fix(ui): prevent modal overlays from inheriting margin-top from parent space-y containers

frontend/src/index.css

@@ -348,10 +348,21 @@ body {
 
   /* Modal-Hintergrund-Overlay */
   .modal-overlay {
+    margin: 0 !important;
+    top: 0 !important;
+    left: 0 !important;
+    right: 0 !important;
+    bottom: 0 !important;
     background-color: var(--bg-overlay);
     backdrop-filter: blur(4px);
   }
 
+  /* Verhindert, dass Elterncontainer mit space-y-* oder space-x-* feste Overlays nach unten verschieben */
+  .fixed.inset-0,
+  [class*="fixed inset-0"] {
+    margin: 0 !important;
+  }
+
   /* File Tree Item */
   .tree-node-active {
     background-color: var(--bg-panel-elevated);