侧边栏底部移除设置图标

Co-Authored-By: Claude <noreply@anthropic.com>

serve/frontend/src/components/Layout.tsx

@@ -209,30 +209,16 @@ export function Layout() {
             </div>
           )}
 
-          {/* 暗夜模式 + 设置 */}
-          <div className="flex items-center gap-1 px-1">
+          {/* 暗夜模式 */}
+          <div className="px-1">
             <button
               onClick={toggleDark}
-              className="flex items-center gap-2 flex-1 rounded-btn px-2 py-1.5 text-xs text-foreground/70 hover:bg-elevated hover:text-foreground transition-colors"
+              className="flex items-center gap-2 w-full rounded-btn px-2 py-1.5 text-xs text-foreground/70 hover:bg-elevated hover:text-foreground transition-colors"
               title={darkMode ? '切换为日间模式' : '切换为暗夜模式'}
             >
               {darkMode ? <Moon className="h-3.5 w-3.5" /> : <Sun className="h-3.5 w-3.5" />}
               <span>{darkMode ? '暗夜' : '日间'}</span>
             </button>
-            <NavLink
-              to="/settings"
-              className={({ isActive }) =>
-                cn(
-                  'flex items-center justify-center rounded-btn p-1.5 text-xs transition-colors',
-                  isActive
-                    ? 'bg-accent/10 text-accent'
-                    : 'text-foreground/70 hover:bg-elevated hover:text-foreground',
-                )
-              }
-              title="设置"
-            >
-              <Settings className="h-3.5 w-3.5" />
-            </NavLink>
           </div>
         </div>
       </aside>