Themes already shipped a back.svg in their manifest but card_plugin
ignored it — face-down cards always rendered with the legacy
back_N.png picker, so swapping themes only swapped the faces. Now
the active theme's back rasterises alongside its faces and feeds
into the face-down sprite path; the legacy back_N.png picker remains
the fallback when a theme doesn't ship its own back (e.g. a
user-imported theme that only redefines faces).
theme/plugin.rs caches the active theme's back Handle<Image> in the
ActiveTheme resource on theme-load and theme-switch. card_plugin's
face-down branch reads ActiveTheme first; missing theme back →
legacy back_N.png path indexed by Settings.selected_card_back.
Settings → Cosmetic's card-back picker section gains a caption
("Active theme provides its own back") that surfaces when the
override is in effect, plus the swatch row dims to communicate the
read-only state. Settings file format unchanged — selected_card_back
still round-trips and only takes effect when the theme leaves the
back undefined.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
funman300
7ed4f2cba9