Fix: TypeScript error in ChartCard

Error: 'percent' is possibly 'undefined'
Fix: (percent || 0) para garantir fallback

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/dashboard/chart-card.tsx

@@ -163,7 +163,7 @@ export function ChartCard({
                 cx="50%"
                 cy="50%"
                 labelLine={false}
-                label={({ name, percent }) => `${name} (${(percent * 100).toFixed(0)}%)`}
+                label={({ name, percent }) => `${name} (${((percent || 0) * 100).toFixed(0)}%)`}
                 outerRadius={100}
                 fill="#8884d8"
                 dataKey={dataKey}