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

app/statistics/page.tsx

@@ -15,7 +15,6 @@ import {
   YearOverYearChart,
 } from "@/components/statistics";
 import { useBankingData } from "@/lib/hooks";
-import { getAccountBalance } from "@/lib/account-utils";
 import {
   Select,
   SelectContent,

app/transactions/page.tsx

@@ -19,8 +19,6 @@ import {
   normalizeDescription,
   suggestKeyword,
 } from "@/components/rules/constants";
-import { format } from "date-fns";
-import { fr } from "date-fns/locale";
 
 type SortField = "date" | "amount" | "description";
 type SortOrder = "asc" | "desc";