Adjust font sizes

Reduce font sizes in several components for better readability and UI consistency.

src/components/ExpenseChart.tsx

@@ -27,7 +27,10 @@ const ExpenseChart: React.FC<ExpenseChartProps> = ({ data }) => {
             paddingAngle={5}
             dataKey="value"
             labelLine={true}
-            label={({ name, percent }) => `${name} ${(percent * 100).toFixed(0)}%`}
+            label={({ name, percent }) => (
+              `${name} ${(percent * 100).toFixed(0)}%`
+            )}
+            fontSize={12}
           >
             {data.map((entry, index) => (
               <Cell key={`cell-${index}`} fill={entry.color} />