fix(capacitor-ios): bypass reject() entirely, call errorHandler directly

reject() is a Swift extension method that the SPM precompiled
xcframework doesn't export at all. Call the ObjC errorHandler property
with CAPPluginCallError directly instead.

Author: j3k0

capacitor/ios/Sources/PurchasePlugin/PurchasePlugin.swift

@@ -377,12 +377,9 @@ public class PurchasePlugin: CAPPlugin, CAPBridgedPlugin {
     }
 
     /// Wrapper for call.reject that works with both CocoaPods (source) and SPM (precompiled xcframework).
-    /// The xcframework doesn't export default parameter values, so all 4 args must be explicit.
+    /// The xcframework doesn't export Swift extension methods like reject(), so we call errorHandler directly.
     private func rejectCall(_ call: CAPPluginCall, _ message: String) {
-        let noCode: String? = nil
-        let noError: Error? = nil
-        let noData: [String: Any]? = nil
-        call.reject(message, noCode, noError, noData)
+        call.errorHandler(CAPPluginCallError(message: message, code: nil, error: nil, data: [:]))
     }
 
     private func debugLog(_ msg: String) {