Add overlay gamepad support for keyboard-only mode (#17)

src/main/overlay-runtime.ts

@@ -1,10 +1,9 @@
 import type { BrowserWindow } from 'electron';
+import type { OverlayHostedModal } from '../shared/ipc/contracts';
 import type { WindowGeometry } from '../types';
 
 const MODAL_REVEAL_FALLBACK_DELAY_MS = 250;
 
-type OverlayHostedModal = 'runtime-options' | 'subsync' | 'jimaku' | 'kiku';
-
 export interface OverlayWindowResolver {
   getMainWindow: () => BrowserWindow | null;
   getModalWindow: () => BrowserWindow | null;
@@ -294,5 +293,3 @@ export function createOverlayModalRuntimeService(
     getRestoreVisibleOverlayOnModalClose: () => restoreVisibleOverlayOnModalClose,
   };
 }
-
-export type { OverlayHostedModal };