Add admin page at /admin/filtered-traffic showing domains blocked by the
referrer spam filter with reason badges and date range selector. Helps
operators monitor spam filtering and catch false positives.
All dates now use day-first ordering (14 Mar 2025) and 24-hour time
(14:30) via a single formatDate.ts module, replacing scattered inline
toLocaleDateString/toLocaleTimeString calls across 12 files.
