Big first commit

authentication-zero and first layout

app/assets/images/icon.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://w3.org" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
+  <path d="M21 7.5l-9-5.25L3 7.5m18 0l-9 5.25m9-5.25v9l-9 5.25M3 7.5l9 5.25M3 7.5v9l5.25 3.03M12 12.75v9" />
+</svg>

app/assets/stylesheets/application.css

@@ -8,3 +8,29 @@
  *
  * Consider organizing styles into separate files for maintainability.
  */
+
+@media (min-width: 768px) {
+  /* 1. Die Sidebar verkleinert sich flüssig auf 64px */
+  #desktop-sidebar-toggle:checked ~ aside {
+    width: 4rem !important; /* md:w-16 */
+  }
+  
+  /* 2. Fehlerbehebung: Der rechte Inhaltsbereich wird beim Einklappen unsichtbar */
+  #desktop-sidebar-toggle:checked ~ aside .footer-collapse-content {
+    opacity: 0 !important;
+    visibility: hidden !important;
+    transition: opacity 0.15s ease-in-out, visibility 0.15s ease-in-out;
+  }
+  
+  /* 3. Die Standard-Navigations-Texte oben schrumpfen ebenfalls */
+  #desktop-sidebar-toggle:checked ~ aside .collapse-text {
+    max-width: 0 !important;
+    opacity: 0 !important;
+    margin-left: 0 !important;
+  }
+
+  /* 4. Der Hauptinhalt rückt nach links nach */
+  #desktop-sidebar-toggle:checked ~ .main-content {
+    padding-left: 4rem !important;
+  }
+}