fix: avoid duplicate day badge from animated header#2747
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After aligning the animated header's date with the visible group, the floating header could briefly show the same date as the inline day separator while that separator was still on screen, producing a stacked duplicate date badge during scroll. Gate the floating header's opacity on relativeScrolledPositionToBottomOfDay: only show it once the current day's inline separator has scrolled off the top (< 0). While the inline separator is still visible (>= 0) it already shows the date, so the floating copy stays hidden - a clean handoff with no duplicate.
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Follow-up to #2709
After #2709 aligned the animated day header's date with the visible group, an edge case surfaced: while scrolling, the floating header could show the same date as the inline day separator while that separator was still on screen, producing a stacked duplicate date badge (two "10 June" / two "17 June").
Fix
Gate the floating header's opacity on
relativeScrolledPositionToBottomOfDay: show it only once the current day's inline separator has scrolled off the top (< 0). While the inline separator is visible (>= 0) it already shows the date, so the floating copy stays hidden - a clean handoff, mirroring the inline separator's own opacity flip.Validation (Android simulator, multi-day chat)
tsc,eslint,buildpass; CI (Node 22 & 24) gates this PR.