Fix Intl interop crash on Kotlin/JS web target

js("new Foo(x).bar()") can misparse so `new` binds to the whole chain
instead of just the constructor call, throwing "X.resolvedOptions is not a
constructor" at runtime on the JS target (Kotlin/Wasm was unaffected, since
its js() compiles through a different path). Binding the constructor result
to a local variable first removes the ambiguity.

This was also silently breaking systemCurrencies() and the currency display
name lookup, and had been cascading into an unrelated CoinGecko test
failure in the same karma bundle.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QpjMKWGoiT5aJBzhxvXkwp

shared/src/webMain/kotlin/xyz/tyiu/satsprice/SystemCurrencies.web.kt

@@ -4,8 +4,11 @@ package xyz.tyiu.satsprice
 
 private fun jsSupportedCurrencyCodes(): JsArray<JsString> = js("Intl.supportedValuesOf('currency')")
 
-private fun jsCurrencyDisplayName(code: String): String =
-    js("new Intl.DisplayNames(['en'], { type: 'currency' }).of(code)")
+// A chained `new Foo(x).bar()` inside js() can misparse (`new` binding to the whole chain rather
+// than just the constructor call), so the constructor result is bound to a variable first.
+private fun jsCurrencyDisplayName(code: String): String = js(
+    "(function() { var names = new Intl.DisplayNames(['en'], { type: 'currency' }); return names.of(code); })()",
+)
 
 actual fun systemCurrencies(): List<CurrencyInfo> =
     jsSupportedCurrencyCodes()
@@ -24,8 +27,9 @@ actual fun systemCurrencies(): List<CurrencyInfo> =
  */
 actual fun localeCurrencyCode(): String? = null
 
-private fun jsCurrencyFractionDigits(code: String): Int =
-    js("new Intl.NumberFormat('en', { style: 'currency', currency: code }).resolvedOptions().maximumFractionDigits")
+private fun jsCurrencyFractionDigits(code: String): Int = js(
+    """(function() { var fmt = new Intl.NumberFormat('en', { style: 'currency', currency: code }); return fmt.resolvedOptions().maximumFractionDigits; })()""",
+)
 
 actual fun currencyDecimalDigits(code: String): Int = try {
     jsCurrencyFractionDigits(code)