refactor: remove unused imports and improve variable naming for clarity in statistics and transactions components

components/statistics/category-pie-chart.tsx

@@ -10,7 +10,6 @@ import {
   Cell,
   Tooltip,
   ResponsiveContainer,
-  Legend,
 } from "recharts";
 import { Layers, List, ChevronDown, ChevronUp } from "lucide-react";
 import type { Category } from "@/lib/types";
@@ -38,7 +37,7 @@ interface CategoryPieChartProps {
 export function CategoryPieChart({
   data,
   dataByParent,
-  categories = [],
+  categories: _categories = [],
   formatCurrency,
   title = "Répartition par catégorie",
   height = 300,