Add resolved appearance engine and paired theme settings

Resolve light, dark and automatic appearance centrally and publish live theme snapshots to native surfaces and the appearance portal. Add paired preset families, custom theme imports, accessibility transforms and contrast-safe transitions.

Refine the Settings gallery and Auto controls, move overrides under advanced customization, and share palette-aware switches and circular slider thumbs. Document configuration and include theme licenses and integration coverage.

shell/ferese-shell/src/main.rs

@@ -166,6 +166,7 @@ struct FereseShell {
     recorder: recording::Recorder,
     calendar_offset: i32,
     status_error: Option<String>,
+    theme_error: Option<String>,
     menu: Option<status_ui::OpenMenu>,
     system_modal: Option<system_modal::SystemModal>,
     guide_shown: bool,
@@ -212,6 +213,9 @@ struct OutputSurfaces {
 
 #[derive(Clone, Debug)]
 enum Message {
+    ThemeChanged(ferese_config::theme::Snapshot),
+    ThemeMode(ferese_config::theme::Mode),
+    ThemeModeSet(Result<(), String>),
     BeginNoteEdit(String),
     NoteAction(String, cosmic::widget::text_editor::Action),
     SaveNote(String, u64),
@@ -282,6 +286,7 @@ impl cosmic::Application for FereseShell {
             recorder: recording::Recorder::default(),
             calendar_offset: 0,
             status_error: None,
+            theme_error: None,
             menu: None,
             system_modal: None,
             guide_shown: false,
@@ -322,6 +327,7 @@ impl cosmic::Application for FereseShell {
 
     fn subscription(&self) -> Subscription<Self::Message> {
         Subscription::batch([
+            ferese_theme::service::subscription().map(Message::ThemeChanged),
             if self
                 .system_modal
                 .as_ref()
@@ -409,6 +415,38 @@ impl cosmic::Application for FereseShell {
         self.update_power_materials();
 
         match message {
+            Message::ThemeChanged(snapshot) => {
+                let mut config = self.config.clone();
+                config.apply_theme(&snapshot.presented);
+                config.theme_mode = snapshot.mode;
+                if snapshot.error != self.theme_error {
+                    if let Some(error) = &snapshot.error {
+                        self.notifications.service_error("Theme could not be loaded", error);
+                    }
+                    self.theme_error = snapshot.error;
+                }
+                return self.apply_config(config);
+            }
+            Message::ThemeMode(mode) => {
+                return cosmic::task::future(async move {
+                    let result = tokio::task::spawn_blocking(move || {
+                        let mut connection = ferese_ipc::theme::Connection::connect().map_err(|e| e.to_string())?;
+                        connection
+                            .call("theme-set-mode", serde_json::json!({"mode": mode}))
+                            .map(|_| ())
+                    })
+                    .await
+                    .unwrap_or_else(|e| Err(e.to_string()));
+                    cosmic::Action::App(Message::ThemeModeSet(result))
+                });
+            }
+            Message::ThemeModeSet(result) => {
+                if let Err(error) = result {
+                    self.notifications
+                        .service_error("Appearance could not be changed", &error);
+                }
+                return Task::none();
+            }
             Message::BeginNoteEdit(id) => {
                 let mut tasks = vec![self.finish_note_edit()];
 
@@ -814,7 +852,7 @@ impl cosmic::Application for FereseShell {
 
 impl FereseShell {
     fn reload_config(&mut self, source: String) -> Task<Message> {
-        let mut config = match config::parse_source(&source) {
+        let config = match config::parse_source(&source) {
             Ok(config) => config,
             Err(error) => {
                 eprintln!("ferese-shell: reload rejected; keeping current config: {error}");
@@ -822,6 +860,10 @@ impl FereseShell {
             }
         };
 
+        self.apply_config(config)
+    }
+
+    fn apply_config(&mut self, mut config: config::ShellConfig) -> Task<Message> {
         if std::env::var_os("FERESE_COMPOSITOR_WALLPAPER").is_some() {
             config.wallpaper.path = None;
         }
@@ -2017,9 +2059,7 @@ impl FereseShell {
         let clock = container(motion::button(
             button::custom(
                 row![
-                    text(date)
-                        .size(12)
-                        .class(theme::Text::Color(color(shell_theme.text_muted))),
+                    text(date).size(12).class(theme::Text::Color(foreground)),
                     text(time).size(bar.text_size).class(theme::Text::Color(foreground)),
                 ]
                 .spacing(8)