feat: implement FileList component (#66)

[nullcoder]

Summary

• Create FileList component for vertical file display similar to GitHub Gist
• Add Badge component for language indicators
• Implement copy and download functionality for individual files
• Add anchor navigation for deep linking to specific files

Implementation Details

Components Created

• FileList: Main component displaying files vertically with syntax highlighting
• FileListSkeleton: Loading state component
• Badge: Reusable badge component for language tags

Features

• ✅ Vertical file layout (no tabs, GitHub Gist style)
• ✅ File header with name, language badge, size, and line count
• ✅ Syntax highlighting using CodeEditor in read-only mode
• ✅ Copy button for each file's content
• ✅ Download button for individual files
• ✅ File size in human-readable format (B, KB, MB, etc.)
• ✅ Line count display
• ✅ Anchor navigation (#file-name-index)
• ✅ Mobile responsive design
• ✅ Empty state handling
• ✅ Keyboard accessible with ARIA labels

Utility Functions Added

• formatFileSize(): Convert bytes to human-readable format
• countLines(): Count lines in text content
• fileSlug(): Generate URL-safe slugs from filenames

Tests

• Comprehensive tests for FileList component
• Tests for all new utility functions
• Mock implementations for browser APIs (clipboard, download)

Demo

Created interactive demo page at /demo/file-list showcasing:

• Multiple file collections (Node.js and Python examples)
• Loading states
• Copy/download tracking
• Anchor navigation examples

Closes #66

Test Plan

• All tests pass
• TypeScript compilation succeeds
• Linting passes (only warnings for any types)
• Build completes successfully
• Demo page functions correctly
• Copy functionality works
• Download functionality works
• Anchor navigation works
• Mobile responsive layout verified

🤖 Generated with Claude Code

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	ghostpaste	274b3df	Visit preview	Jun 07 2025, 04:09 PM