pub fn style_manager_to_signal(
theme: Res<'_, StyleManager>,
store: Option<ResMut<'_, PropertyStore>>,
)Expand description
Producer half of the W1.6 theme-notify path: on every
Changed<StyleManager> tick, writes "dark" / "light" into
PropertyStore under the __theme__ global key based on
crate::components::StyleManager::effective_dark.
Post wave-D the write lands directly on PropertyStore (no Signals
round-trip); apply_theme_signal_to_root_classes consumes it via
dirty_peek on the next schedule step.