Support SelectableParagraph in fantom tester

Summary:
The fantom test renderer only rendered text children for Paragraph nodes and
its stub component registry did not register the SelectableParagraph
descriptor, so selectable text fell back to an unimplemented view with empty
output. Register the SelectableParagraph descriptor and render its children
from ParagraphState the same way as Paragraph, so selectable text stays
observable in test output.

Changelog: [Internal]

Differential Revision: D126186990

Author: Abbondanzo

private/react-native-fantom/tester/src/render/RenderOutput.cpp

@@ -50,7 +50,10 @@ folly::dynamic RenderOutput::renderView(
   folly::dynamic props = folly::dynamic::object;
 #endif
 
-  if (std::string_view(view.componentName) == "Paragraph") {
+  // SelectableParagraph shares ParagraphState with Paragraph; render its text
+  // the same way so selectable text stays observable in test output.
+  if (std::string_view(view.componentName) == "Paragraph" ||
+      std::string_view(view.componentName) == "SelectableParagraph") {
     const auto& state =
         static_cast<const ConcreteState<ParagraphState>&>(*view.state);
     element["children"] =

private/react-native-fantom/tester/src/stubs/StubComponentRegistryFactory.h

@@ -14,6 +14,7 @@
 #include <react/renderer/components/scrollview/ScrollViewComponentDescriptor.h>
 #include <react/renderer/components/text/ParagraphComponentDescriptor.h>
 #include <react/renderer/components/text/RawTextComponentDescriptor.h>
+#include <react/renderer/components/text/SelectableParagraphComponentDescriptor.h>
 #include <react/renderer/components/text/TextComponentDescriptor.h>
 #include <react/renderer/components/view/ViewComponentDescriptor.h>
 
@@ -29,6 +30,7 @@ inline ComponentRegistryFactory getDefaultComponentRegistryFactory()
       providerRegistry->add(concreteComponentDescriptorProvider<ParagraphComponentDescriptor>());
       providerRegistry->add(concreteComponentDescriptorProvider<ScrollViewComponentDescriptor>());
       providerRegistry->add(concreteComponentDescriptorProvider<RawTextComponentDescriptor>());
+      providerRegistry->add(concreteComponentDescriptorProvider<SelectableParagraphComponentDescriptor>());
       providerRegistry->add(concreteComponentDescriptorProvider<TextComponentDescriptor>());
       providerRegistry->add(concreteComponentDescriptorProvider<ViewComponentDescriptor>());
       providerRegistry->add(concreteComponentDescriptorProvider<ModalHostViewComponentDescriptor>());