New: Sidebar and Mandantenwechsel

package.json

@@ -14,11 +14,18 @@
   },
   "dependencies": {
     "@faker-js/faker": "^9.6.0",
+    "@radix-ui/react-avatar": "^1.1.10",
+    "@radix-ui/react-collapsible": "^1.1.12",
+    "@radix-ui/react-dialog": "^1.1.15",
+    "@radix-ui/react-dropdown-menu": "^2.1.16",
     "@radix-ui/react-label": "^2.1.7",
+    "@radix-ui/react-popover": "^1.1.15",
     "@radix-ui/react-select": "^2.2.6",
+    "@radix-ui/react-separator": "^1.1.7",
     "@radix-ui/react-slider": "^1.3.6",
     "@radix-ui/react-slot": "^1.2.3",
     "@radix-ui/react-switch": "^1.2.6",
+    "@radix-ui/react-tooltip": "^1.2.8",
     "@t3-oss/env-core": "^0.12.0",
     "@tailwindcss/vite": "^4.0.6",
     "@tanstack/match-sorter-utils": "^8.19.4",