Replaces the plain textarea on /caddy/edit with a CodeMirror 6 component
that provides live Caddyfile syntax highlighting (keywords, named matchers,
comments). The editor is dynamically imported (ssr: false) to prevent
hydration errors. The write/validate/save/reload state machine and content
flow remain unchanged.
Bundle impact: ~300 kB additional for the /caddy/edit route (CodeMirror 6
core + @uiw/react-codemirror).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
