Playtest #4 fixes: tile picking, knocked-down state, element gauges, draft timer, live stats, shop items, drones, 赫默, 炎佑, UI flash

- #1 picking by the tile under the pointer (prep, battle, pen, equipment drops); the dragged model stays
  under the pointer (mouse and touch); pixel probe removed; phone ghost-click on the underframe fixed
- #2 two-tap confirm on 机变 cards (like the shop)
- #3 a 同盟 room with one human is untimed like 独立模拟 (no countdown outside battles)
- #4 strategy draft: one synced countdown, 30 s per human turn, timeout takes the highlighted band
- #5 special 维式重锤 (4) and 突变细胞 no longer sold; item card shows where they come from
- #6 operator skill-mode sounds no longer play on normal attacks (纯烬艾雅法拉 and 55 others)
- #7 detail card shows live battle stats and the prep-time battle-start stats (g.unitStats)
- #8 official element gauges on units; burst cooldown (阻回) per PRTS
- #9 knocked-down operators stay on their tile with a redeploy countdown ring
- #10 drone behaviour per PRTS (暴鸰, 先兆者 shells, 黑云, 萨科塔之眼)
- #11 赫默's drone only from her skill; placeable summons limited to talent tokens
- #12 炎佑 stays where it is with no enemies; 祛恶之焰 as a continuous channel
- #13 the occasional giant bond icon (loading texture scaled ×46) fixed
- docs (DESIGN §18), recordings, data and tests updated (2467 unit tests, all browser suites green)

server/sim/content/choices.js

@@ -56,6 +56,7 @@
 //   Attribute bonuses are 直接乘算 (support/index.js convention): ×(1 + x) multipliers; flat values stay flat.
 
 import { gameData, num, buffsOf, passiveBuff, effectRecord } from './support/index.js';
+import { isShopItem } from '../simdata.js';
 
 // =====================================================================================================================
 // data helpers
@@ -166,10 +167,8 @@ export function choiceCardIds(data = gameData()) {
   for (const c of Array.isArray(cards.bounty) ? cards.bounty : []) if (c && c.effectId && !bounty.includes(c.effectId)) bounty.push(c.effectId);
   for (const c of Array.isArray(cards.tactic) ? cards.tactic : []) if (c && c.effectId && !tactic.includes(c.effectId)) tactic.push(c.effectId);
   const items = [];
-  for (const [id, it] of Object.entries((data && data.items) || {})) {
-    if (!it || it.isGolden || it.hideInShop || it.itemType !== 'EQUIP' || !Number.isInteger(it.tier)) continue;
-    items.push(id);
-  }
+  // the 道具补给 / 机密商店 cards draw shop items only (never the effect-only special 维式重锤 / 突变细胞)
+  for (const [id, it] of Object.entries((data && data.items) || {})) if (isShopItem(it)) items.push(id);
   return { bounty: bounty.sort(), tactic: tactic.sort(), items: items.sort() };
 }