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/ui/operatorVoice.js

@@ -0,0 +1,25 @@
+// Local listening preference, shared by roster and DIY details; deliberately absent from room.loadout.
+import { html } from './components.js';
+import { useSettings, updateSettings } from './settings.js';
+import { t } from '../../../shared/i18n.js';
+
+const VOICE_LANG_NAMES = { cn: '中文', jp: '日本語' }; // i18n-ignore
+
+export function OperatorVoice({ charId }) {
+  const settings = useSettings();
+  if (!charId) return null;
+  const value = settings.voiceOverrides[charId] || '';
+  const change = (lang) => {
+    const voiceOverrides = { ...settings.voiceOverrides };
+    if (lang) voiceOverrides[charId] = lang;
+    else delete voiceOverrides[charId];
+    updateSettings({ voiceOverrides });
+  };
+  return html`<label class="lo-voice" data-voice-char=${charId}>
+    <span>${t('此干员语音')}</span>
+    <span class="lo-select"><select aria-label=${t('此干员语音')} value=${value} onChange=${(e) => change(e.currentTarget.value)}>
+      <option value="">${t('跟随全局')}</option><option value="cn">${VOICE_LANG_NAMES.cn}</option><option value="jp">${VOICE_LANG_NAMES.jp}</option>
+    </select></span>
+    <small>${t('仅保存在此浏览器，缺失的日语语音会回退到中文。')}</small>
+  </label>`;
+}