Add gamma control and night light (#38)

Add configurable night light, smooth gamma transitions, and shell controls. Update documentation and panel tests, and fix portal test startup synchronization.

shell/ferese-settings/src/panel_controls.rs

@@ -34,7 +34,7 @@ impl std::fmt::Display for StyleChoice {
     }
 }
 
-const CATALOG: [CatalogItem; 13] = [
+const CATALOG: [CatalogItem; 14] = [
     CatalogItem(ItemKind::Overview),
     CatalogItem(ItemKind::Workspaces {
         style: ferese_panel::WorkspaceStyle::Dots,
@@ -43,6 +43,7 @@ const CATALOG: [CatalogItem; 13] = [
     CatalogItem(ItemKind::Media),
     CatalogItem(ItemKind::Activities),
     CatalogItem(ItemKind::QuickSettings),
+    CatalogItem(ItemKind::NightLight),
     CatalogItem(ItemKind::Network),
     CatalogItem(ItemKind::Audio),
     CatalogItem(ItemKind::Recording),
@@ -862,6 +863,7 @@ pub(super) fn item_icon(kind: ItemKind, tint: cosmic::iced::Color) -> widget::ic
         ItemKind::Media => icons::MEDIA,
         ItemKind::Activities => icons::FERESE,
         ItemKind::QuickSettings => icons::CONTROL_CENTER,
+        ItemKind::NightLight => icons::MOON,
         ItemKind::Network => icons::WIFI_FULL,
         ItemKind::Audio => icons::VOLUME_HIGH,
         ItemKind::Recording => icons::RECORD,

shell/ferese-settings/src/panel_edit.rs

@@ -631,7 +631,9 @@ animations { speed 0.8; }
         apply(&mut snapshot, Action::SetEdge(ferese_panel::Edge::Bottom));
         let before = snapshot.item("panels.0.start").unwrap().clone();
         assert_eq!(snapshot.string("panels.0.edge", ""), "bottom");
-        assert!(snapshot.boolean("panels.0.end.groups.0.items.6.percentage", false));
+        let panels: Vec<Panel> = serde_json::from_value(snapshot.item("panels").unwrap().clone()).unwrap();
+        let battery = panels[0].item(&ItemId("battery".into())).unwrap();
+        assert_eq!(battery.kind, ItemKind::Battery { percentage: true });
         apply(&mut snapshot, Action::SetEdge(ferese_panel::Edge::Top));
         assert_eq!(snapshot.string("panels.0.edge", ""), "top");
         assert_eq!(snapshot.item("panels.0.start"), Some(&before));
@@ -659,8 +661,10 @@ animations { speed 0.8; }
         for edit in edits {
             snapshot.edit(&edit).unwrap();
         }
-        assert!(!snapshot.boolean("panels.0.end.groups.0.items.6.visible", true));
-        assert!(snapshot.boolean("panels.0.end.groups.0.items.6.percentage", false));
+        let panels: Vec<Panel> = serde_json::from_value(snapshot.item("panels").unwrap().clone()).unwrap();
+        let battery = panels[0].item(&ItemId("battery".into())).unwrap();
+        assert_eq!(battery.kind, ItemKind::Battery { percentage: true });
+        assert!(!battery.visible);
         assert!(snapshot.source.contains("// preserved"));
         Snapshot::parse(snapshot.source).unwrap();
     }

shell/ferese-settings/src/panel_preview.rs

@@ -368,6 +368,7 @@ impl App {
             ItemKind::Media => icons::MEDIA,
             ItemKind::Activities => icons::FERESE,
             ItemKind::QuickSettings => icons::CONTROL_CENTER,
+            ItemKind::NightLight => icons::MOON,
             ItemKind::Network => icons::WIFI_FULL,
             ItemKind::Audio => icons::VOLUME_HIGH,
             ItemKind::Recording => icons::RECORD,