0.2.3: prepare follow-up fixes and client features (#407, #408, #410, #413, #431, #435, #436, #440, #444)

Add special-target activation without bypassing attack cadence, cooperative
card preferences and emotes, skill sound banks, per-operator voice choices,
text sizing, install prompts, closed-tab recovery and unanimous setup rerolls.
Retain late deployment elapsed time and resolve echo/counter pulses without
recursive hook overflow. Independent final review remains pending.

Golden: roster-016, roster-035, roster-036, roster-045;
boss-boss_1-pair, boss-boss_3-pair, boss-boss_5-pair, boss-boss_7-pair,
hidden-boss_9-pair; solo-HARD-9-boosted: Lemuen attack cadence.
diy-132: Necras extra activation targets.
coop2-NORMAL-14-standins: cooperative purchase preference and simulation fixes.
hidden-boss_10-solo: echo pulse FIFO resolution.
See DESIGN 28.13-28.24 for assumptions, sources and contributor credit.

public/js/assets.js

@@ -226,7 +226,11 @@ export function bgmEntry(m, kind) {
 /** SFX URL: group 'ui' | 'battle', key e.g. 'buy'. */
 export const sfxUrl = (m, group, key) => str(get(get(get(get(m, 'audio'), 'sfx'), str(group) || ''), str(key) || ''));
 
-/** Per-unit SFX: kind 'attack' | 'hit' | 'skill' | 'die' | 'born'; `skillIndex` picks `skills[i]` when present. */
+/**
+ * Per-unit SFX: kind 'attack' | 'hit' | 'skill' | 'die' | 'born'; `skillIndex` picks `skills[i]` and — for an attack or
+ * an impact — `attacks[i]` / `hits[i]` (the running skill's own files, tools/assets/audio.mjs pickModeAttacks /
+ * pickModeHits) when the manifest has them.
+ */
 export function unitSfxUrl(m, id, kind, skillIndex) {
   const u = get(get(get(get(m, 'audio'), 'sfx'), 'units'), str(id) || '') || get(get(get(get(m, 'audio'), 'sfx'), 'units'), baseCharId(id) || '');
   if (!isObj(u)) return null;
@@ -234,6 +238,11 @@ export function unitSfxUrl(m, id, kind, skillIndex) {
     const s = str(u.skills[skillIndex]);
     if (s) return s;
   }
+  const per = kind === 'attack' ? u.attacks : kind === 'hit' ? u.hits : null;
+  if (Number.isInteger(skillIndex) && isObj(per)) {
+    const a = str(per[skillIndex]);
+    if (a) return a;
+  }
   return str(u[kind]);
 }