fix: Make ports always appear on the highest layer

src/elements/ports.typ

@@ -39,12 +39,14 @@
   if shape == "pentagon" {
     let sh = port-shape-vertices(side, kind, size)
     let v = sh.vertices.map(off => (rel: off, to: pos))
-    draw.line(
+    // Draw pentagon on a higher layer so it always renders on top of wires
+    // and neighbouring elements.
+    draw.on-layer(1, draw.line(
       v.at(0), v.at(1), v.at(2), v.at(3), v.at(4),
       close: true,
       stroke: shape-stroke,
       fill: shape-fill,
-    )
+    ))
     outer-pos = (rel: sh.outer, to: pos)
     inner-pos = (rel: sh.inner, to: pos)
   } else if is-clock {