feat: add chroma key tool and settings, including UI components and controls

editor/index.ts

@@ -1,5 +1,5 @@
 export type { AppState, EditorState, SelectionState, ViewportState } from "./state";
-export type { InteractionMode, ToolId, ToolState } from "./tools";
+export type { BrushSettings, ChromaKeySettings, InteractionMode, ToolId, ToolState } from "./tools";
 export { initialToolState } from "./tools";
 export { createInitialAppState, initialEditorState } from "./initial-state";
 export type { AppStore, StateListener } from "./store";