refactor(platform): 用户工作台 - 收敛无框视觉并统一导航图标与列表间距

web/src/components/layout/workspace-top-bar.tsx

@@ -1,4 +1,4 @@
-import { Infinity as InfinityIcon, PanelLeftClose, PanelLeftOpen, Settings2 } from "lucide-react";
+import { Infinity as InfinityIcon, PanelLeftClose, PanelLeftOpen, Settings } from "lucide-react";
 import { Link } from "react-router";
 
 import { SystemAnnouncementCenter } from "@/components/layout/system-announcement-center";
@@ -12,7 +12,7 @@ export function WorkspaceTopBar({ sidebarOpen, onToggleSidebar }: { sidebarOpen:
     const user = useUserStore((state) => state.user);
 
     return (
-        <header className="app-workspace-topbar flex shrink-0 items-center justify-between gap-3 border-b px-4 sm:px-5">
+        <header className="app-workspace-topbar flex shrink-0 items-center justify-between gap-3 px-4 sm:px-5">
             <div className="flex min-w-0 items-center gap-2">
                 <button type="button" className="app-workspace-topbar-icon-button" aria-label={sidebarOpen ? "收起侧栏" : "展开侧栏"} onClick={onToggleSidebar}>
                     {sidebarOpen ? <PanelLeftClose className="size-4" /> : <PanelLeftOpen className="size-4" />}
@@ -28,7 +28,7 @@ export function WorkspaceTopBar({ sidebarOpen, onToggleSidebar }: { sidebarOpen:
                 {user ? <SystemAnnouncementCenter userId={user.id} className="app-workspace-topbar-icon-button" /> : null}
                 <AnimatedThemeToggler className="app-workspace-topbar-icon-button" theme={theme} onThemeChange={setTheme} aria-label="切换主题" />
                 <Link to="/settings" className="app-workspace-topbar-icon-button" aria-label="设置" title="设置">
-                    <Settings2 className="size-4" />
+                    <Settings className="size-4" />
                 </Link>
             </div>
         </header>