feat(admin): expand/collapse all sidebar groups with scrollable nav

Co-authored-by: Cursor <[email protected]>

src/messages/en.json

@@ -1080,6 +1080,8 @@
 				"import": "Import",
 				"settings": "Settings",
 				"backToSite": "Back to site",
+				"expandAll": "Expand all",
+				"collapseAll": "Collapse all",
 				"housekeeping": "Housekeeping",
 				"hotelManagementPanel": "Hotel management panel",
 				"rankLabel": "Rank {rank}",