feat: laid out "add primitive" buttons

project/assets/icons/noise.svg

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="16.933332mm"
+   height="16.933332mm"
+   viewBox="0 0 16.933332 16.933332"
+   version="1.1"
+   id="svg1"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <g
+     id="layer1">
+    <path
+       style="fill:none;stroke:#5cb863;stroke-width:1;paint-order:fill markers stroke"
+       d="M 0.58053746,3.6723336 C 2.6995197,3.6045873 1.2867677,10.31206 3.2514116,10.379807 5.2160558,10.447553 4.7904403,4.4520006 6.077621,4.4181274 c 1.2871807,-0.033873 1.1988868,7.8340416 2.4860678,7.8340416 1.28718,0 1.8322632,-10.3026739 3.0516972,-10.3026739 1.219434,0 1.324167,10.1093549 2.509728,10.1771019 1.185561,0.06775 0.205938,-6.0895368 2.116574,-6.1795331"
+       id="path1" />
+  </g>
+</svg>