feedback7: merge fb7-ui-backlog — #229 device tooltips, #238 settings button in lobby / room, #138 准备 folds the shop, #120 in-match spectator roster (cap stays 2), PR #308 capsule counts (+ the shared-field progress fix), PR #333 empty new shop slot on 调度中心 upgrade

- Conflicts: the stats entry (merged fb7-stats) and the settings button both sit in the lobby / room top bars — both kept;
  public/js/ui/settings.js (#321 diagnostics, voiceLang, SettingsButton); docs/PLAYING.md table rows resolved line by
  line against the merge base (#368, #354, #333 edits kept); docs/SIM.md / design/network.md snapshot field lists
  (resolved + ammo / wolves / neg / stand / standCut); design/client.md Screens line (#368's AI switch kept).
- Grok review: MERGE AFTER FIXES — the shared-field capsule finding fixed on the branch (1a880699).
- Golden: roster 23, bonds 2, fields 11, matches 18, diy 11 — #308 totals / snapshots and #333's shop RNG (union OK);
  broad node --test 5473 (5472 pass, 0 fail, 1 skipped); lint 0 errors; typecheck; i18n strict clean.

server/match/player/economy.js

@@ -93,11 +93,14 @@ export class PlayerEconomy {
   }
 
   /**
-   * The 调度中心's upgrade opens the new level's extra slots at once, each with a new card drawn at the new level; the
-   * cards already shown stay where they are (chess slots keep their index, the item slot stays after them). Official: the
-   * tutorial's 休整期 page 「升级：…升级后将出现更多的商品栏位、可调度干员以及新装备」; the community report of 2026-10-06
-   * (item 19) 「升级商店获得新的商店位时用新卡补上，而不是空着」. Until 0.2.0 the extra slots waited for the next roll (a
-   * refresh or the round start). [ASSUMED] the new card follows the freeze toggle, as a manual refresh's cards do.
+   * The 调度中心's upgrade opens the new level's extra slots at once — EMPTY: no card is drawn into them (a `null` slot).
+   * The next roll (a manual refresh or the round start) fills them with the other unfrozen slots; the cards already shown
+   * stay where they are (chess slots keep their index, the item slot stays after them). Official: the footage of a 1→2
+   * upgrade (bilibili BV1AXwuzdEys 1:39, GitHub #332 / PR #333 by @2321Robin) shows the new slot appear and stay empty, and
+   * the texts only name the slots — the tutorial's 休整期 page 「升级后将出现更多的商品栏位」, PRTS 帮助 「增加刷新栏位」 —,
+   * never a card that comes with them. 0.2.0 drew a card into each new slot instead (item 19 of the community report of
+   * 2026-10-06, 「升级商店获得新的商店位时用新卡补上，而不是空着」, one uncorroborated remark; its follow-on, that the new card
+   * follows the freeze toggle, was [ASSUMED]); until then the extra slots waited for the next roll as well.
    */
   _openLevelSlots() {
     const { chess: nChess, item: nItem } = this.gd.shopSlots(this.shop.level);
@@ -106,9 +109,8 @@ export class PlayerEconomy {
     if (nChess <= layout.chess && nItem <= layout.item) return;
     const chess = old.slice(0, layout.chess);
     const items = old.slice(layout.chess);
-    const fresh = (s) => { if (s) s.frozen = this.shop.frozen; return s; };
-    while (chess.length < nChess) chess.push(fresh(this._rollChessSlot()));
-    while (items.length < nItem) items.push(fresh(this._rollItemSlot()));
+    while (chess.length < nChess) chess.push(null);
+    while (items.length < nItem) items.push(null);
     this.shop.slots = [...chess, ...items];
     this.shop.layout = { chess: chess.length, item: items.length };
   }