Create Combined View for JAR and POM Files in Maven Artifacts

Description:

When browsing the cache, users need JAR and POM files to be displayed as a single expandable artifact for improved usability and to match Maven's conceptual model.

User Story:

As a user browsing the Maven Virtual Registry cache, I need JAR and POM files to be grouped as a single expandable artifact, So that I can more easily understand the complete artifact and its metadata.

Acceptance Criteria:

• Display related JAR and POM files as a single expandable artifact
• Show metadata from both files in the combined view
• Maintain the ability to download individual files
• Visual indication of all components in the artifact
• Proper handling of artifacts with multiple JAR files (with classifiers)

Value:

This improvement makes the cache browsing experience more intuitive, matching how Maven conceptually treats these artifacts. It reduces confusion and improves efficiency when examining cached artifacts.

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