Prepping save file support

src/components/Emulator.tsx

@@ -18,15 +18,16 @@ type SendEmulatorMessageVolume = {
 
 type SendEmulatorMessage = (
   SendEmulatorMessageInit |
-  SendEmulatorMessageVolume
+  SendEmulatorMessageVolume |
+  { message: 'save' }
 );
 
 type ReceiveEmulatorMessage = (
   { message: 'iframe_loaded' } |
   { message: 'start' } |
   { message: 'ready' } |
-  { message: 'save' } |
-  { message: 'load' }
+  { message: 'save_state' } |
+  { message: 'load_state' }
 );
 
 export type EmulatorProps = {
@@ -69,8 +70,8 @@ export const Emulator:React.FC<EmulatorProps> = props => {
 
         case 'start':
         case 'ready':
-        case 'load':
-        case 'save':
+        case 'load_state':
+        case 'save_state':
           break;
         default:
           console.error('Invalid message received:', msg);