fix(android): track vertical gravity in DrawCommandSpan draw offset

The DrawCommandSpan draw block in `ReactTextView.onDraw` translated by
`getCompoundPaddingLeft(), getExtendedPaddingTop()` only, which works
for the default `Gravity.TOP` text alignment. When `textAlignVertical`
is `center` or `bottom` and the text is shorter than the view, the
glyphs are positioned by `super.onDraw` with an additional gravity
offset that the span draws were missing — so colored
underline/strikethrough rendered at the top of the view while the text
itself was vertically centered or bottom-aligned.

Recompute the offset locally (mirroring TextView.getVerticalOffset(),
which is private upstream) and add it to the translate before invoking
the span draws.

## Changelog

[ANDROID] [FIXED] - Custom text decorations track `textAlignVertical`

## Test Plan

Render a `<Text style={{ height: 200, textAlignVertical: 'center', textDecorationLine: 'underline', textDecorationColor: '#ff00aa', fontSize: 24 }}>Hello</Text>` inside a fixed-height parent and verify the magenta underline sits flush under "Hello" in the vertical center. Repeat with `textAlignVertical: 'bottom'`. Both now track the text; previously the underline stayed at the top of the box. Verified on Android API 36 emulator.

Author: quantizor

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/text/ReactTextView.java

@@ -221,8 +221,25 @@ protected void onDraw(Canvas canvas) {
           DrawCommandSpan[] drawSpans =
               spanned.getSpans(0, spanned.length(), DrawCommandSpan.class);
           if (drawSpans.length > 0) {
+            // Mirror TextView.getVerticalOffset() — it's private upstream so we
+            // recompute the gravity-driven offset that `super.onDraw` applies
+            // before painting glyphs. Without this the span draws would land at
+            // the top of the view while text is centered or bottom-aligned.
+            int voffsetText = 0;
+            if ((getGravity() & Gravity.VERTICAL_GRAVITY_MASK) != Gravity.TOP) {
+              int boxHeight =
+                  getMeasuredHeight() - getExtendedPaddingTop() - getExtendedPaddingBottom();
+              int textHeight = layout.getHeight();
+              if (textHeight < boxHeight) {
+                int v = getGravity() & Gravity.VERTICAL_GRAVITY_MASK;
+                voffsetText =
+                    (v == Gravity.BOTTOM)
+                        ? (boxHeight - textHeight)
+                        : (boxHeight - textHeight) / 2;
+              }
+            }
             canvas.save();
-            canvas.translate(getCompoundPaddingLeft(), getExtendedPaddingTop());
+            canvas.translate(getCompoundPaddingLeft(), getExtendedPaddingTop() + voffsetText);
             for (DrawCommandSpan span : drawSpans) {
               int start = spanned.getSpanStart(span);
               int end = spanned.getSpanEnd(span);