Tracked-flight and tracked-yacht HTML labels are rendered from the raw
store arrays, while their icons come from the worker GeoJSON that already
has the operator's data filters applied. Filtering Tracked Aircraft to a
category therefore removed the icons but left every other aircraft's name
on the map.
Derive the label subjects from the ids in the filtered feature collection
so a label is only drawn where an icon is. The id rule lives in one shared
helper used by both the worker builders and the label selector; rows with
no identifier keep the worker's positional fallback and draw no label.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
