{# src/fledermap/web/templates/_theme_init.html -- included immediately
after , before everything else in every page's
(map.html, sessions_list.html, session_detail.html), including app.css's
. Applies a stored manual dark/light override BEFORE
first paint -- deliberately inline (not a separate .js file, which would
fetch over the network and run too late to avoid a flash of the wrong
theme) and deliberately not deferred. No stored value, or an invalid one
-- no attribute set, so app.css's plain @media (prefers-color-scheme:
dark) block decides, same as if this script didn't run at all. Written
by _nav.html's toggle; see docs/style-guide.md's "Dark mode" section. #}