fix: enable horizontal scroll for contribution chart on mobile

[AbhiVarde]

Problem

On mobile devices, the contribution chart was not horizontally scrollable,
causing months beyond May/June to be cut off and inaccessible.

Root Cause

Two issues were blocking the scroll:

• overflow-hidden on the grid column inside contribution-chart.tsx was
  clipping the scroll container, preventing it from calculating its true width
• The chart wrapper card in user-profile-content.tsx had no overflow
  handling, allowing content to bleed outside the rounded border

Solution

• contribution-chart.tsx: Changed overflow-hidden → min-w-0 on the
  grid column so the scroll container can expand to its natural width
• user-profile-content.tsx: Added overflow-hidden to the chart wrapper
  card to cleanly clip content within the rounded border

Files Changed

• apps/web/src/components/dashboard/contribution-chart.tsx
• apps/web/src/components/users/user-profile-content.tsx

Screenshots

Before	After

[vercel]

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