The custom Node.js and Python choices could appear unavailable until a candidate was already discovered, and selecting the source implicitly adopted the first candidate. The chooser now stays operable, waits for an explicit validated path, keeps cancellation quiet, and shows validation errors beside the affected runtime.
Candidate discovery now prioritizes active virtual environments and Conda before bounded user/system PATH and common Node/Python locations, while preserving canonical validation and deduplication.
Release note: 修复自定义 Node.js/Python 环境入口不可用的问题，并增加对 PATH、venv、Conda 和常见安装位置的解释器检测。
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