Improve parsing labels for range question

GitHub Issue #7178 - getodk/collect Labels at the end of range questions are not visible when the step is set to a decimal value. With step set to 1 (integer), labels display correctly. The problem occurs when choices are represented as decimal values for integer questions, and vice versa -- integer values for decimal questions. The parsing logic needs to handle both decimal and integer representations correctly regardless of the question type. Priority: High. This affects form usability for any form using range questions with decimal steps.