feat(ui): 重构核心 UI 组件库，新增 shadcn/ui 组件

- 重构 Button、Card、Badge、Input、Textarea 等基础组件
- 新增 Accordion、Alert、Dialog、Dropdown、Form 等 shadcn/ui 组件
- 新增 AnimatedCounter、StatsShowcase、MetricCard 等数据展示组件
- 新增 ScrollReveal 滚动动画组件
- 重构 Toast 通知系统与 Tooltip 提示组件
- 更新设计令牌系统，对齐新品牌视觉

src/components/ui/badge.tsx

@@ -1,52 +1,57 @@
 'use client';
 
-import * as React from "react"
-import { Slot } from "@radix-ui/react-slot"
-import { cva, type VariantProps } from "class-variance-authority"
-
-import { cn } from "@/lib/utils"
+import * as React from 'react';
+import { Slot } from '@radix-ui/react-slot';
+import { cva, type VariantProps } from 'class-variance-authority';
+import { cn } from '@/lib/utils';
 
 const badgeVariants = cva(
-  "inline-flex items-center justify-center rounded-full border px-3 py-1 text-xs font-medium w-fit whitespace-nowrap shrink-0 [&>svg]:size-3 gap-1 [&>svg]:pointer-events-none focus-visible:border-[var(--color-primary)] focus-visible:ring-2 focus-visible:ring-[var(--color-primary)]/50 transition-all duration-300 overflow-hidden",
+  'inline-flex items-center justify-center rounded-sm border px-3 py-1 text-xs font-medium w-fit whitespace-nowrap shrink-0 [&>svg]:size-3 gap-1.5 [&>svg]:pointer-events-none focus-visible:border-ink focus-visible:ring-2 focus-visible:ring-ink/20 transition-all duration-fast ease-out',
   {
     variants: {
       variant: {
-        default: "bg-[var(--color-brand-primary)] text-white border-transparent shadow-sm",
+        default: 'bg-brand text-white border-transparent',
         secondary:
-          "bg-[var(--color-bg-tertiary)] text-[var(--color-text-secondary)] border-[var(--color-border-primary)]",
-        destructive:
-          "bg-[var(--color-brand-primary)] text-white border-transparent hover:bg-[var(--color-brand-primary-hover)]",
+          'bg-bg-secondary text-text-secondary border-border-primary',
         outline:
-          "border-[var(--color-primary)] text-[var(--color-primary)] bg-transparent hover:bg-[var(--color-primary-lighter)]",
-        ghost: "text-[var(--color-text-placeholder)] hover:text-[var(--color-primary)] hover:bg-[var(--color-primary-lighter)]",
-        success: "bg-[var(--color-success)] text-white border-transparent hover:bg-[var(--color-success-hover)]",
-        warning: "bg-[var(--color-warning)] text-white border-transparent hover:bg-[var(--color-warning-hover)]",
-        info: "bg-[var(--color-info)] text-white border-transparent hover:bg-[var(--color-primary-light)]",
+          'border-border-accent text-text-primary bg-transparent',
+        ghost: 'text-text-muted hover:text-text-primary hover:bg-bg-secondary',
+        success: 'bg-success/10 text-success border-transparent',
+        warning: 'bg-warning/10 text-warning border-transparent',
+        error: 'bg-error/10 text-error border-transparent',
+        info: 'bg-info/10 text-info border-transparent',
+      },
+      size: {
+        sm: 'px-2 py-0.5 text-[10px]',
+        default: 'px-2.5 py-1 text-xs',
+        lg: 'px-3 py-1.5 text-sm',
       },
     },
     defaultVariants: {
-      variant: "default",
+      variant: 'default',
+      size: 'default',
     },
   }
-)
+);
 
 function Badge({
   className,
-  variant = "default",
+  variant = 'default',
+  size,
   asChild = false,
   ...props
-}: React.ComponentProps<"span"> &
+}: React.ComponentProps<'span'> &
   VariantProps<typeof badgeVariants> & { asChild?: boolean }) {
-  const Comp = asChild ? Slot : "span"
+  const Comp = asChild ? Slot : 'span';
 
   return (
     <Comp
       data-slot="badge"
       data-variant={variant}
-      className={cn(badgeVariants({ variant }), className)}
+      className={cn(badgeVariants({ variant, size }), className)}
       {...props}
     />
-  )
+  );
 }
 
-export { Badge, badgeVariants }
+export { Badge, badgeVariants };