added notes

src/sequence.typ

@@ -1,6 +1,7 @@
 #import "@preview/cetz:0.2.2": draw
 #import "consts.typ": *
 #import "participant.typ"
+#import "note.typ"
 
 #let get-arrow-marks(sym, color) = {
   if type(sym) == array {
@@ -61,10 +62,15 @@
 
   y -= Y-SPACE
 
+  let h = 0
   // Reserve space for comment
   if elmt.comment != none {
-    y -= measure(box(elmt.comment)).height / 1pt + 6
+    h = calc.max(h, measure(box(elmt.comment)).height / 1pt + 6)
   }
+  if "linked-note" in elmt {
+    h = calc.max(h, note.get-size(elmt.linked-note).height / 2)
+  }
+  y -= h
 
   let i1 = pars-i.at(elmt.p1)
   let i2 = pars-i.at(elmt.p2)
@@ -148,6 +154,12 @@
     )
   )
 
+  let y0 = y
+  if "linked-note" in elmt {
+    let shps = note.render(pars-i, x-pos, elmt.linked-note, y, lifelines).last()
+    shapes += shps
+  }
+
   if elmt.p1 == elmt.p2 {
     if elmt.flip {
       x1 = start-info.lx
@@ -210,6 +222,11 @@
     lifelines.at(i2) = dst-line
   }
 
+  if "linked-note" in elmt {
+    let m = note.get-size(elmt.linked-note)
+    y = calc.min(y, y0 - m.height / 2)
+  }
+
   let r = (y, lifelines, shapes)
   return r
 }