feat: add footer icon and update menu footer layout

Author: krovs

src/AppMenu.svelte

@@ -3,6 +3,7 @@
   import Shuffle from "carbon-icons-svelte/lib/Shuffle.svelte";
   import FireFill from "carbon-icons-svelte/lib/FireFill.svelte";
   import Search from "carbon-icons-svelte/lib/Search.svelte";
+  import footerFern from "./assets/fern.png";
   import sidebarLogo from "./assets/octopus.png";
   import { scenarioDifficultyClass, type LabGroup, type MenuGroupId } from "./labCatalog";
 
@@ -286,7 +287,7 @@
 
   <footer class="menu-footer">
     <a class="menu-repo-link" href="https://github.com/krovs/devopslabs" target="_blank" rel="noreferrer">
-      <span>🌵 krovs@2026</span>
+      <img class="menu-footer-icon" src={footerFern} alt="" />krovs@2026
     </a>
   </footer>
 </aside>

src/assets/fern.png

@@ -222,7 +222,7 @@ select {
 .menu-footer {
   display: flex;
   align-items: center;
-  justify-content: space-between;
+  justify-content: center;
   gap: 12px;
   margin-top: auto;
   padding-top: 12px;
@@ -232,13 +232,21 @@ select {
 .menu-repo-link {
   display: flex;
   align-items: center;
+  gap: 6px;
   min-width: 0;
   color: var(--muted);
   font-size: 12px;
   font-weight: 700;
   text-decoration: none;
 }
 
+.menu-footer-icon {
+  width: 28px;
+  height: 28px;
+  object-fit: contain;
+  image-rendering: pixelated;
+}
+
 .menu-repo-link:hover {
   color: var(--accent);
 }