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Drew McLellan
f5288eb1e2
## Problem The time-range dropdown above the request charts on the project home page resets on every visit, so users who prefer a different range have to re-select it each time. Resolves FE-2828. <img width="819" height="353" alt="Screenshot 2026-10-16 at 10 42 05" src="https://github.com/user-attachments/assets/cb8d467b-e709-43b0-9ae4-b02ebccf5faf" /> ## Solution Persist the selection in localStorage, keyed per project (`home-chart-interval-${ref}`), in both usage section variants (`ProjectUsageSection` and `ProjectUsageSectionDeltas`, chosen by the `newHomepageUsageDeltas` flag). - New `resolveChartInterval` helper validates the stored value against the known keys and the plan's log retention, falling back to the plan default for corrupt values or after a plan downgrade. Unit tested. - Removed the `useEffect` in `ProjectUsageSection` that reset the interval on retention change, since it would overwrite the saved value. - Moved `getDaysRequired` into `logs.utils.ts` so the dropdown and the helper share the retention check. Manually verified with the flag on and off: reload keeps the selection, and each project keeps its own.