[ChangkeunJ]

The fix for #4545 moved annotation storage and display to the app timezone, but the marker lookup in getChartBucketIndex still reads bucket labels with new Date('yyyy-MM-dd'), which lands on UTC midnight. The time scale parses the same label as local midnight, so for browsers east of UTC the lookup picks the previous bucket and day, month and year markers print one step early, even with the app timezone left at its browser default.

This adds getChartBucketTime, which parses a bucket the way the scale does, and Chart.tsx now parses the bucket list once per layout instead of once per annotation. New tests cover raw timestamps and local day and month matching across Asia/Seoul, Europe/Copenhagen, UTC and America/Los_Angeles.

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[greptile-apps]

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge; no actionable issues were found.

Summary

Fixes annotation bucket lookup by reading date-only labels as local dates instead of UTC dates.

• Annotation markers line up with the chart’s local-time buckets.

No actionable issues were found. Tests and browser checks were not run.

_{Reviews (1) · Last reviewed commit: "fix: keep annotation markers on the righ..." · Reviewed by Greptile}