New reusable CopyButton component with checkmark feedback after copy. Added copy buttons to: - SSH public key display (add repo modal) - Webhook URL field (edit repo modal) - Webhook secret field (edit repo modal) - Code snippets in finding detail (via enhanced CodeSnippet component) - Suggested fix code blocks - MCP server endpoint URLs Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>