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/kits/tier3.js

@@ -1149,7 +1149,7 @@ const KITS = {
   },
 
   // ---- 3_15 巫恋 · 削弱者 (hidden) — S2 诅咒娃娃: places the doll (auto-placed on the tile of the range covering most
-  //      enemies; replaces any doll of hers still standing, the prep-phase board piece included) whose 3×3 aura lowers
+  //      enemies; replaces any doll of hers still standing — the doll is never a prep hand card) whose 3×3 aura lowers
   //      enemy ATK/DEF, gone after 15 s; 溃败暗示: low-HP enemies fragile
   chess_char_3_15_a: (bb, chess, def) => {
     const d = defOf(chess, def);
@@ -1171,8 +1171,8 @@ const KITS = {
           const life = num(tok?.skill?.duration, 0) > 0 ? tok.skill.duration : textNum(d.skill?.description, /(\d+)秒后自动销毁/, 15);
           const grid = tok?.rangeGrid ?? NINE;
           const reach = Math.max(1, ...grid.map((p) => Math.max(Math.abs(p[0]), Math.abs(p[1]))));
-          // "最多可库存1个" / deploy limit 1: the new doll replaces any doll of hers still standing (the board piece
-          // placed in the prep phase included) — withdrawn first so its tile is available again
+          // "最多可库存1个" / deploy limit 1: the new doll replaces any doll of hers still standing — withdrawn first
+          // so its tile is available again
           for (const t of tokensOf(battle, unit, tokenId)) if (t.alive) battle.retreat(t, { reason: 'expired', permanent: true });
           const foes = battle.aliveEnemies().filter((e) => !e.hidden);
           let best = null, bs = -1, bd = Infinity;