refactor: extract shared withdrawal utils and fix status badge fallbacks

- extract formatDate, statusBadgeConfig, getRiskColor to shared utils
- use explicit unknown fallback for unrecognized status values
- add missing 'unknown' i18n keys for withdrawal status

src/locales/en.json

@@ -1825,7 +1825,8 @@
         "approved": "Approved",
         "rejected": "Rejected",
         "completed": "Completed",
-        "cancelled": "Cancelled"
+        "cancelled": "Cancelled",
+        "unknown": "Unknown"
       },
       "detail": {
         "title": "Withdrawal",