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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>