fix(charts): round only top/right corners of bars instead of all four corners

[creazyfrog]

Summary

• Fixes [bug]: Bar chart examples round the bottom of bars, reducing visual accuracy #10741: Bar chart registry examples applied a uniform radius={N} which rounds all four corners including the bottom edge that sits on the axis baseline
• Rounded bottoms create a small visual gap between the bar and the baseline, making heights harder to compare accurately and undermining trust in the data

Changes

All changes are in apps/v4/registry/new-york-v4/charts/:

File	Before	After
chart-bar-default.tsx	radius={8}	radius={[8, 8, 0, 0]}
chart-bar-active.tsx	radius={8}	radius={[8, 8, 0, 0]}
chart-bar-label.tsx	radius={8}	radius={[8, 8, 0, 0]}
chart-bar-multiple.tsx (×2)	radius={4}	radius={[4, 4, 0, 0]}
chart-bar-label-custom.tsx	radius={4}	radius={[4, 4, 0, 0]}
chart-bar-mixed.tsx	radius={5}	radius={[5, 5, 0, 0]}
chart-bar-horizontal.tsx	radius={5}	radius={[0, 5, 5, 0]}

In Recharts the array form is [topLeft, topRight, bottomRight, bottomLeft]:

• Vertical bars grow upward → round top corners only: [N, N, 0, 0]
• Horizontal bars grow rightward → round right corners only: [0, N, N, 0]

Testing

Visual-only change. Default appearance is improved: bars now sit flush on the axis baseline. No logic or data changes.

Closes #10741

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