wip: navigating system

ui/resources/icons/back.svg

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="24"
+   height="24"
+   viewBox="0 0 24 24"
+   version="1.1"
+   id="svg1"
+   inkscape:version="1.3 (0e150ed6c4, 2023-07-21)"
+   sodipodi:docname="back.svg"
+   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="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="true"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="px"
+     showgrid="true"
+     inkscape:zoom="24.40625"
+     inkscape:cx="15.323944"
+     inkscape:cy="10.632522"
+     inkscape:current-layer="layer1">
+    <inkscape:grid
+       id="grid4"
+       units="px"
+       originx="12"
+       originy="12"
+       spacingx="1"
+       spacingy="1"
+       empcolor="#0099e5"
+       empopacity="0.30196078"
+       color="#0099e5"
+       opacity="0.14901961"
+       empspacing="5"
+       dotted="false"
+       gridanglex="30"
+       gridanglez="30"
+       visible="true" />
+  </sodipodi:namedview>
+  <defs
+     id="defs1" />
+  <g
+     inkscape:label="图层 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <path
+       style="fill:none;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:2;stroke-dasharray:none;stroke-opacity:1"
+       d="M 17,2 7,12 17,22"
+       id="path2" />
+  </g>
+</svg>

ui/resources/resources.qrc

@@ -8,6 +8,8 @@
 
     <file>fonts/GeosansLight.ttf</file>
 
+    <file>icons/back.svg</file>
+
     <file>images/icon.png</file>
     <file>images/logo.png</file>
     <file>images/jacket-placeholder.png</file>