Speak to Khoj from the Desktop client

- Use icons to style speech to text recording state

src/interface/desktop/assets/icons/stop-solid.svg

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   viewBox="0 0 384 512"
+   version="1.1"
+   id="svg1"
+   sodipodi:docname="stop-solid.svg"
+   inkscape:version="1.3 (0e150ed, 2023-07-21)"
+   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">
+  <defs
+     id="defs1" />
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="0.4609375"
+     inkscape:cx="192"
+     inkscape:cy="256"
+     inkscape:window-width="1312"
+     inkscape:window-height="449"
+     inkscape:window-x="0"
+     inkscape:window-y="88"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="svg1" />
+  <!--! Font Awesome Pro 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2023 Fonticons, Inc. -->
+  <path
+     d="M0 128C0 92.7 28.7 64 64 64H320c35.3 0 64 28.7 64 64V384c0 35.3-28.7 64-64 64H64c-35.3 0-64-28.7-64-64V128z"
+     id="path1"
+     style="fill:#aa0000" />
+</svg>