feat(ui): 集成 shadcn/ui 原语、Framer Motion 动画和 Sonner Toast

- 添加 shadcn/ui 风格原语组件 (Button, Input, Dialog, Select, Slider, Switch, Tooltip)
- 集成 Framer Motion 动画库，添加动画预设
- 集成 Sonner Toast 通知系统
- 改造 ChatMessage 添加淡入动画和复制按钮
- 改造 Sidebar 添加动画、空状态引导和骨架屏
- 改造 ConfigPanel 使用新原语组件
- 优化 Chat 页面空状态和连接状态指示器
- 添加 tailwindcss-animate 插件

packages/ui/src/primitives/Slider.tsx

@@ -0,0 +1,20 @@
+import * as SliderPrimitive from '@radix-ui/react-slider';
+import { forwardRef } from 'react';
+import { cn } from '../utils/cn';
+
+export const Slider = forwardRef<
+  React.ElementRef<typeof SliderPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof SliderPrimitive.Root>
+>(({ className, ...props }, ref) => (
+  <SliderPrimitive.Root
+    ref={ref}
+    className={cn('relative flex w-full touch-none select-none items-center', className)}
+    {...props}
+  >
+    <SliderPrimitive.Track className="relative h-2 w-full grow overflow-hidden rounded-full bg-gray-700">
+      <SliderPrimitive.Range className="absolute h-full bg-primary-500" />
+    </SliderPrimitive.Track>
+    <SliderPrimitive.Thumb className="block h-5 w-5 rounded-full border-2 border-primary-500 bg-gray-900 transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2 focus-visible:ring-offset-gray-900 disabled:pointer-events-none disabled:opacity-50" />
+  </SliderPrimitive.Root>
+));
+Slider.displayName = SliderPrimitive.Root.displayName;