Fix auth plugin dynamic form inputs broken after first request

The call_http_authentication_request handler was mutating auth.args with the result of applyDynamicFormInput(), which strips the dynamic callback functions. This permanently corrupted the plugin module's args, making all dynamic form controls (checkboxes, selects, etc.) unresponsive for that auth type after sending the first request.

packages/plugin-runtime/src/PluginInstance.ts

@@ -338,8 +338,8 @@ export class PluginInstance {
       if (payload.type === 'call_http_authentication_request' && this.#mod?.authentication) {
         const auth = this.#mod.authentication;
         if (typeof auth?.onApply === 'function') {
-          auth.args = await applyDynamicFormInput(ctx, auth.args, payload);
-          payload.values = applyFormInputDefaults(auth.args, payload.values);
+          const resolvedArgs = await applyDynamicFormInput(ctx, auth.args, payload);
+          payload.values = applyFormInputDefaults(resolvedArgs, payload.values);
           this.#sendPayload(
             context,
             {