Markers now carry a caller-supplied x/y/z instead of an auto-resolved
terrain height: clicking the map opens a real Leaflet popup pre-filled
with the clicked x/z, a default y of 60, and a random color, all
editable before saving. The same popup now also opens for editing an
existing marker (new updateMarker/PATCH /api/markers/:markerId, TDD'd
in markers.test.ts/index.test.ts). Removes the now-unused
resolveHeight/GET /api/height machinery. Linked-account markers
already synced server-side via the markers table, so cross-device
sync falls out of the existing loadMarkers()-on-init flow.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015tKdPZt78zbPUZMXWzKEKt
octoturge
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