Auto handles 90%+ of cases — the row of category buttons was
visual noise on the main panel. Now:
- Removed the .research-category-row from above the textarea.
- Added a Format <select> inside Settings (next to Rounds) with
Auto / Product / Compare / How-to / Fact-check options. Default
is Auto, same as before.
- Updated all the JS that read .research-cat.active / data-cat to
read #research-category.value instead (_saveSettings, _readSettings,
_resetCategoryToAuto, _editJob, _restoreSavedSettings).
Same wire to the backend — settings.category still carries through.
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