Crops the key/globe mark out of the existing logo and wires it into
base.html.twig as favicon.ico plus PNG/apple-touch-icon variants.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Give the public homepage a themed breach-alert hero and add a /briefing
page with the full mission narrative, both linking into the existing
game dashboard flow.
Frank