(feat): better connection management, utility functions & tests

src/schema.ts

@@ -18,9 +18,20 @@ export function createSchema(appData: ZodObject) {
       request: z.object({
         challenge: z.base64(),
       }),
+      response: z.object({}),
+    },
+
+    load_app_data: {
+      request: z.object({}),
       response: z.object({
-        app_data: appData,
+        app_data: z.string(),
       }),
     },
+    save_app_data: {
+      request: z.object({
+        app_data: z.string(),
+      }),
+      response: z.object({}),
+    },
   };
 }