fix(ios): re-seed paragraphStyle on typed TextInput text so baseline offset applies

The prior Fabric fix calls RCTApplyBaselineOffset on the incoming
attributedString in _setAttributedString, but on each keystroke the
attributedText that round-trips UIKit → Fabric state → back drops
NSParagraphStyleAttributeName: UIKit's typingAttributes does not carry
the paragraph style, and _updateState stores the stripped attributedText
verbatim as an OpaquePointer in TextInputState.

Without a paragraph style on the incoming string,
RCTApplyBaselineOffsetForRange reads maximumLineHeight == 0 and returns
early, so NSBaselineOffsetAttributeName never lands on typed text and
glyphs end up pinned to the bottom of the paragraphStyle-sized line box.

Re-seed the paragraph style from defaultTextAttributes on any range that
lacks it (or carries a zero-lineHeight stub) before calling the helper,
so the baseline offset is computed and applied.

Author: janicduplessis

packages/react-native/React/Fabric/Mounting/ComponentViews/TextInput/RCTTextInputComponentView.mm

@@ -768,6 +768,26 @@ - (void)_restoreTextSelectionAndIgnoreCaretChange:(BOOL)ignore
 
 - (void)_setAttributedString:(NSMutableAttributedString *)attributedString
 {
+  // When the user types, UIKit's typingAttributes drop NSParagraphStyleAttributeName, so the
+  // attributedText round-tripping back through state lacks the paragraph style that
+  // RCTApplyBaselineOffset needs. Re-seed paragraph style from defaultTextAttributes on ranges
+  // that are missing it or carry a zero-lineHeight stub, so the helper can compute the offset.
+  NSParagraphStyle *defaultParagraphStyle =
+      _backedTextInputView.defaultTextAttributes[NSParagraphStyleAttributeName];
+  if (defaultParagraphStyle && attributedString.length > 0) {
+    [attributedString
+        enumerateAttribute:NSParagraphStyleAttributeName
+                   inRange:NSMakeRange(0, attributedString.length)
+                   options:0
+                usingBlock:^(NSParagraphStyle *style, NSRange range, __unused BOOL *stop) {
+                  if (!style || style.maximumLineHeight == 0) {
+                    [attributedString addAttribute:NSParagraphStyleAttributeName
+                                             value:defaultParagraphStyle
+                                             range:range];
+                  }
+                }];
+  }
+
   RCTApplyBaselineOffset(attributedString);
 
   if ([self _textOf:attributedString equals:_backedTextInputView.attributedText]) {