fix(sidebar): Navigationspunkte besser lesbar — Kontrast + Trennlinien

- sidebar-section-label: #475569 → rgba(255,255,255,0.38) (Kontrast ~5:1)
- Aktiver Eintrag: color: #60a5fa + font-weight 500 statt #1677ff
- Hover: rgba(255,255,255,0.88) statt #CBD5E1
- Ruhige Items: rgba(255,255,255,0.6) statt #94A3B8
- Child-Items: rgba(255,255,255,0.42), eingerückt 32px
- sidebar-section--bordered: Trennlinie zwischen Sektionsgruppen
- Sektions-Padding leicht erhöht (18px oben)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

management-ui/src/components/Layout/Sidebar.tsx

@@ -130,9 +130,9 @@ export default function Sidebar({ isOpen, onClose }: SidebarProps) {
         <span className="sidebar-logo-text">{t('app.title')}</span>
       </div>
 
-      {NAV.map((section) => (
+      {NAV.map((section, idx) => (
         <div key={section.labelKey}>
-          <div className="sidebar-section">
+          <div className={`sidebar-section${idx > 0 ? ' sidebar-section--bordered' : ''}`}>
             <div className="sidebar-section-label">{t(section.labelKey)}</div>
           </div>
           <ul className="sidebar-menu">

management-ui/src/styles/enterprise.css

@@ -106,15 +106,21 @@ h1, h2, h3, h4, h5, h6 {
 }
 
 .sidebar-section {
-  padding: 16px 16px 4px;
+  padding: 18px 16px 4px;
+}
+
+/* Trennlinie vor jeder Sektion außer der ersten */
+.sidebar-section--bordered {
+  border-top: 1px solid rgba(255,255,255,0.07);
+  padding-top: 14px;
 }
 
 .sidebar-section-label {
   font-size: 10px;
-  font-weight: 600;
+  font-weight: 700;
   text-transform: uppercase;
-  letter-spacing: 1.5px;
-  color: #475569;
+  letter-spacing: 1.8px;
+  color: rgba(255,255,255,0.38);
   margin-bottom: 4px;
 }
 
@@ -134,9 +140,9 @@ h1, h2, h3, h4, h5, h6 {
   display: flex;
   align-items: center;
   gap: 10px;
-  padding: 8px 10px;
-  font-size: 14px;
-  color: #94A3B8;
+  padding: 7px 10px;
+  font-size: 13px;
+  color: rgba(255,255,255,0.6);
   text-decoration: none;
   border-radius: 6px;
   transition: all 0.15s ease;
@@ -148,8 +154,8 @@ h1, h2, h3, h4, h5, h6 {
 
 .sidebar-menu-item a:hover,
 .sidebar-menu-item button:hover {
-  background: rgba(255,255,255,0.05);
-  color: #CBD5E1;
+  background: rgba(255,255,255,0.06);
+  color: rgba(255,255,255,0.88);
 }
 
 /* Child-Item: sub-nav unter einem Parent (z.B. /firewall/live unter
@@ -157,17 +163,22 @@ h1, h2, h3, h4, h5, h6 {
    Hierarchie sofort sichtbar ist. */
 .sidebar-menu-item--child a,
 .sidebar-menu-item--child button {
-  padding-left: 28px;
-  font-size: 13px;
+  padding-left: 32px;
+  font-size: 12px;
+  color: rgba(255,255,255,0.42);
+}
+.sidebar-menu-item--child:hover a,
+.sidebar-menu-item--child:hover button {
+  color: rgba(255,255,255,0.75);
 }
 .sidebar-menu-item--child::after {
   content: '';
   position: absolute;
-  left: 14px;
-  top: 14px;
-  bottom: 14px;
+  left: 18px;
+  top: 10px;
+  bottom: 10px;
   width: 1px;
-  background: rgba(255,255,255,0.08);
+  background: rgba(255,255,255,0.1);
 }
 
 .sidebar-menu-item.active::before {
@@ -185,17 +196,18 @@ h1, h2, h3, h4, h5, h6 {
 
 .sidebar-menu-item.active a,
 .sidebar-menu-item.active button {
-  background: color-mix(in srgb, var(--branding-accent, #1677ff) 10%, transparent);
-  color: var(--branding-accent, #1677ff);
+  background: color-mix(in srgb, var(--branding-accent, #1677ff) 12%, transparent);
+  color: #60a5fa;
+  font-weight: 500;
 }
 
 .sidebar-version {
   margin-top: auto;
-  padding: 16px;
+  padding: 14px 16px;
   font-size: 11px;
-  color: #475569;
+  color: rgba(255,255,255,0.25);
   text-align: center;
-  border-top: 1px solid rgba(255,255,255,0.06);
+  border-top: 1px solid rgba(255,255,255,0.07);
 }
 
 .sidebar-logo-img {