The input was bound straight to the number and committed on every keystroke, so
it could not be EMPTIED: clearing it yields "", Number("") is 0, 0 fails the
"> 0" guard, the state never moved, and value={qsoLimit} snapped the old figure
straight back. Going from 200000 down to 100 was a fight against the field — and
read as the setting refusing to persist, which it was not: writeUiPref stores it
and syncPortablePrefs makes the database authoritative at boot. It also wrote
the preference once per keystroke (1, then 10, then 100).
Raw text in local state, committed on blur or Enter, per the controlled-input
note in CLAUDE.md.
rouggy
31f9bdfc98