Setting epSel.value triggered an async change event whose handler
called refreshModels('') — wiping the correct model selection that
refreshModels(settings.default_model) had just applied moments earlier.
The dropdown silently fell back to the alphabetically-first model
(deepseek-v4-flash instead of qwen-3.6-35B-A3B).
Moved the change listener registration to after the settings block
so the async change event fires before any listener exists. The
utility and teacher sections already followed this pattern.
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