add overlay events.

src/component/internal/messages.ts

@@ -39,6 +39,10 @@ export interface NekoEvents {
   ['room.screen.updated']: (width: number, height: number, rate: number) => void
   ['room.clipboard.updated']: (text: string) => void
   ['room.broadcast.status']: (isActive: boolean, url?: string) => void
+
+  // overlay events
+  ['overlay.click']: () => void
+  ['overlay.contextmenu']: () => void
 }
 
 export class NekoMessages extends EventEmitter<NekoEvents> {