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Phase 3 — tests (50 new, total now 1071): - test_cell_link_manager: atomicity (WG fail → DNS not called, link not persisted), DNS warning non-fatal, inbound_services arg, unknown service filtered, update/get permissions, lazy migration of legacy entries - test_wireguard_manager: subnet overlap rejection (exact, supernet, adjacent non-overlapping, different class-A, honours wg0.conf configured network) - test_firewall_manager: _cell_tag sanitisation, apply_cell_rules emits correct ACCEPT/DROP per service + catch-all DROP, clear_cell_rules no-op and exact line removal, apply_all_cell_rules iterates with correct args - test_cells_endpoints: RuntimeError→400, GET /services, GET/PUT permissions (200/400/404 paths, service name validation, arg forwarding) Phase 4 — UI: - CellNetwork.jsx: replace flat cell list with CellPanel expandable cards; add ServiceShareToggle (ARIA switch, saves immediately), InboundServiceBadge (read-only), DisconnectConfirmModal (replaces window.confirm); relative timestamps; paste validation on blur; WireGuard status merged by public_key - api.js: add cellLinkAPI.getPermissions, updatePermissions, getServices Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>