Fix TypeScript errors

Addresses TypeScript errors related to toast implementation and type definitions.

src/components/expenses/ExpenseForm.tsx

@@ -83,7 +83,6 @@ const ExpenseForm: React.FC<ExpenseFormProps> = ({ onSubmit, onCancel, isSubmitt
               <ExpenseCategorySelector 
                 value={field.value} 
                 onValueChange={(value) => field.onChange(value)}
-                disabled={isSubmitting}
               />
             </FormItem>
           )}