allow grouped "track hub" style menu configuration from json

[jrobinso]

No description provided.

[Copilot]

Pull request overview

This pull request refactors the track configuration system to support grouped "track hub" style menu configuration from JSON files. The primary change is renaming the "sections" terminology to "groups" throughout the codebase to better align with track hub conventions, along with adding a sample JSON configuration file demonstrating the new grouped structure.

Key Changes

• Renamed "sections" to "groups" across all track configuration code for consistency with track hub terminology
• Added backwards compatibility in prepRegistryConfig to handle registries with or without explicit groups
• Created a new sample JSON configuration file (mm10_sample.json) demonstrating grouped track organization

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
resources/tracks/mm10_sample.json	New sample track configuration demonstrating grouped track hub format with genes and regulation categories
js/widgets/trackWidgets.js	Refactored annotateTracks parameter and references from "sections" to "groups"; updated prepRegistryConfig to support grouped format with fallback
js/widgets/trackSelectionModal.js	Renamed function parameter and all internal references from "sections" to "groups"; updated recursive rendering logic
js/widgets/trackSelectionListModal.js	Renamed function parameter and flattening logic from "sections" to "groups" for consistency

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[Copilot]

The track ID "HLTOGAannotvHg38v1" has inconsistent casing compared to the URL which contains "HLTOGAannotVsHg38v1" (note the capital "V" in "Vs"). Consider using consistent casing, such as "HLTOGAannotVsHg38v1" to match the URL filename.

Suggested change

	"id": "HLTOGAannotvHg38v1",
	"id": "HLTOGAannotVsHg38v1",

[Copilot]

[nitpick] For consistency with the refactoring from "sections" to "groups", consider renaming the HTML element IDs from collapseSection${index} to collapseGroup${index} to match the new terminology throughout the codebase.