refactored separator to use CeTZ style

src/core/utils.typ

@@ -1,4 +1,6 @@
-#import "/src/cetz.typ": draw
+#import "/src/cetz.typ": draw, styles
+
+#import "/src/consts.typ": default-style
 
 #let is-elmt(elmt) = {
   if type(elmt) != dictionary {
@@ -93,19 +95,31 @@
   )
 })
 
+#let extract-ctx(cetz-ctx) = {
+  let state = cetz-ctx.at("shared-state", default: (:))
+  return state.at("chronos", default: (:))
+}
+
 #let set-ctx(func) = draw.set-ctx(c => {
-  let ctx = c.shared-state.chronos
+  let ctx = extract-ctx(c)
   let new-ctx = func(ctx)
   assert(new-ctx != none, message: "set-ctx must return a context!")
-  c.shared-state.chronos = new-ctx
+  let state = c.at("shared-state", default: (:))
+  state.chronos = new-ctx
+  c.shared-state = state
   return c
 })
 
 #let get-ctx(func) = draw.get-ctx(c => {
-  let ctx = c.shared-state.chronos
+  let ctx = extract-ctx(c)
   func(ctx)
 })
 
+#let set-y(new-y) = set-ctx(c => {
+  c.y = new-y
+  return c
+})
+
 #let expand-parent-group(x0, x1) = set-ctx(ctx => {
   if ctx.groups.len() != 0 {
     let group = ctx.groups.last()
@@ -114,4 +128,18 @@
     ctx.groups.last() = group
   }
   return ctx
+})
+
+#let with-ctx-style(func) = draw.get-ctx(cetz-ctx => {
+  let ctx = extract-ctx(cetz-ctx)
+  let glob-style = styles.resolve(
+    cetz-ctx.style,
+    root: "chronos",
+    base: default-style
+  )
+
+  // Normalize because it is used very frequently
+  glob-style.y-space = normalize-units(glob-style.y-space)
+
+  func(ctx, glob-style)
 })