Constant TIMELINE_HTML 

pub const TIMELINE_HTML: &str = "{% extends \"base.html\" %}\n\n{% block title %}Timeline - {{ site_title }}{% endblock %}\n\n{% block content %}\n<h1>Timeline</h1>\n<p class=\"page-description\">Spec activity over time</p>\n\n<div class=\"timeline\">\n{% for group in timeline_groups %}\n<div class=\"timeline-group\">\n    <h2 class=\"timeline-date\">{{ group.date }}</h2>\n    <div class=\"timeline-entries\">\n        <pre class=\"ascii-timeline\">{{ group.ascii_tree }}</pre>\n    </div>\n</div>\n{% endfor %}\n</div>\n\n{% if timeline_groups | length == 0 %}\n<p class=\"empty-state\">No timeline entries to display</p>\n{% endif %}\n{% endblock %}\n";