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Marc-André Bombeck
fe94299122
Pre-v1.4.33 the insights mother page AND `<SubPageShell>` both fired
their own `requestAnimationFrame -> window.scrollTo({top:0})` on mount.
On slow hydrates the two callbacks landed ~16 ms apart and the second
one re-snapped the viewport once the chart skeleton inflated -- a
visible double-snap the maintainer flagged as "viewport jumps on click".
- src/hooks/use-scroll-reset-on-route.ts: new hook owns the RAF +
scrollTo dance, behaviour:"auto" so `prefers-reduced-motion` users
get the same instant landing everyone else does.
- src/components/insights/sub-page-shell.tsx: drop the inline effect,
call the hook. The opt-in `focusOnMount` ref-focus stays as its own
separate effect (different opt-in surface).
- src/app/insights/page.tsx: drop the duplicate effect, call the hook.
Refs .planning/round-v1433-audit-polish.md §2.1 + Win 3.