fix(article): align the back arrow with the title in compact mode

In the two-pane compact title bar the arrow sat slightly above
the first title line; offset it down to optically center it.

app/src/main/java/com/example/research/ui/article/ArticleScreen.kt

@@ -296,7 +296,7 @@ fun ArticleTitleBar(
         val titleLineHeight = with(LocalDensity.current) {
             MaterialTheme.typography.dictionaryTitleLarge.lineHeight.toDp()
         }
-        Modifier.offset(y = (titleLineHeight - 48.dp) / 2)
+        Modifier.offset(y = (titleLineHeight - 48.dp) / 2 + 3.dp)
     } else {
         Modifier
     }