Remove unnecessary chart elements

Removes label lines from pie charts and percentage display from payment method chart.

src/components/ExpenseChart.tsx

@@ -26,7 +26,7 @@ const ExpenseChart: React.FC<ExpenseChartProps> = ({ data }) => {
             outerRadius={60}
             paddingAngle={5}
             dataKey="value"
-            labelLine={true}
+            labelLine={false}
             label={({ name, percent }) => (
               `${name} ${(percent * 100).toFixed(0)}%`
             )}