Implement the reviewed UI icon system and durable review workflow (#853)

Thanks @Nathan-Dane.

crates/engine/src/cmd/sketch_project.rs

@@ -54,10 +54,10 @@ pub static COMMANDS: &[CommandSpec] = &[
         .icon("fit_section")
         .enabled(in_sketch)
         .params(concat!("body: name (a mesh or solid body): its section with the sketch plane, fitted with lines and arcs, as normal (unlinked) geometry", created_doc!())),
-    CommandSpec::new("sketch.break_link", "Break Link", break_link)
+    CommandSpec::new("sketch.break_link", "Break Link", break_link).icon("sketch_break")
         .enabled(in_sketch)
         .params("link?: link id (j1) | entities?: [curve or point ids]: linked geometry becomes normal sketch geometry"),
-    CommandSpec::new("sketch.auto_project", "Auto-Project Edges on Reference", auto_project)
+    CommandSpec::new("sketch.auto_project", "Auto-Project Edges on Reference", auto_project).icon("project")
         .noundo()
         .params("value?: bool (default toggles): project a face's edges when a sketch is created on it"),
 ];