Drop the two approval-date pickers from the PO History filter bar per
the manager's request — they were deemed unnecessary. Removes the
inputs, their useState hooks, and their entries in buildParams/clear/
hasFilters.
The approvedFrom/approvedTo URL params are left intact server-side
(page.tsx, lib/history-filter.ts, export route) so existing deep-links
from the dashboard "Approved This Month" card and the report drill-downs
keep pre-filtering History by approval date.
Fixes#136
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
5218eb3717