docs: add SVG design guide and update PDF and XML asset files

assets/icons/xml.svg

@@ -1,97 +1,13 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   viewBox="0 0 48 48"
-   width="48"
-   height="48"
-   version="1.1"
-   id="svg4"
-   sodipodi:docname="xml.svg"
-   inkscape:version="1.4.2 (f4327f4, 2025-05-13)"
-   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="defs4" />
-  <sodipodi:namedview
-     id="namedview4"
-     pagecolor="#ffffff"
-     bordercolor="#000000"
-     borderopacity="0.25"
-     inkscape:showpageshadow="2"
-     inkscape:pageopacity="0.0"
-     inkscape:pagecheckerboard="0"
-     inkscape:deskcolor="#d1d1d1"
-     showgrid="false"
-     inkscape:zoom="16.8125"
-     inkscape:cx="23.97026"
-     inkscape:cy="24"
-     inkscape:window-width="1920"
-     inkscape:window-height="1009"
-     inkscape:window-x="1912"
-     inkscape:window-y="-8"
-     inkscape:window-maximized="1"
-     inkscape:current-layer="svg4" />
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 48" width="48" height="48">
   <!-- Folha de documento com dobra -->
-  <path
-     d="M 8 4 L 32 4 L 42 14 L 42 44 L 8 44 Z"
-     fill="#ffffff"
-     stroke="#0288d1"
-     stroke-width="2.5"
-     stroke-linejoin="round"
-     id="path1" />
+  <path d="M 8 4 L 32 4 L 42 14 L 42 44 L 8 44 Z" fill="#ffffff" stroke="#0288d1" stroke-width="2.5" stroke-linejoin="round"/>
   <!-- Dobra de canto -->
-  <path
-     d="M 32 4 L 32 14 L 42 14 Z"
-     fill="#b3e5fc"
-     stroke="#0288d1"
-     stroke-width="2"
-     stroke-linejoin="round"
-     id="path2" />
+  <path d="M 32 4 L 32 14 L 42 14 Z" fill="#b3e5fc" stroke="#0288d1" stroke-width="2" stroke-linejoin="round"/>
   <!-- Linhas de texto representativas -->
-  <line
-     x1="12.3"
-     y1="17.20446"
-     x2="26.299999"
-     y2="17.20446"
-     stroke="#b0bec5"
-     stroke-width="2"
-     stroke-linecap="round"
-     id="line2" />
-  <line
-     x1="12.3"
-     y1="20.747211"
-     x2="34.299999"
-     y2="20.747211"
-     stroke="#b0bec5"
-     stroke-width="2"
-     stroke-linecap="round"
-     id="line3" />
-  <line
-     x1="12.3"
-     y1="24.289963"
-     x2="34.299999"
-     y2="24.289963"
-     stroke="#b0bec5"
-     stroke-width="2"
-     stroke-linecap="round"
-     id="line4" />
+  <line x1="13" y1="18" x2="27" y2="18" stroke="#b0bec5" stroke-width="2" stroke-linecap="round"/>
+  <line x1="13" y1="22" x2="35" y2="22" stroke="#b0bec5" stroke-width="2" stroke-linecap="round"/>
+  <line x1="13" y1="26" x2="35" y2="26" stroke="#b0bec5" stroke-width="2" stroke-linecap="round"/>
   <!-- Etiqueta azul com sigla XML -->
-  <rect
-     x="11.3"
-     y="30.799257"
-     width="28"
-     height="11"
-     rx="3"
-     fill="#0288d1"
-     id="rect4" />
-  <text
-     x="25.296093"
-     y="39.100037"
-     font-family="'Segoe UI', Arial, sans-serif"
-     font-size="8px"
-     font-weight="bold"
-     fill="#ffffff"
-     text-anchor="middle"
-     id="text4">&lt;XML&gt;</text>
+  <rect x="11" y="31" width="28" height="11" rx="3" fill="#0288d1"/>
+  <text x="25" y="39" font-family="'Segoe UI', Arial, sans-serif" font-size="8px" font-weight="bold" fill="#ffffff" text-anchor="middle">&lt;XML&gt;</text>
 </svg>