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)

public/css/screens/loadout.css

@@ -316,10 +316,9 @@
   font-size: .8em; font-weight: 700; color: var(--text-on-mint); background: var(--mint-500); border-radius: 1em;
 }
 
-/* Untimed phases (user playtest #11: the official 独立模拟 shows no countdown outside combat — the server sends
-   deadline 0 for them, Match.soloUntimed): ui/components.js Countdown renders its "无倒计时" placeholder ("--" digits +
-   COUNTDOWN label), which reads as a timer — it is not shown at all. (Owner of components.js: returning null there
-   for a missing deadline makes this rule a no-op.) */
+/* Untimed phases (user playtest #11 / #4 item 3: the official 独立模拟 shows no countdown outside combat — the server
+   sends deadline 0 for them, Match.soloUntimed): ui/components.js Countdown now renders nothing without a deadline;
+   this rule stays as a safety net for the old "无倒计时" placeholder ("--" digits + COUNTDOWN label). */
 .countdown[aria-label="无倒计时"] { display: none; }
 
 /* the app screens behind the overlay do not need to animate */