Swaps the role of `:root` (now light) and the data-theme attribute
(now `[data-theme="dark"]`) in cassandra.css, flips the localStorage
fallback from 'dark' to 'light' in base/login/verify templates, and
updates the theme-toggle label and the branding-consistency test
selectors to match.
Existing users with cassandra.theme=dark in localStorage still see
dark — their explicit preference wins. Only first-time visitors and
users with no stored preference shift to light.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Giorgio Gilestro
89632e9937