fix: adjust stats grid to use responsive 2-/4-column layout (#998)

[Xenon010101]

Description\nFixes the stats grid in GuideListPage showing 4 stat cards in a `grid-cols-3` layout, causing the 4th card to wrap awkwardly on the next line.\n\n## Changes\n- Changed `grid-cols-3` to `grid-cols-2 md:grid-cols-4` so stats display in 2 columns on mobile and 4 columns on desktop\n\nCloses #998

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• client/src/module/student/opensource/components/GuideListPage.tsx

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