Add aria-hidden="true" to decorative Font Awesome icons across templates,
aria-label to icon-only buttons, aria-live to dynamic content regions,
aria-labelledby to modals, aria-expanded to toggle buttons, scope="col"
to table headers, and aria-label to tables. Also improve alt text on
500.html error image and add aria-label to password toggle buttons.
Templates updated: settings.html, credentials.html, status_dashboard.html,
file_view.html, file_detail.html, index.html, queue_dashboard.html,
audit_log.html, 500.html
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
copilot-swe-agent[bot]
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