feat: implement scale-of-fifth based key signature picker

src/components/common/index.ts

@@ -5,5 +5,6 @@ export { default as LoadingOverlay } from './LoadingOverlay';
 export { default as OpenProjectModal } from './OpenProjectModal';
 export { default as DialogProvider } from './DialogProvider';
 export { default as TrackCreateDialog } from './TrackCreateDialog';
+export { default as FloatingPopup } from './FloatingPopup';
 export { showAlert, showConfirm, showPrompt, showTimeSigPrompt } from '../../util/dialogUtil';
 export type { ConfirmOptions, PromptOptions, TimeSigResult } from '../../util/dialogUtil';