feedback7 R22-HUD: the card 梓兰's 猎头顾问 freezes shows its frost — every shop card draws its own slot's freeze, not the toggle's (GitHub #354 by @DuolaCCCCat); golden: unchanged

Seen (reproduced on the parent, notes repro-354.mjs): band_orchid's active refresh copies the top-tier operator into another
slot and freezes the copy (bands/meta.js band_shop_refresh_copy_max_lv_char, slot.frozen = true) while shop.frozen — the
toggle — stays false; m.private sends both (views.js: shop.frozen and slots[i].frozen). The shop bar passed the toggle
(`frozen = !!shop.frozen`) to every ChessCard / ItemCard, so no card showed the frost: the server kept the card to the next
prep, the player could not see which one.

Now: shopBar.js slotFrozen(slot, toggle) = the slot's own flag, or the toggle (a frame without per-slot flags — the dev
mock — and the old behaviour for the 冻结 button, which still copies the toggle onto every unsold slot); both card kinds
use it. The bar's frame (is-frozen) and the 冻结 / 解冻 button stay on the toggle. The rule is not touched (bands.test.js,
and the new test): a second manual refresh re-rolls the frozen card too — like the toggle, "再手动刷新会重抽" — and
freezes one of the new pair; with no further refresh the frozen card stays in the next prep (the flags are cleared
then, round.js startRound).

- Tests: test/ui/feedback7-orchid-freeze.test.js (4: the wire — exactly one frozen card of the pair, toggle off — and the
  cards drawn from it; the toggle still freezes every slot; the rule unchanged across two refreshes and a round; the
  ShopBar source pin); fails on the parent (no slotFrozen, the cards passed `frozen`).
- Docs: PLAYING.md (冻结 row), design/network.md (m.private slot.frozen). Golden: unchanged (client render only).

docs/design/network.md

@@ -36,7 +36,7 @@ S→C:
 ```js
 { playerId, seat, alive, lp, funds, bandId, ready, canReady /* false while temp non-empty */,
   shop: { level, maxLevel: 6, upgradePrice, refreshPrice /* effective (0 when a free refresh is available) */, freeRefreshes,
-          frozen, slots: [ { kind: 'chess'|'item', id, price, basePrice, sold } | null ],
+          frozen, slots: [ { kind: 'chess'|'item', id, price, basePrice, sold, frozen } | null ],  // slot.frozen: the 冻结 toggle copies onto every unsold slot, and 梓兰's 猎头顾问 freezes ONE card of an active refresh with the toggle off — every card draws its own flag (GitHub #354)
           rewardOffer: null | { tier, source: 'merge'|'special', label, queued, slots: [ { kind: 'chess'|'item', id, price: 0, sold } ] } },  // §21.2
   hand:  [ Piece | null ],   // length 10, index = hand slot
   temp:  [ Piece | null ],   // length 5