Install wasm-pack from cargo for Windows ARM compat

scripts/install-wasm-pack.cjs

@@ -0,0 +1,18 @@
+const { execSync } = require('node:child_process');
+
+const version = tryExecSync('wasm-pack --version');
+if (version.startsWith('wasm-pack ')) {
+  console.log('wasm-pack already installed');
+  return;
+}
+
+console.log('Installing wasm-pack via cargo...');
+execSync('cargo install wasm-pack', { stdio: 'inherit' });
+
+function tryExecSync(cmd) {
+  try {
+    return execSync(cmd, { stdio: 'pipe' }).toString('utf-8');
+  } catch (_) {
+    return '';
+  }
+}