Stripe checkmark emojis from display names (close #396) (#419)

src/lib/strings/display-names.ts

@@ -0,0 +1,12 @@
+// \u2705 = ✅
+// \u2713 = ✓
+// \u2714 = ✔
+// \u2611 = ☑
+const CHECK_MARKS_RE = /[\u2705\u2713\u2714\u2611]/gu
+
+export function sanitizeDisplayName(str: string): string {
+  if (typeof str === 'string') {
+    return str.replace(CHECK_MARKS_RE, '')
+  }
+  return ''
+}