Playtest #6 fixes: summons placed by hand, boss pool stall, bounties, 联防 leak counter, distinct offers, 机变 card text, phone buy tap, skill triggers, blocking, push force, 孤立, enemies, element bar

- #1 #2 skill / device summons (赫默's drone, 巫恋's doll, 凯瑟琳's devices) are hand cards placed by the player;
  placed summons deploy once at battle start, then a skill summon re-appears at its tile on each cast (the user's call)
- #3 叙拉古 隐匿 ends on time (32 + 0.4 × layers s); 忍冬 S3 迷彩 lasts until her next cast (official), kept apart from 隐匿
- #4 multi-round bounty cards last two battles (the user's call; MULTI_ROUND_BOUNTY_BATTLES), blue / red card text
- #5 the shared boss pool's float dust (≈3.6e-12 HP) stalled Final Assault leaders at 0 %; < 1 HP now clears the pool,
  and the team LP reaching 0 first is a defeat (PRTS)
- #6 #10 机变 cards show their official effect text; an invisible 详情 button no longer swallows the confirming tap on phones
- #7 live ×N counter of a leaker's enemies still on the 联防 field (LP loss stays capped at 10)
- #8 #15 #16 skill triggers per 技能策略: skill-range triggers, injured-ally heals (古米, 塞雷娅), tank take-damage
  triggers with a 3 s cooldown; 新约能天使 S2 shields the highest-aggro operator in range
- #9 official per-enemy model scales (威龙)
- #11 element bar under the unit's HP bar (white = 元素值 left, element-coloured refill after a burst), floor rounding
- #12 枯朽战车 kit per PRTS; every ranged enemy reaches its target's 0.25 collider
- #13 恐惧 wander (萨科塔之翼 at half HP, operator fears make enemies flee) with re-planning after pushes
- #14 push / pull distance by 力度 − 重量 (PRTS table); #17 every blocker attacks what it blocks; ASPD floor 20
- #18 炎佑 is 孤立: no heals or ally buffs
- #19 every free pick-one chess offer (promotion reward, 信标, 寻呼模块) shows different operators
- DESIGN §20 and the normative lines, SIM / META / DATA / PLAYING updated; 2747 unit tests and all 27 browser suites
  green; dev recordings regenerated

public/js/render/app.js

@@ -869,7 +869,7 @@ export async function createFieldView(host, options = {}) {
         const moved = !prevHome || prevHome.x !== w.x || prevHome.y !== w.y || prevHome.z !== w.z;
         if (dragState && dragState.key === key) {
           dragState.home = w;                       // being dragged: only its home slot changes
-        } else if (pending.has(key) && !moved) {
+        } else if (pending.has(key) && !moved && !splitLanded(e, pending.get(key).board, list)) {
           // dropped, but this state predates the server applying the move: stay at the drop target
         } else {
           pending.delete(key);
@@ -892,6 +892,15 @@ export async function createFieldView(host, options = {}) {
     return true;
   }
 
+  /**
+   * A summon stack of several copies (凯瑟琳's 2 devices, user playtest #6) dropped on a board tile stays in the hand
+   * and one copy — a new piece of the same token — lands there: the state already shows the move, the stack goes home.
+   */
+  function splitLanded(e, tile, list) {
+    if (!tile || !e || e.piece?.kind !== 'token' || e.area === 'board') return false;
+    return list.some((x) => x.area === 'board' && x.uid !== e.uid && x.piece?.kind === 'token' && x.piece.id === e.piece.id && x.row === tile.row && x.col === tile.col);
+  }
+
   function adaptCanPlace(fn) {
     if (fn.length >= 3) return (piece, row, col, target) => !!fn(piece, row, col, target);
     return (piece, row, col, target) => !!fn(piece.uid, target, piece);
@@ -1111,7 +1120,7 @@ export async function createFieldView(host, options = {}) {
       const row = t.area === 'board' ? t.row : GEO.HAND_ROW, col = t.area === 'board' ? t.col : t.idx;
       const w = boardWorld(row, col, t.area === 'hand');
       v._tween = { fx: v.x, fy: v.y, fz: v.z, tx: w.x, ty: w.y, tz: w.z, t: 0 };
-      pending.set(dragState.key, { t: performance.now(), view: v });
+      pending.set(dragState.key, { t: performance.now(), view: v, board: t.area === 'board' ? { row, col } : null });
     } else {
       const h = dragState.home;
       v._tween = { fx: v.x, fy: v.y, fz: v.z, tx: h.x, ty: h.y, tz: h.z, t: 0 };