fix: don't try to show animation for + character

Closes #319

src/components/is-hanzi.ts

@@ -6,5 +6,5 @@
  * in the Hanzi fields.
  */
 export function isMaybeHanzi (candidate: string): boolean {
-  return /^[^\s\p{Ps}\p{Pe}\p{Po}\p{Pd}\p{Ll}\p{Lu}]+$/u.test(candidate)
+  return /^[^\s\p{Ps}\p{Pe}\p{Po}\p{Pd}\p{Ll}\p{Lu}\p{Sm}]+$/u.test(candidate)
 }