feat(ui): add LetterSpacing and LineHeight methods to View

ui/modifiers.go

@@ -175,3 +175,13 @@ func (v View) TextDecoration(value string) View {
 	v.e.Get("style").Call("setProperty", "text-decoration", value)
 	return v
 }
+
+func (v View) LetterSpacing(spacing string) View {
+	v.e.Get("style").Call("setProperty", "letter-spacing", spacing)
+	return v
+}
+
+func (v View) LineHeight(height string) View {
+	v.e.Get("style").Call("setProperty", "line-height", height)
+	return v
+}