Virtualize the unbounded social ActivityFeed list

[RUKAYAT-CODER]

Overview
src/components/social/ActivityFeed.tsx (lines 59-95) maps every grouped activity into the DOM with an IntersectionObserver appending more indefinitely, so the node count grows without bound and causes scroll jank on long sessions. Windowing/virtualization should cap the rendered node count.

[udoyechinenyevictoria]

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[Kleo-Crypt]

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[jaynomyaro]

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