Add a Settings button to the home sidebar below History.

Co-authored-by: Cursor <cursoragent@cursor.com>

clone _of_clarus_ai_chat_bot/ViewModels/HomeViewModel.swift

@@ -7,7 +7,8 @@ final class HomeViewModel: ObservableObject {
     @Published var selectedModel = "Claude-Haiku"
 
     let navigationItems: [SidebarItem] = [
-        SidebarItem(title: "History", symbol: "clock")
+        SidebarItem(title: "History", symbol: "clock"),
+        SidebarItem(title: "Settings", symbol: "gearshape")
     ]
 
     let quickActions: [QuickAction] = [