fix(Sidebar): rename Sparkle icon to Sparkles for consistency

src/renderer/src/components/app/Sidebar.tsx

@@ -20,7 +20,7 @@ import {
   Moon,
   Palette,
   Settings,
-  Sparkle,
+  Sparkles,
   Sun
 } from 'lucide-react'
 import { FC, useEffect } from 'react'
@@ -131,7 +131,7 @@ const MainMenus: FC = () => {
 
   const iconMap = {
     assistants: <MessageSquareQuote size={18} className="icon" />,
-    agents: <Sparkle size={18} className="icon" />,
+    agents: <Sparkles size={18} className="icon" />,
     paintings: <Palette size={18} className="icon" />,
     translate: <Languages size={18} className="icon" />,
     minapp: <LayoutGrid size={18} className="icon" />,