core/css held 13 flat stylesheets. Grouped by role, matching the JS sub-system
split:
core/css/base/ foundation (3): tokens, style, themes
core/css/components/ chrome + widgets (7): topbar, sidebar, modal, forms,
config, update-notifier, aurora-background
core/css/screens/ full-page screens (3): login, loading-screen,
setup-wizard
Path-only move (git mv) + href rewrite in index.html. No @import anywhere and
the <link> line order is unchanged, so the cascade is preserved; all 13 paths
verified to resolve.
Signed-off-by: librelad <librelad@digitalangels.vip>