Add base authenticated route

matrixgw_frontend/src/widgets/dashboard/DashboardSidebarDividerItem.tsx

@@ -0,0 +1,28 @@
+import * as React from "react";
+import Divider from "@mui/material/Divider";
+import type {} from "@mui/material/themeCssVarsAugmentation";
+import DashboardSidebarContext from "./DashboardSidebarContext";
+import { getDrawerSxTransitionMixin } from "./mixins";
+
+export default function DashboardSidebarDividerItem() {
+  const sidebarContext = React.useContext(DashboardSidebarContext);
+  if (!sidebarContext) {
+    throw new Error("Sidebar context was used without a provider.");
+  }
+  const { fullyExpanded = true, hasDrawerTransitions } = sidebarContext;
+
+  return (
+    <li>
+      <Divider
+        sx={{
+          borderBottomWidth: 1,
+          my: 1,
+          mx: -0.5,
+          ...(hasDrawerTransitions
+            ? getDrawerSxTransitionMixin(fullyExpanded, "margin")
+            : {}),
+        }}
+      />
+    </li>
+  );
+}