feat(grafana): set Desert Bloom as default theme

Nikolay Samokhvalovrequested to merge
feat/grafana-desert-bloom-theme into main

Summary

  • Set default_theme = desert_bloom in grafana.ini [users] section
  • All new users and anonymous viewers will see the Desert Bloom theme by default
  • Users can still override in their personal profile settings

Closes #146 (closed)

Test plan

  • Deploy locally with postgresai mon local-install --demo and verify Grafana opens with Desert Bloom theme
  • Confirm users can still switch themes in profile settings

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