feat: added layer tree icons

project/assets/icons/plus.svg

@@ -7,28 +7,61 @@
    viewBox="0 0 16.933332 16.933332"
    version="1.1"
    id="svg1"
+   inkscape:version="1.4.2 (ebf0e940d0, 2025-05-08)"
+   sodipodi:docname="plus.svg"
+   inkscape:export-filename="../../project/assets/icons/plus.svg"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns="http://www.w3.org/2000/svg"
    xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#999999"
+     borderopacity="1"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="mm"
+     inkscape:zoom="11.046421"
+     inkscape:cx="33.766593"
+     inkscape:cy="34.852918"
+     inkscape:current-layer="layer1"
+     showgrid="false">
+    <inkscape:page
+       x="0"
+       y="0"
+       width="16.933332"
+       height="16.933332"
+       id="page2"
+       margin="0"
+       bleed="0" />
+  </sodipodi:namedview>
   <defs
      id="defs1" />
   <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
      id="layer1">
     <rect
        style="fill:#969696;fill-opacity:1;stroke:none;stroke-width:5;stroke-linecap:round;paint-order:fill markers stroke"
        id="rect1"
-       width="3.4427652"
-       height="12.431063"
-       x="6.7452841"
-       y="2.2511349"
-       ry="0.49476871" />
+       width="1.8242012"
+       height="6.5867867"
+       x="7.5545654"
+       y="5.1732726"
+       ry="0.26216069" />
     <rect
        style="fill:#969696;fill-opacity:1;stroke:none;stroke-width:5;stroke-linecap:round;paint-order:fill markers stroke"
        id="rect2"
-       width="3.4427652"
-       height="12.431063"
-       x="6.7452841"
-       y="-14.682198"
-       ry="0.49476871"
+       width="1.8242012"
+       height="6.5867867"
+       x="7.5545659"
+       y="-11.760058"
+       ry="0.26216069"
        transform="rotate(90)" />
   </g>
 </svg>