style: Consistent backdrop and create server in server-rail

wider server rail with larger icons ans slightly animated.

toju-app/src/app/shared/components/modal-backdrop/modal-backdrop.component.html

@@ -0,0 +1,20 @@
+@if (dismissable()) {
+  <div
+    class="fixed inset-0 bg-black/60"
+    [class.backdrop-blur-sm]="blur()"
+    [style.z-index]="zIndex()"
+    (click)="dismiss()"
+    (keydown.enter)="dismiss()"
+    (keydown.space)="dismiss()"
+    role="button"
+    tabindex="0"
+    [attr.aria-label]="ariaLabel()"
+  ></div>
+} @else {
+  <div
+    class="fixed inset-0 bg-black/60"
+    [class.backdrop-blur-sm]="blur()"
+    [style.z-index]="zIndex()"
+    role="presentation"
+  ></div>
+}