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)

test/match/combat.test.js

@@ -175,13 +175,13 @@ test('联防: an operator dead at the end of the helper\'s own combat stays out
   const m = h.m;
   h.toPrep(1);
   const helper = h.ps('p_1');
-  // 赫默 (placeable summon) is knocked out in p_1's own combat; a second operator survives it
-  const t0 = legalTileFor(m, helper, 'chess_char_2_02_a');
-  const hemo = give(m, helper, 'chess_char_2_02_a', 'board', t0);
+  // 伺夜 (placeable talent summon 狼群) is knocked out in p_1's own combat; a second operator survives it
+  const t0 = legalTileFor(m, helper, 'chess_char_3_19_a');
+  const hemo = give(m, helper, 'chess_char_3_19_a', 'board', t0);
   const other = chessOfTier(1, (c) => c.position === 'RANGED').find((x) => m.pool.has(x));
   const alive = give(m, helper, other, 'board', legalTileFor(m, helper, other));
   const stack = helper.hand.find((p) => p && p.kind === 'token' && p.ownerUid === hemo.uid);
-  assert.ok(stack, '赫默 brought its summon stack');
+  assert.ok(stack, '伺夜 brought its summon stack');
   let placed = null;
   for (const [k] of helper.deployMap()) {
     const [r, c] = k.split(',').map(Number);