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.

public/js/render/units.js

@@ -477,6 +477,8 @@ export class UnitView {
     this.sp = 0; this.spMax = 0;
     this.ammo = null;             // [rounds left, rounds in the magazine] while an ammo skill runs (sync; b.snap `ammo`)
     this.wolves = null;           // [狼影 left, the talent's maximum] of a 狼群 (sync; b.snap `wolves`)
+    this.coins = null;            // [balance, cap] of 琳琅诗怀雅's skill purse, including zero
+    this.coinHud = null;
     this.neg = 0;                 // the share of its cap a negative-HP pool holds, 0 = none (sync; b.snap `neg`, 斩业星熊's 我执)
     this.flags = 0; this.anim = ANIM.IDLE;
     this.statuses = new Set();
@@ -825,6 +827,7 @@ export class UnitView {
     this.hp = hp;
     this.sp = s.sp; this.spMax = s.spMax;
     this.ammo = s.ammo || null; this.wolves = s.wolves || null; this.neg = s.neg > 0 ? Math.min(1, s.neg) : 0;
+    this.coins = s.coins || null;
     const prevFlags = this.flags;
     this.flags = s.flags | 0;
     this.anim = s.anim | 0;
@@ -1412,7 +1415,8 @@ export class UnitView {
     // knocked-down operator (b.snap `down`)
     const rowsTop = cy + bh / 2 + (showSp ? spH + 1.5 : 0);
     const wolfH = this._updateWolfPips(showBars && !this.isEnemy && !!this.wolves, x0, rowsTop, s);
-    this._updateElementBar(showBars && !!this.el, x0, bw, rowsTop + wolfH + 1, spH, s, t);
+    const coinH = this._updateCoins(showBars && !this.isEnemy && !!this.coins, x0, rowsTop + wolfH, s);
+    this._updateElementBar(showBars && !!this.el, x0, bw, rowsTop + wolfH + coinH + 1, spH, s, t);
     this._updateDownRing(!prep && !!this.down && !this.alive, x, this.screen.y - DOWN_LOOK.height * s, s, t);
     // blocked marker at the feet (enemies held by a blocker)
     const blocked = !prep && this.alive && this.isEnemy && (this.flags & UF.BLOCKED);
@@ -1493,6 +1497,26 @@ export class UnitView {
     return d + 2 + WOLF_PIPS.pad;
   }
 
+  /** Coin icon and balance/cap, read from the current snapshot rather than transient FX. */
+  _updateCoins(show, x, top, s) {
+    let r = this.coinHud;
+    if (!show) { if (r) r.root.visible = false; return 0; }
+    if (!r) {
+      const P = this.P, root = new P.Container(), icon = new P.Sprite(fxAtlas().tex.coin);
+      icon.width = icon.height = 16;
+      const text = new P.Text('', { fontFamily: 'Bender, Oxanium, sans-serif', fontSize: 16, fontWeight: '700', fill: '#ffd04a', stroke: '#0b0f0e', strokeThickness: 3 });
+      text.position.set(19, -2); root.addChild(icon, text); this.hud.addChild(root);
+      r = this.coinHud = { root, text, label: '' };
+    }
+    const label = `${this.coins[0]}/${this.coins[1]}`;
+    if (r.label !== label) { r.label = label; r.text.text = label; }
+    const size = clamp(s * 0.2, 10, 16);
+    r.root.scale.set(size / 16); r.root.position.set(x, top + 3); r.root.visible = true;
+    // Text includes font metrics and stroke beyond its nominal 16 px size; reserve the measured row so the next
+    // elemental gauge cannot overlap it (especially with a substituted browser font).
+    return Math.max(16, r.root.getLocalBounds?.().height || 24) * (size / 16) + 8;
+  }
+
   /** True while the shown gauge is in its 爆发冷却 (b.snap `elem` carries the cooldown's end and length). */
   elementCooling() {
     return !!this.el && this.elDur > 0 && this.elUntil > 0;