Primitives · a raise keeps its state under its owner's id

A raise inside another was namespaced by its place in the layer's
queue, so one that came before it moved its id path and rebuilt its
keyed state and focus: an open date popup would lose its month when a
tip appeared. raise now takes its owner's id and draws under it, and
float and float_height pass the owner's id on from every call site.
A test holds a focused box in a raise while another comes before it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/forms/cascade.rs

@@ -265,6 +265,7 @@ impl RenderOnce for Cascader {
             });
             let close = state.clone();
             float(
+                self.id.clone(),
                 anchor,
                 deepest,
                 surface((self.id.clone(), "columns"), cx)