Add layer_names property to nImage and refactor channel name logic

[TimMonko]

Description

Provides clean property API for getting the layer name, which is a combination of current nImage information, including the channel, scene and path stem. This allows us to adjust things in better abstracted pieces going forward, and is more similar to the rest of the nImage API. The layer names property returns a list corresponding to the number of layers that would be added.

This PR also removes the greedy get_single_channel_name and instead just directly uses lazy nImage.channel_names logic throughout.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

This PR refactors the layer naming logic in nImage by converting the private _build_layer_name method into a public layer_name property. This provides a cleaner, property-based API for accessing the base layer name (scene-qualified filename stem) while delegating channel name concatenation to call sites.

Changes:

• Adds a new public layer_name property that returns the scene-qualified filename stem
• Removes the private _build_layer_name method that previously handled both scene and channel naming
• Updates all call sites in get_layer_data_tuples to use the property and handle channel name prepending inline

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

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