chore: prepare release v8.39.0

[Antreesy]

v8.39.0 (2026-05-07)

Full Changelog

What's Changed

🚀 Enhancements

• [stable8] feat: change NcAppNavigationItem/NcListItem active state design and NcAppContent edge style on Nextcloud 34+ #8498 (nfebe)
• [stable8] feat(NcAppSidebarTab): Redesign active tab as rounded filled pill #8501 (nfebe)
• [stable8] feat(NcAppSettingsDialog): new navigation design #8503 (nfebe)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.85%. Comparing base (4f0ba16) to head (3612117).

Additional details and impacted files

@@           Coverage Diff            @@
##           stable8    #8511   +/-   ##
========================================
  Coverage    46.85%   46.85%           
========================================
  Files          195      195           
  Lines         4926     4926           
  Branches      1205     1205           
========================================
  Hits          2308     2308           
  Misses        2531     2531           
  Partials        87       87           

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[Antreesy]

see #8510 (comment)