load geojson in worker

[digitaltom]

• fix sort order of overlayed features on click
• load geojson in maplibre web worker out of main thread

[Copilot]

Pull request overview

This PR updates the map data flow so GeoJSON feature payloads are no longer embedded in the default /m/:id.json response, and are instead streamed per-layer via a new /m/:id/layer/:layer_id.geojson endpoint to enable MapLibre to fetch + parse in its web worker. It also adjusts click-selection behavior to respect visual z-order for overlaid features and updates the “Map export” flow to request a self-contained export explicitly.

Changes:

• Add a per-layer GeoJSON endpoint and client-side layer streaming via source.setData(url) + getData() (worker parsing).
• Change default map JSON to return layer summaries only; gate embedded GeoJSON behind ?export=true.
• Fix click selection ordering for stacked/overlaid rendered features.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
spec/requests/maps_controller_spec.rb	Adds request specs for the new layer GeoJSON endpoint (success/404/permissions).
spec/models/map_spec.rb	Verifies default map JSON excludes embedded geojson and export mode includes it.
spec/features/map_share_spec.rb	Updates share UI expectation to use ?export=true for map export.
config/routes.rb	Adds a new route for /m/:id/layer/:layer_id.geojson.
app/views/maps/modals/_share.haml	Updates “Map export” link to include export=true.
app/views/maps/maplibre.haml	Removes the inline early-fetch script for map JSON.
app/models/map.rb	Changes to_json to optionally include embedded layer geojson via include_features:.
app/models/feature.rb	Ensures properties.id is populated for MapLibre promoteId:'id'.
app/javascript/maplibre/map.js	Avoids upsert diffs caused solely by properties.id and tweaks source log message.
app/javascript/maplibre/layers/layers.js	Reworks layer-definition loading to use gon on initial load + adds hidden-layer data loading.
app/javascript/maplibre/layers/layer.js	Adjusts click stack selection to prefer visual top feature, with stable cycling.
app/javascript/maplibre/layers/geojson.js	Streams geojson via URL so MapLibre parses in worker; reads back via getData() and avoids redundant re-parse when possible.
app/javascript/channels/map_channel.js	Forces refetch + resets memoization on reconnect to rebuild layers reliably.
app/controllers/maps_controller.rb	Adds #layer action, includes gon.map_layers, and toggles export embedding via params[:export].

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[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.