修复：部署无法到达已打开的页面（新增构建版本标记 + 陈旧页面自动重载） (#39)

public/js/main.js

@@ -45,6 +45,7 @@ import { GuideHost } from './ui/guide.js';
 import { installDeviceSupport } from './ui/device.js';
 import { LoadoutHost } from './screens/loadout.js';
 import { installLoadoutSync } from './ui/loadoutSync.js';
+import { startBuildGuard } from './ui/buildGuard.js';
 
 const RESTORE_GRACE_MS = 1500;
 const JOIN_DELAY_MS = 350;
@@ -351,6 +352,18 @@ async function boot() {
     setTimeout(() => splash.remove(), 300);
   }
   globalThis.__SP__ = { store, net, data, version: 1 };
+  // A page keeps the modules it imported at load time for its whole lifetime, so a deploy cannot reach an open tab
+  // (ui/buildGuard.js): watch `/healthz.build`. Outside a match the page reloads itself; during a match the guard says
+  // so instead (the connection banner offers 刷新页面) and reloads once the match — settlement screen included — is over,
+  // so a running game is never thrown away.
+  try {
+    startBuildGuard({
+      inMatch: () => selectRoute(store.get()) === 'game',
+      onStale: ({ waiting }) => { if (waiting) store.patch('ui', { buildStale: true }); },
+    });
+  } catch (err) {
+    console.warn('[app] build guard failed to start', err);
+  }
 }
 
 boot().catch((err) => {