fix(desktop): simplify expo module build to plain tsc

Replace the cross-platform wrapper script with a direct tsc call.
expo-module build is just tsc + conditional --watch; tsc alone is
one-shot and cross-platform without needing env var hacks.

packages/expo-two-way-audio/package.json

@@ -5,7 +5,7 @@
   "main": "build/index.js",
   "types": "build/index.d.ts",
   "scripts": {
-    "build": "node ./scripts/expo-module-build.cjs",
+    "build": "tsc",
     "clean": "expo-module clean",
     "dev": "expo-module build",
     "lint": "expo-module lint",