The /admin/support page existed but was invisible from the panel — sidebar
NAV array didn't list it. Adds Support as the 2nd nav item (right after
Overview, since unanswered tickets are the most-time-sensitive thing an
admin checks). Sidebar polls /v1/admin/support/counts every 30s and renders
an amber count badge next to the entry when tickets are awaiting_admin.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
20910f5466
