Activates the previously-disabled Visas tab on /admin/logistics.
VisasTab renders a flat table joined per attendee per project, sorted
by status priority. Status filter pills mirror the Confirmations tab.
The header carries a "Visible to teams" Switch backed by a new
logistics.getVisaVisibility query and the existing setVisaVisibility
mutation; toggling it controls whether members see their own status.
VisaEditDialog is a per-row editor with a status dropdown,
nationality input, three native date inputs (invitation / appointment
/ decision), and a notes textarea. No file uploads — the platform
deliberately holds zero document artifacts.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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