Implemented shutdown through UI and implemented router check

frontend/views/dashboard/scss/index.scss

@@ -17,7 +17,7 @@ body {
         }
 
         .mux_menubar-locater.mux_left {
-            .mux_menubar-item:not([uid="restart_installation"]) {
+            .mux_menubar-item:not([uid="restart_installation"], [uid="shutdown_installation"]) {
                 display: none;
             }
         }
@@ -77,4 +77,22 @@ body {
             }
         }
     }
+}
+
+.ntsh_shutdown {
+    position: absolute;
+    inset: 0px;
+    z-index: 10000;
+    background: var(--mux-bg-color);
+    display: none;
+    flex-direction: column;
+    justify-content: center;
+    align-items: center;
+    gap: var(--mux-edge-offset);
+
+    .material-symbols-outlined {
+        margin-bottom: var(--mux-edge-offset);
+        font-size: 60px;
+        color: #919191;
+    }
 }