Add island bar layout and Settings controls

Group workspaces with Overview and status controls with the clock. Keep themed backgrounds and borders around each island, with click-through gaps and configurable side padding defaulting to 4 px.

Capture blur within each panel region and update material and input regions when island bounds change. Cover layout reloads and padding changes with widget and native shell tests.

compositor/src/config.rs

@@ -80,6 +80,12 @@ pub(crate) struct DaemonConfig {
 #[derive(Debug, Default, Deserialize)]
 #[allow(dead_code)]
 struct ShellStatusConfig {
+    bar_layout: Option<ferese_config::BarLayout>,
+    #[serde(
+        default = "ferese_config::default_bar_island_padding",
+        deserialize_with = "ferese_config::deserialize_bar_island_padding"
+    )]
+    bar_island_padding: f32,
     battery_percentage: Option<bool>,
     low_battery_threshold: Option<u8>,
     settings_command: Option<Vec<String>>,
@@ -359,6 +365,29 @@ pub(crate) fn config_path() -> Option<PathBuf> {
 
 #[cfg(test)]
 mod tests {
+    #[test]
+    fn bar_layout_is_validated_before_live_publication() {
+        for layout in ["continuous", "islands"] {
+            let source = format!("status {{ bar-layout \"{layout}\"; }}");
+            Config::parse_source(&source).unwrap().runtime_config().unwrap();
+        }
+
+        assert!(Config::parse_source("status { bar-layout \"invalid\"; }").is_err());
+    }
+
+    #[test]
+    fn island_padding_is_validated_before_live_publication() {
+        for padding in ["0", "4.5", "12", "32"] {
+            let source = format!("status {{ bar-island-padding {padding}; }}");
+            Config::parse_source(&source).unwrap().runtime_config().unwrap();
+        }
+
+        for padding in ["-1", "32.5", "\"small\""] {
+            let source = format!("status {{ bar-island-padding {padding}; }}");
+            assert!(Config::parse_source(&source).is_err());
+        }
+    }
+
     #[test]
     fn rejects_removed_physics_keys_before_publication() {
         for property in ["spring", "viewport-spring"] {

compositor/src/render/materials.rs

@@ -49,7 +49,13 @@ pub(super) fn append_material_surface(
                     geometry: *rect,
                     corners: *corners,
                     index,
-                    capture_geometry: geometry,
+                    capture_geometry: if crate::effects::surface_role(surface)
+                        .is_some_and(|(role, _)| role == crate::effects::SemanticRole::Panel)
+                    {
+                        *rect
+                    } else {
+                        geometry
+                    },
                     alpha: *alpha,
                 },
             )