IQSS / dataverse-frontend / 25389631556 / 1

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Pull #898

github

A11y fixes flagged by Storybook's axe runner on FilesTree stories

Three axe violations on the new FilesTree.stories.tsx (Default +
PreExpanded), all in the tree-view diff:

- aria-progressbar-name (serious): the streaming-zip tray's progress
  bar had role='progressbar' but no accessible name. The tray is
  always rendered (just CSS-hidden), so the bar shows up in axe even
  when no zip is in flight. Added aria-label re-using the existing
  'tree.download.tray.label' string.
- aria-required-parent (critical) + empty-table-header (minor): the
  FilesTreeHeader marked itself with role='row' + role='columnheader'
  divs even though the tree uses the WAI-ARIA TREE pattern (not the
  GRID pattern). The 'row' had no 'rowgroup' / 'table' / 'treegrid'
  ancestor, and the actions column was empty. The header is purely
  visual — assistive tech reads structure off the role='treeitem'
  rows below — so the right fix is aria-hidden + drop the orphan
  roles. The empty actions column then becomes a plain spacer div.

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