chore: release v0.23.6

public/styles/layout.css

@@ -546,22 +546,24 @@
     flex-shrink: 0;
   }
 
-  /* App-Icon als kompaktes Logo */
-  .nav-sidebar__logo::before {
-    content: 'O';
+  /* SVG-Logomark (via DOM API in router.js injiziert) */
+  .nav-sidebar__logomark {
     width: var(--target-sm);
     height: var(--target-sm);
     border-radius: var(--radius-sm);
     background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
     color: var(--color-text-on-accent);
-    font-size: var(--text-sm);
-    font-weight: var(--font-weight-bold);
     display: flex;
     align-items: center;
     justify-content: center;
     flex-shrink: 0;
   }
 
+  .nav-sidebar__logomark svg {
+    width: 16px;
+    height: 16px;
+  }
+
   /* Logo-Text verstecken im collapsed-Modus */
   .nav-sidebar__logo > span {
     display: none;
@@ -662,10 +664,9 @@
     gap: var(--space-3);
   }
 
-  .nav-sidebar__logo::before {
+  .nav-sidebar__logomark {
     width: 28px;
     height: 28px;
-    font-size: var(--text-xs);
   }
 
   .nav-sidebar__logo > span {