feat: expose read-only layer queries to external plugins

[Jihkk]

Summary

• expose optional read-only layer and feature query methods to external plugins
• expose the selected layer, all selected features, sketch features, and selection-change subscriptions
• document compatibility and cleanup behavior for plugin authors
• add focused tests for selection, layer lookup, sketch filtering, missing IDs, and unsubscribe behavior

Why

External plugins can add layers, but they currently cannot inspect GeoLibre's current layer list or feature selection through the public plugin API. Plugins that need to run an analysis for a user-selected feature therefore have no supported read-only path to obtain that context.

The new methods remain optional so existing plugins can continue to run against older GeoLibre hosts. The query surface does not mutate the application store, and subscription callers receive an unsubscribe function for plugin cleanup.

API

• listLayers()
• getLayerFeatures(layerId)
• getSelectedFeatures()
• getSelectedLayerId()
• getDrawnFeatures()
• onSelectionChange(callback)

Validation

• node --import tsx --test tests/plugin-query-api.test.ts — 7 passed
• npm run lint — 0 errors (40 existing warnings)
• npm run build — passed

The API was also exercised from an external hydrology plugin in the Tauri desktop during a synthetic end-to-end workflow.

[coderabbitai]

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