refactor: extract CodeSnippet to shared ui component

Move components/favicon/CodeSnippet.tsx → components/ui/code-snippet.tsx.
Update Favicon tool import path. Replace Animate tool's local CodeBlock
(with external copy/download buttons) with the shared CodeSnippet.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/animate/ExportPanel.tsx

@@ -1,10 +1,9 @@
 'use client';
 
 import { useMemo, useState } from 'react';
-import { Copy, Download } from 'lucide-react';
-import { toast } from 'sonner';
 import { cn } from '@/lib/utils/cn';
 import { buildCSS, buildTailwindCSS } from '@/lib/animate/cssBuilder';
+import { CodeSnippet } from '@/components/ui/code-snippet';
 import type { AnimationConfig } from '@/types/animate';
 
 interface Props {
@@ -13,45 +12,6 @@ interface Props {
 
 type ExportTab = 'css' | 'tailwind';
 
-const actionBtn =
-  'flex items-center justify-center gap-1.5 px-3 py-1.5 text-xs glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all';
-
-function CodeBlock({ code, filename }: { code: string; filename: string }) {
-  const copy = () => {
-    navigator.clipboard.writeText(code);
-    toast.success('Copied to clipboard!');
-  };
-
-  const download = () => {
-    const blob = new Blob([code], { type: 'text/css' });
-    const url = URL.createObjectURL(blob);
-    const a = document.createElement('a');
-    a.href = url;
-    a.download = filename;
-    a.click();
-    URL.revokeObjectURL(url);
-    toast.success(`Downloaded ${filename}`);
-  };
-
-  return (
-    <div className="space-y-2">
-      <div className="relative group rounded-xl overflow-hidden border border-white/5" style={{ background: '#06060e' }}>
-        <pre className="p-4 overflow-x-auto font-mono text-[11px] text-white/55 leading-relaxed max-h-64 scrollbar">
-          <code>{code}</code>
-        </pre>
-      </div>
-      <div className="flex gap-2">
-        <button onClick={copy} className={cn(actionBtn, 'flex-1')}>
-          <Copy className="w-3 h-3" />Copy
-        </button>
-        <button onClick={download} className={cn(actionBtn, 'flex-1')}>
-          <Download className="w-3 h-3" />Download .css
-        </button>
-      </div>
-    </div>
-  );
-}
-
 export function ExportPanel({ config }: Props) {
   const [tab, setTab] = useState<ExportTab>('css');
   const css = useMemo(() => buildCSS(config), [config]);
@@ -76,8 +36,8 @@ export function ExportPanel({ config }: Props) {
           ))}
         </div>
       </div>
-      {tab === 'css' && <CodeBlock code={css} filename={`${config.name}.css`} />}
-      {tab === 'tailwind' && <CodeBlock code={tailwind} filename={`${config.name}.tailwind.css`} />}
+      {tab === 'css' && <CodeSnippet code={css} maxHeight="16rem" />}
+      {tab === 'tailwind' && <CodeSnippet code={tailwind} maxHeight="16rem" />}
     </div>
   );
 }