_or, f64_req, has_doc, has_selection, named_id, ok, str_param};
 
 mod axis;
 mod columns;