- style the settings-table dropdowns for the dark theme (were white)
- share-icon picker on one even row (no lopsided wrap)
- more breathing room between colour hex and swatch
- user management: promote/demote admin (new PUT /users/{id}/admin,
guarded against self-change and removing the last admin)
- calendar management table: clip/ellipsis cells so narrow columns no
longer overlap (full-width detail rows still wrap)
- centralise default colours: utils.applyTheme now derives every fallback
from settings-sync.DEFAULT_COLORS (single place for coders to edit)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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