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/voicePrefs.js

@@ -0,0 +1,14 @@
+// Browser-local dub preferences. Every variant of an operator shares its charId; absent entries follow the global dub.
+export const VOICE_LANGS = Object.freeze(['cn', 'jp']);
+export function sanitizeVoiceOverrides(raw) {
+  const out = {};
+  if (!raw || typeof raw !== 'object' || Array.isArray(raw)) return out;
+  for (const [id, lang] of Object.entries(raw).slice(0, 512)) {
+    if (/^char_[0-9]+_[a-z0-9]+$/.test(id) && id.length <= 80 && VOICE_LANGS.includes(lang)) out[id] = lang;
+  }
+  return out;
+}
+export function voiceLangFor(charId, globalLang, overrides) {
+  const own = Object.hasOwn(overrides || {}, charId) ? overrides[charId] : null;
+  return VOICE_LANGS.includes(own) ? own : globalLang === 'jp' ? 'jp' : 'cn';
+}