Add flatgeobuf support

[m-mohr]

Just doesn't work yet at all 🙈 No requests are made.

[Copilot]

Pull Request Overview

This PR adds support for visualizing FlatGeobuf assets in STAC layers. The implementation enables rendering of FlatGeobuf files (an efficient binary format for geographic data) alongside existing formats like GeoJSON and GeoTIFF.

• Adds flatgeobuf package dependency and imports the OpenLayers loader
• Implements addFlatGeobuf_ method to create vector layers from FlatGeobuf assets
• Updates asset visualization logic to detect and render FlatGeobuf format

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/ol/layer/STAC.js	Adds FlatGeobuf support with new import, media type check, and visualization methods
package.json	Adds flatgeobuf ^4.3.1 dependency
examples/stac-item-flatgeobuf.js	Provides example implementation showing FlatGeobuf asset rendering
examples/stac-item-flatgeobuf.html	HTML template for the FlatGeobuf example
CHANGELOG.md	Documents the new FlatGeobuf visualization feature

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

The first parameter to createLoader is null. According to the flatgeobuf OpenLayers API, this should be the feature projection. Consider passing a proper projection here or document why null is acceptable.

Suggested change

	null,
	getProjection(this),

[Copilot]

The createLoader function is called with the source as the second parameter, but then source.setLoader is called immediately after. This appears redundant - createLoader typically either returns a loader to be set manually OR sets it on the source internally. Verify the correct usage pattern for flatgeobuf's createLoader API.

Suggested change

	const loader = createLoader(
	null,
	source,
	asset.getAbsoluteUrl(),
	bboxStrategy,
	);
	source.setLoader(loader);
	createLoader(
	null,
	source,
	asset.getAbsoluteUrl(),
	bboxStrategy,
	);

[Copilot]

Grammatical improvement: 'as layer group' should be 'as a layer group'.

Suggested change

	Geometry and FlatGeobuf Assets from SpatioTemporal Asset Catalog (STAC) Items can be rendered as layer group.
	Geometry and FlatGeobuf Assets from SpatioTemporal Asset Catalog (STAC) Items can be rendered as a layer group.