style(icons): unify theme-aware palette

assets/icons/array_rect.svg

@@ -16,7 +16,7 @@
   <sodipodi:namedview
      id="namedview9"
      pagecolor="#505050"
-     bordercolor="#eeeeee"
+     bordercolor="#B4B6B9"
      borderopacity="1"
      inkscape:showpageshadow="0"
      inkscape:pageopacity="0"
@@ -37,7 +37,7 @@
      width="8.8888874"
      height="8.8888874"
      rx="0.88888872"
-     stroke="#4cc9f0"
+     stroke="#6DB7ED"
      stroke-width="2.66667"
      fill="none"
      id="rect1"
@@ -48,7 +48,7 @@
      width="8.8888874"
      height="8.8888874"
      rx="0.88888872"
-     stroke="#4cc9f0"
+     stroke="#6DB7ED"
      stroke-width="2.66667"
      fill="none"
      id="rect2"
@@ -59,7 +59,7 @@
      width="8.8888874"
      height="8.8888874"
      rx="0.88888872"
-     stroke="#4cc9f0"
+     stroke="#6DB7ED"
      stroke-width="2.66667"
      fill="none"
      id="rect3"
@@ -70,7 +70,7 @@
      width="8.8888874"
      height="8.8888874"
      rx="0.88888872"
-     stroke="#4cc9f0"
+     stroke="#6DB7ED"
      stroke-width="2.66667"
      fill="none"
      id="rect4"