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Restore a private marker's direction (and highlight_duration) when a project is reopened — _create_link_from_topology_data previously dropped them, silently reverting rx/tx markers to "both". Reject tx/rx direction on marker definitions with HTTP 409: a definition auto-selects its capture node per link and direction is relative to that node, so a fixed tx/rx has no stable project-wide meaning. Per-link markers still support tx/rx; only the project-wide definition is restricted to "both" (the default).