v0.6.0

Added

• Clickable author in the addin detail panel — when a registry entry supplies
  the new optional authorUrl field, the author name in the "by …" line becomes a
  link to the developer's page (e.g. their GitHub profile). Entries without
  authorUrl render exactly as before (plain gray text), so this is fully backward
  compatible. Implemented by promoting the author label to a LinkLabel and linking
  only the name portion via LinkArea.