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/index.html

@@ -15,6 +15,7 @@
   <meta name="apple-mobile-web-app-title" content="卫戍协议" />
   <meta name="description" content="卫戍协议：盟约 · 网页联机复刻（非官方同人作品）" />
   <title>卫戍协议：盟约 · STRONGHOLD PROTOCOL</title>
+  <link rel="manifest" href="/manifest.json" />
   <link rel="icon" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Crect width='24' height='24' fill='%230c0f0e'/%3E%3Cpath fill='%234ed8af' d='M5 3h3v2h2V3h4v2h2V3h3v5l-2 2v7l2 2v2H5v-2l2-2v-7L5 8z'/%3E%3C/svg%3E" />
 
   <!-- Web fonts: never render-blocking (LAN/offline play must still start); system fallbacks in theme.css. -->
@@ -69,6 +70,7 @@
     <div class="rotate-hint__phone"></div>
     <div class="rotate-hint__title">请将设备横屏</div>
     <div>卫戍协议：盟约 需要横屏显示以获得完整体验</div>
+    <button type="button" hidden class="btn btn--secondary btn--sm rotate-hint__pwa" id="rotate-hint-pwa">添加到桌面</button>
     <div class="rotate-hint__micro">ROTATE DEVICE</div>
   </div>