IS-5161 Expand HaapiStepper UI components list in README

src/login-web-app/src/haapi-stepper/README.md

@@ -114,6 +114,19 @@ Because the `HaapiStepperStepUI` handles all possible HAAPI authentication flows
 
 Check out [the HaapiStepperStepUI documentation and usage examples](./feature/steps/HaapiStepperStepUI.tsx).
 
+### ViewName built-in UIs
+
+Some HAAPI viewNames (`step.metadata.viewName`) need a UI that the generic step rendering can't deliver well. For example, the **BankID** screen needs to render a spinner while the polling status is `pending`, and lifts the QR code above the actions.
+
+To handle this kind of view, the library ships **viewName built-in UIs** that automatically take over when the matching `step.metadata.viewName` arrives from the server.
+
+#### The `enableViewNameBuiltInUIs` prop
+
+`<HaapiStepperStepUI>` accepts a
+`enableViewNameBuiltInUIs?: HaapiStepperViewNameBuiltInUI[] | boolean` prop that opts in to which viewName built-in UIs are active. It is **opt-in**: when the prop is omitted (or `false`), no viewName built-in UIs are applied and every step renders through the generic render pipeline. Pass `true` to enable all known built-ins, or an array of built-in view names (`HaapiStepperViewNameBuiltInUI[]`) to pin a specific subset.
+
+Check out documentation and usage examples in [`HaapiStepperStepUI`](./feature/steps/HaapiStepperStepUI.tsx), and the test use cases in [`HaapiStepperStepUI.spec.tsx`](./feature/steps/HaapiStepperStepUI.spec.tsx) (`describe('ViewName built-in UIs Rendering')`) for more details.
+
 
 
 ## HAAPI Stepper UI Components
@@ -128,12 +141,20 @@ The HAAPI Stepper UI components are the UI representation of the main HAAPI enti
 
 Check out documentation and usage examples in the links below:
 
-* [HaapiStepperFormUI](./feature/actions/form/HaapiStepperFormUI.tsx)
-* [HaapiStepperSelectorUI](./feature/actions/selector/HaapiStepperSelectorUI.tsx)
-* [HaapiStepperClientOperationUI](./feature/actions/client-operation/HaapiStepperClientOperationUI.tsx)
-* [HaapiStepperMessagesUI](./ui/messages/HaapiStepperMessagesUI.tsx)
-* [HaapiStepperLinksUI](./ui/links/HaapiStepperLinksUI.tsx)
-* [HaapiStepperLinkUI](./ui/links/HaapiStepperLinkUI.tsx)
+* [HaapiStepperStepUI](./feature/steps/HaapiStepperStepUI.tsx)
+  * [HaapiStepperActionsUI](./ui/actions/HaapiStepperActionsUI.tsx)
+    * [HaapiStepperFormUI](./feature/actions/form/HaapiStepperFormUI.tsx)
+      * [HaapiStepperFormFieldUI](./feature/actions/form/fields/HaapiStepperFormFieldUI.tsx)
+        * [HaapiStepperTextFormFieldUI](./feature/actions/form/fields/HaapiStepperTextFormFieldUI.tsx)
+        * [HaapiStepperPasswordFormFieldUI](./feature/actions/form/fields/HaapiStepperPasswordFormFieldUI.tsx)
+        * [HaapiStepperCheckboxFormFieldUI](./feature/actions/form/fields/HaapiStepperCheckboxFormFieldUI.tsx)
+        * [HaapiStepperSelectFormFieldUI](./feature/actions/form/fields/HaapiStepperSelectFormFieldUI.tsx)
+    * [HaapiStepperSelectorUI](./feature/actions/selector/HaapiStepperSelectorUI.tsx)
+    * [HaapiStepperClientOperationUI](./feature/actions/client-operation/HaapiStepperClientOperationUI.tsx)
+  * [HaapiStepperMessagesUI](./ui/messages/HaapiStepperMessagesUI.tsx)
+    * [HaapiStepperMessageUI](./ui/messages/HaapiStepperMessageUI.tsx)
+  * [HaapiStepperLinksUI](./ui/links/HaapiStepperLinksUI.tsx)
+    * [HaapiStepperLinkUI](./ui/links/HaapiStepperLinkUI.tsx)
 
 ### CSS Customization