12da7ed593
A keyset only exists inside a card preset, but the SCP80/RAM/TAR keyset
selectors stayed enabled with no preset selected - showing either
"— no keyset —" or a stale "Keyset N — not defined in the preset" entry left
over from an earlier preset. spKeysetSync() now disables the selector and
reduces it to a "— select a card preset —" placeholder whenever its view has
no preset selected, and re-enables/populates it as soon as one is.
Clearing the preset dropdown ("— Select card —") also refreshed nothing:
cardsApply() returned before the sync, so the stale keyset list stayed; it now
syncs the selectors (and the preset warning) on the empty selection too.
The three selects get disabled:opacity-40 disabled:cursor-not-allowed (the
rules are already in the compiled style.css). Tests: keysets.test.js covers
the disabled/cleared state and the re-enable plus a cardsApply source guard;
cards_form.test.js and cards_counter.test.js gain tarPresetIdx in their
sandboxes. Help EN/RU and both AGENTS files; sw cache simple-v343.