Exclude income transactions from budget transactions list

Salary/deposit transactions were showing in the "Efectivo y
Transferencias" tab on the Budget page with a negative sign,
which is confusing since that view is for expenses only.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/pages/Budget.tsx

@@ -68,7 +68,9 @@ export default function Budget() {
       }
 
       const { data } = await api.get<Transaction[]>('/transactions/', { params });
-      setTransactions(data);
+      const INCOME_TYPES = ['DEPOSITO', 'SALARY'];
+      const filtered = data.filter((tx) => !INCOME_TYPES.includes(tx.transaction_type));
+      setTransactions(filtered);
     } finally {
       setTxLoading(false);
     }