refactor: clean up imports and improve code consistency across various components; remove unused imports in page.tsx, add missing imports in categories page, and standardize formatting in hooks and chart components

app/rules/page.tsx

@@ -39,7 +39,6 @@ export default function RulesPage() {
   const {
     data: transactionsData,
     isLoading: isLoadingTransactions,
-    invalidate: invalidateTransactions,
   } = useTransactions(
     {
       limit: 10000, // Large limit to get all uncategorized
@@ -49,7 +48,7 @@ export default function RulesPage() {
     !!metadata,
   );
 
-  const refresh = useCallback(() => {
+  const _refresh = useCallback(() => {
     invalidateAllTransactionQueries(queryClient);
     invalidateAllCategoryQueries(queryClient);
   }, [queryClient]);