fix(chart): add margins to radar chart examples to prevent label cutoff

[mahmoodhamdi]

What

Added explicit margins to all radar chart examples that were missing them, preventing axis label text from being clipped.

Why

All radar chart examples (except chart-radar-icons, chart-radar-legend, and chart-radar-label-custom which already had explicit margins) were using Recharts' default minimal margins. This caused PolarAngleAxis labels — especially longer month names like "February" — to be cut off at the container edges despite ample available space.

How

Added margin={{ top: 10, right: 10, bottom: 10, left: 10 }} to the <RadarChart> component in 11 example files, matching the pattern already used in chart-radar-label-custom.tsx.

Files changed (11):

• chart-radar-default.tsx
• chart-radar-dots.tsx
• chart-radar-multiple.tsx
• chart-radar-grid-none.tsx
• chart-radar-grid-fill.tsx
• chart-radar-radius.tsx
• chart-radar-lines-only.tsx
• chart-radar-grid-circle.tsx
• chart-radar-grid-circle-fill.tsx
• chart-radar-grid-circle-no-lines.tsx
• chart-radar-grid-custom.tsx

Testing

• Verified labels are fully visible in all radar chart variants
• The 3 files that already had explicit margins were left untouched

Closes #9948

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