Publish theme snapshots through IPC from explicit live state

shell/ferese-settings/src/main.rs

@@ -81,7 +81,7 @@ enum Message {
     RefreshDisplays,
     DisplaysLoaded(Result<Vec<displays::Display>, String>),
     RefreshRate(String, displays::Mode, bool),
-    ThemeChanged(Box<ferese_config::theme::Snapshot>),
+    ThemeChanged(Box<ferese_ipc::theme::Snapshot>),
     DragWindow,
     Page(Page),
     PagePresented(Page),
@@ -151,7 +151,7 @@ struct App {
     native_palette: visuals::Palette,
     family_ids: std::sync::Arc<Vec<String>>,
     gallery_focus: Option<(String, Option<ferese_config::theme::Appearance>)>,
-    resolved: ferese_config::theme::Snapshot,
+    resolved: ferese_ipc::theme::Snapshot,
     undo_revision: u64,
     auto_details: bool,
     advanced_theme: bool,

shell/ferese-settings/src/visuals.rs

@@ -297,7 +297,7 @@ mod tests {
             let theme = ferese_config::theme::ResolvedTheme {
                 appearance: preset.appearance,
                 tokens,
-                ..Default::default()
+                ..ferese_config::theme::default_theme()
             };
             let palette = Palette::from_resolved(&theme);
             for background in [palette.background, palette.sidebar, palette.card] {
@@ -348,7 +348,7 @@ mod tests {
             let resolved = ferese_config::theme::ResolvedTheme {
                 appearance: item.appearance,
                 tokens: ferese_config::theme::preset(item.id, item.appearance).unwrap(),
-                ..Default::default()
+                ..ferese_config::theme::default_theme()
             };
             assert_eq!(
                 Palette::from_resolved(&resolved).native_theme().cosmic().is_dark,