Improve contrast of mobile Markdown copy buttons (#32844)

mobile/src/session/MobileSessionMarkdownReader.tsx

@@ -81,7 +81,7 @@ export function MarkdownReader({
         ) : null}
         <View style={styles.markdownFloatingActions}>
           <Pressable
-            style={styles.markdownFloatingButton}
+            style={[styles.markdownFloatingButton, styles.markdownCopyButton]}
             onPress={onCopy}
             accessibilityRole="button"
             accessibilityLabel={
@@ -93,7 +93,7 @@ export function MarkdownReader({
             </Text>
           </Pressable>
           <Pressable
-            style={styles.markdownFloatingButton}
+            style={[styles.markdownFloatingButton, styles.markdownCopyButton]}
             onPress={onCopyPath}
             accessibilityRole="button"
             accessibilityLabel="Copy Markdown path"

mobile/src/session/mobile-session-review-comment-styles.ts

@@ -142,6 +142,10 @@ export const mobileSessionReviewCommentStyles = StyleSheet.create({
     paddingHorizontal: spacing.md,
     paddingVertical: spacing.xs
   },
+  markdownCopyButton: {
+    backgroundColor: colors.bgRaised,
+    borderWidth: 0
+  },
   markdownKeyboardDismissButton: {
     width: 34,
     justifyContent: 'center',