Replace the per-device localStorage colour override with the server-backed
per-user colour: the colour dot on a shared calendar now PUTs /calendars/{id}/color
(stores the recipient's own colour server-side, synced across devices) and the
list/events already carry share.color from the server, so the localStorage
re-apply layer is removed. Owners and recipients share one code path. v74.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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