fix: BurnChart tooltip dates off by one in western timezones#16
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new Date("2026-04-06") parses as UTC midnight, but toLocaleDateString
renders in the browser's local timezone. In US timezones this rolls the
displayed date back one day, making the BurnChart tooltip show "Apr 5"
for data that the UnvestingChart correctly labels "Apr 6".
Add timeZone: 'UTC' to keep the tooltip consistent with the server-
computed displayDate used everywhere else.
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Summary
new Date("2026-04-06")parses as UTC midnight per spec, buttoLocaleDateString()without atimeZoneoption renders in the browser's local timezone. In any UTC-negative timezone (all of the Americas), the tooltip date rolls back one day.timeZone: 'UTC'to thetoLocaleDateStringcall in the BurnChart tooltip, matching the server-sidedisplayDatecomputation.