feat(desktop): globale Keyboard Shortcuts (/, n, ?, g+Buchstabe)

public/styles/layout.css

@@ -1897,6 +1897,49 @@
   }
 }
 
+/* --------------------------------------------------------
+ * Keyboard Shortcut Modal
+ * -------------------------------------------------------- */
+.shortcuts-list {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-1);
+}
+
+.shortcuts-row {
+  display: flex;
+  align-items: center;
+  gap: var(--space-3);
+  padding: var(--space-2) 0;
+  border-bottom: 1px solid var(--color-border-subtle);
+}
+
+.shortcuts-row:last-child {
+  border-bottom: none;
+}
+
+.shortcut-kbd {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 32px;
+  padding: var(--space-0h) var(--space-2);
+  background: var(--color-surface-3);
+  border: 1px solid var(--color-border);
+  border-bottom: 2px solid var(--color-border);
+  border-radius: var(--radius-xs);
+  font-family: var(--font-mono);
+  font-size: var(--text-xs);
+  color: var(--color-text-primary);
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+.shortcut-desc {
+  font-size: var(--text-sm);
+  color: var(--color-text-secondary);
+}
+
 /* --------------------------------------------------------
  * Offline-Banner
  * -------------------------------------------------------- */