_fetch_banner_candidates collects (overdue) OR (critical-customer +
open) records per type. _critical_customer_ids reuses partner.x_fc_rush
and partner.x_fc_vip flags when defined (gracefully no-ops when
absent). _critical_badge returns RUSH/VIP/AEROSPACE/AS9100 label
when the banner reason is critical-customer (no badge when overdue).
_build_banner ranks: overdue first by oldest, then critical-customer
by oldest, takes top 6, reports total_matching.
build() now collects banner candidates from every section in one
pass + invokes _build_banner once.
Tests cover overdue hold pickup, 6-cap with overflow count, and
all_clear when DB is empty.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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