issue 1072: implement file preview feature for .gz, .tar.gz, .xz, .tar.xz, .tgz and .7z archives

[kuchtiak-ufal]

Extended the File Preview feature for the following archive formats:

*.tar.gz
*.gz
*.tar.xz
*.xz
*.tgz
*.7z

See how it works:

[Copilot]

Pull Request Overview

This PR extends file preview support to include additional archive formats beyond the existing zip and tar support. The change adds support for gzip, gtar, xz, and 7z compressed files.

Key changes:

• Expanded the allowedPreviewFormats array to include 5 additional archive MIME types (gzip, gtar, xz, 7z)
• Refactored isArchive() method to use array indexing with allowedPreviewFormats.includes(format, 2) instead of explicit format checks

Comments suppressed due to low confidence (1)

src/app/item-page/simple/field-components/preview-section/file-description/file-description.component.ts:199

• The JSDoc comment for couldPreview() is outdated. It only lists three formats (text/plain, text/html, application/zip), but the allowedPreviewFormats array now includes 8 formats. Update the documentation to reflect all supported preview formats or reference the constant instead of hardcoding the list.

  /**
   * Supported Preview formats are: `text/plain`, `text/html`, `application/zip`
   */

[kosarko]

looks good

[kosarko]

@kuchtiak-ufal
what about application/x-gzip viz http://hdl.handle.net/11234/1-1581, http://hdl.handle.net/11234/1-5813 - maybe it's just missing in the FE PR?

[kuchtiak-ufal]

Fixed.