- Fix fontVariant stylistic sets being ignored in New Architecture (#55183)

Summary:
During an upgrade of ReactNative and switching to new arch, we noticed that Android is ignoring *some* fontVariants. Specifically `stylistic-{num}`. Digging further I noticed that there are `stylistic-{num}` mappings added to `fromRawValue` (in `packages/react-native/ReactCommon/react/renderer/attributedstring/conversions.h`), but are not included for `toMapBuffer`

## Changelog:

<!-- Help reviewers and the release process by writing your own changelog entry.

Pick one each for the category and type tags:

[ANDROID|GENERAL|IOS|INTERNAL] [BREAKING|ADDED|CHANGED|DEPRECATED|REMOVED|FIXED|SECURITY] - Message

For more details, see:
https://reactnative.dev/contributing/changelogs-in-pull-requests
-->

[Android] [Fixed] - fontVariants `stylistic-{num}` not being propagated correctly

Pull Request resolved: #55183

Test Plan:
- Added a new free font (FiraCode) that has stylistic features.
- Added Text examples for Android showing with and without stylistic features

Before and after in order:

<img width="1080" height="2400" alt="Before" src="https://github.com/user-attachments/assets/3d21a992-f36a-4ffe-a1b2-8da40b3ee399" />

<img width="1080" height="2400" alt="After" src="https://github.com/user-attachments/assets/f4ee208a-3f98-42d9-b8c2-5b122d2db383" />

Reviewed By: cortinico

Differential Revision: D90830140

Pulled By: philIip

fbshipit-source-id: 42dbb98641274c0d4c01c501662b2ae59e21927d

Author: petar.marinov

packages/react-native/ReactCommon/react/renderer/attributedstring/conversions.h

@@ -1076,6 +1076,66 @@ inline MapBuffer toMapBuffer(const FontVariant &fontVariant)
   if ((int)fontVariant & (int)FontVariant::ProportionalNums) {
     builder.putString(index++, "proportional-nums");
   }
+  if ((int)fontVariant & (int)FontVariant::StylisticOne) {
+    builder.putString(index++, "stylistic-one");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticTwo) {
+    builder.putString(index++, "stylistic-two");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticThree) {
+    builder.putString(index++, "stylistic-three");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticFour) {
+    builder.putString(index++, "stylistic-four");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticFive) {
+    builder.putString(index++, "stylistic-five");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticSix) {
+    builder.putString(index++, "stylistic-six");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticSeven) {
+    builder.putString(index++, "stylistic-seven");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticEight) {
+    builder.putString(index++, "stylistic-eight");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticNine) {
+    builder.putString(index++, "stylistic-nine");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticTen) {
+    builder.putString(index++, "stylistic-ten");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticEleven) {
+    builder.putString(index++, "stylistic-eleven");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticTwelve) {
+    builder.putString(index++, "stylistic-twelve");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticThirteen) {
+    builder.putString(index++, "stylistic-thirteen");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticFourteen) {
+    builder.putString(index++, "stylistic-fourteen");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticFifteen) {
+    builder.putString(index++, "stylistic-fifteen");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticSixteen) {
+    builder.putString(index++, "stylistic-sixteen");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticSeventeen) {
+    builder.putString(index++, "stylistic-seventeen");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticEighteen) {
+    builder.putString(index++, "stylistic-eighteen");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticNineteen) {
+    builder.putString(index++, "stylistic-nineteen");
+  }
+  if ((int)fontVariant & (int)FontVariant::StylisticTwenty) {
+    builder.putString(index++, "stylistic-twenty");
+  }
 
   return builder.build();
 }

packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/RNTesterApplication.kt

@@ -119,6 +119,7 @@ internal class RNTesterApplication : Application(), ReactApplication {
 
   override fun onCreate() {
     ReactFontManager.getInstance().addCustomFont(this, "Rubik", R.font.rubik)
+    ReactFontManager.getInstance().addCustomFont(this, "FiraCode", R.font.firacode)
     super.onCreate()
     loadReactNative(this)
   }

packages/rn-tester/android/app/src/main/res/font/firacode.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<font-family xmlns:app="http://schemas.android.com/apk/res-auto">
+  <font app:fontStyle="normal" app:fontWeight="400" app:font="@font/firacode_regular"/>
+</font-family>

packages/rn-tester/android/app/src/main/res/font/firacode_regular.ttf

@@ -389,6 +389,16 @@ function FontVariantsExample(props: {}): React.Node {
         1111{'\n'}
         2222{'\n'}
       </RNTesterText>
+      <RNTesterText style={{fontFamily: 'FiraCode'}}>
+        Non-Stylistic & and $
+      </RNTesterText>
+      <RNTesterText
+        style={{
+          fontFamily: 'FiraCode',
+          fontVariant: ['stylistic-three', 'stylistic-four'],
+        }}>
+        Stylistic & and $
+      </RNTesterText>
     </>
   );
 }