style: Consistent backdrop and create server in server-rail

wider server rail with larger icons ans slightly animated.

toju-app/src/app/shared/components/bottom-sheet/bottom-sheet.component.html

@@ -1,13 +1,9 @@
 <!-- Dimmed backdrop. Tap to dismiss. -->
-<div
-  class="fixed inset-0 z-[140] bg-black/40 backdrop-blur-sm"
-  (click)="onBackdropClick()"
-  (keydown.enter)="onBackdropClick()"
-  (keydown.space)="onBackdropClick()"
-  role="button"
-  tabindex="0"
-  aria-label="Close"
-></div>
+<app-modal-backdrop
+  [zIndex]="140"
+  ariaLabel="Close"
+  (dismissed)="onBackdropClick()"
+/>
 
 <!--
   Bottom sheet panel. Slides up from the bottom of the viewport. Drag the top handle downward