0.2.4-dev: round-29 community fixes and the official shared card pool

- Shared card pool and item stock as in the official mode (the owner's request, from the 路标档案馆 video and public notes): solo low-tier exceptions, co-op operators x2, shared item stock with special-item exceptions, normal / advanced occupancy 1 / 2, re-check on buy, 机变 exhaustion, release on consume / destroy / elimination; 整备 never exceeds stock; invariant held <= cap.
- 突袭: one taunt-first reselect right after a revive (the owner's rule); ordinary polls and redeploys keep the 0.2.3 rule; a revive on an enemy's tile stays. #475: online boss / hidden-boss Raid may land on the empty half (owner-limited scope).
- 浊心斯卡蒂 S1 x 坚守 no longer bounce redirected damage, and the two shares conserve the hit (idea of PR #464 by @HappyTanuki).
- Operator fixes adapted from PRs by @Xinglan233 (#459 哈洛德 S2 elemental trigger, #460 涤火杰西卡 shield on the four adjacent tiles, #461 家族徽章 first hit after stealth, #462 松果 S2 regrow per deploy); 克莱门莎 S2 splash 1.1 / 100% ATK and air auto-trigger (#467); 白面 copying 歌蕾蒂娅 / 余 skips the three-member condition (#473, the owner's video).
- 香槟炸弹 is not chosen by friendly auras / heals (PR #468 / #476 by @Siornya); 琳琅诗怀雅 coin balance (PR #450 by @IceCodeNew); Touch prep display (PR #451 by @YinqiMargatroid); lobby header (PR #471 by @YuriRestia); Japanese UI terms (PR #448 by @scutkane).
- AI-only boss countdown grace, render-failure cache / recovery without restarting a battle, device units kept on a same-field re-entry, DIY detail / skill previews, large-text result buttons.
- golden: battle families equal 0.2.3 except diy-135 / diy-136 (克莱门莎); all 18 release matches move through the shared pool, every flip named in docs/history/0.2.4.md §29.12; two coverage scenarios added.

server/sim/snapshot.js

@@ -142,6 +142,13 @@ export function ammoView(u) {
   return [left, Math.max(1, Math.ceil((sk.ammoMax || sk.ammo || 0) - 1e-9), left)];
 }
 
+/** 琳琅诗怀雅's skill purse: zero is a balance; no purse is null. Display only. */
+export function coinView(u) {
+  const n = u.mem?.coins, max = u.skill?.bb?.sp;
+  if (u.side !== 'ally' || !Number.isSafeInteger(n) || n < 0 || !Number.isSafeInteger(max) || max < 1) return null;
+  return [Math.min(n, max), max];
+}
+
 /**
  * `wolfView(u)` = `[狼影 left, the talent's maximum]` of 伺夜's 狼群 pack (content/tokens.js wolfPack and the managed kit
  * chess_char_3_19-vigil.js keep the count in `mem.shadows` and the maximum in `mem.wolfCapacity`): the pips under the HP