Restructure Pane to have a single Toolbar with multiple items

crates/theme/src/theme.rs

@@ -94,14 +94,18 @@ pub struct Tab {
 
 #[derive(Clone, Deserialize, Default)]
 pub struct Toolbar {
+    #[serde(flatten)]
+    pub container: ContainerStyle,
     pub height: f32,
+    pub item_spacing: f32,
 }
 
 #[derive(Clone, Deserialize, Default)]
 pub struct Search {
     #[serde(flatten)]
     pub container: ContainerStyle,
-    pub editor: FindEditor,
+    pub max_editor_width: f32,
+    pub editor: FieldEditor,
     pub invalid_editor: ContainerStyle,
     pub option_button_group: ContainerStyle,
     pub option_button: ContainedText,
@@ -115,13 +119,6 @@ pub struct Search {
     pub tab_icon_spacing: f32,
 }
 
-#[derive(Clone, Deserialize, Default)]
-pub struct FindEditor {
-    #[serde(flatten)]
-    pub input: FieldEditor,
-    pub max_width: f32,
-}
-
 #[derive(Deserialize, Default)]
 pub struct Sidebar {
     #[serde(flatten)]