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/ui/fallbackField.js

@@ -332,6 +332,16 @@ export function createFallbackView(host, opts = {}) {
     const now = performance.now();
     if (st.mode === 'prep' && st.priv) {
       const heldPos = (p) => { const t = st.held.get(p.uid); return t ? tilePos(L, t.row, t.col) : null; };
+      for (const u of Array.isArray(st.priv.prepMapChars) ? st.priv.prepMapChars : []) {
+        if (!u || !Number.isInteger(u.x) || !Number.isInteger(u.y) || typeof u.defId !== 'string') continue;
+        const pos = tilePos(L, u.y, u.x);
+        const src = tokenAvatarUrl(m(), u.defId);
+        pieces.push(html`<div key=${`map:${u.uid}`} class="ff-piece ff-piece--token ff-piece--map-char"
+            style=${`transform:translate(${pos.x}px,${pos.y}px);width:${L.tile}px;height:${L.tile}px;pointer-events:none`}
+            title=${u.name || u.defId}>
+          <div class="ff-piece__art">${src ? html`<img src=${src} alt="" draggable=${false} />` : html`<span>${[...(u.name || '?')][0]}</span>`}</div>
+        </div>`);
+      }
       for (const p of Array.isArray(st.priv.board) ? st.priv.board : []) {
         if (!p || !Number.isInteger(p.row)) continue;
         const pos = heldPos(p) || tilePos(L, p.row, p.col);