fix(wasm): update connector for buttplug v4 API and vite 8

- Replace fromJSON/toJSON with JSON.parse/JSON.stringify (v4 uses plain
  objects instead of class-based messages)
- Set build target to esnext (required by vite 8's rolldown bundler,
  and appropriate since WASM+WebBluetooth implies a modern browser)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: qdot

wasm/src/index.ts

@@ -1,4 +1,4 @@
-import { ButtplugMessage, IButtplugClientConnector, fromJSON } from 'buttplug';
+import { ButtplugMessage, IButtplugClientConnector } from 'buttplug';
 import { EventEmitter } from 'eventemitter3';
 
 export class ButtplugWasmClientConnector extends EventEmitter implements IButtplugClientConnector {
@@ -57,7 +57,7 @@ export class ButtplugWasmClientConnector extends EventEmitter implements IButtpl
   public send = (msg: ButtplugMessage): void => {
     ButtplugWasmClientConnector.wasmInstance.buttplug_client_send_json_message(
       this.client,
-      new TextEncoder().encode('[' + msg.toJSON() + ']'),
+      new TextEncoder().encode('[' + JSON.stringify(msg) + ']'),
       (output: Uint8Array) => {
         this.emitMessage(output);
       }
@@ -66,6 +66,6 @@ export class ButtplugWasmClientConnector extends EventEmitter implements IButtpl
 
   private emitMessage = (msg: Uint8Array) => {
     const str = new TextDecoder().decode(msg);
-    this.emit('message', fromJSON(str));
+    this.emit('message', JSON.parse(str));
   };
 }

wasm/vite.config.ts

@@ -7,6 +7,7 @@ import topLevelAwait from "vite-plugin-top-level-await";
 
 export default defineConfig({
   build: {
+    target: 'esnext',
     lib: {
       entry: resolve(__dirname, 'src/index.ts'),
       name: 'buttplug-wasm',