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/favicon/FaviconGenerator.tsx

@@ -4,7 +4,7 @@ import * as React from 'react';
 import { Download, Loader2, Code2, Globe, Layout, FileImage } from 'lucide-react';
 import { FaviconFileUpload } from './FaviconFileUpload';
 import { ColorInput } from '@/components/ui/color-input';
-import { CodeSnippet } from './CodeSnippet';
+import { CodeSnippet } from '@/components/ui/code-snippet';
 import { generateFaviconSet } from '@/lib/favicon/faviconService';
 import { downloadBlobsAsZip } from '@/lib/media/utils/fileUtils';
 import type { FaviconSet, FaviconOptions } from '@/types/favicon';