style: Consistent backdrop and create server in server-rail

wider server rail with larger icons ans slightly animated.

toju-app/src/app/domains/plugins/feature/plugin-store/plugin-store.component.html

@@ -432,10 +432,10 @@
   </div>
 
   @if (serverInstallDialog(); as dialog) {
-    <div
-      class="fixed inset-0 z-[80] bg-black/60"
-      role="presentation"
-    ></div>
+    <app-modal-backdrop
+      [zIndex]="80"
+      [dismissable]="false"
+    />
     <section
       class="fixed left-1/2 top-1/2 z-[81] flex max-h-[min(42rem,calc(100vh-2rem))] w-[min(34rem,calc(100vw-2rem))] -translate-x-1/2 -translate-y-1/2 flex-col overflow-hidden rounded-lg border border-border bg-card text-foreground shadow-2xl"
       role="dialog"

toju-app/src/app/domains/plugins/feature/plugin-store/plugin-store.component.ts

@@ -38,6 +38,7 @@ import type {
 } from '../../../../shared-kernel';
 import { selectCurrentRoom, selectSavedRooms } from '../../../../store/rooms/rooms.selectors';
 import { selectCurrentUser } from '../../../../store/users/users.selectors';
+import { ModalBackdropComponent } from '../../../../shared';
 import { PluginCapabilityService } from '../../application/services/plugin-capability.service';
 import { PluginStoreService } from '../../application/services/plugin-store.service';
 import type {
@@ -60,7 +61,8 @@ interface ServerPluginInstallDialog {
     CommonModule,
     FormsModule,
     ChatMessageMarkdownComponent,
-    NgIcon
+    NgIcon,
+    ModalBackdropComponent
   ],
   viewProviders: [
     provideIcons({