0.2.6-dev: traffic counters — HTTP body bytes by category (assets / audio / code / data) and WebSocket wire / payload bytes since the start at GET /healthz?traffic=1, and the page's own downloads (Resource Timing transferSize) as a traffic line in the 问题反馈 diagnostics (host bandwidth layer 0.4); golden: unchanged

public/js/main.js

@@ -55,7 +55,7 @@ import { installLoadoutSync, installOwnershipSync, installDiySync } from './ui/l
 import { startBuildGuard } from './ui/buildGuard.js';
 import { initLang, useLang, tickerText } from './ui/lang.js';
 import { t, N_, translateWire } from '../../shared/i18n.js';
-import { recordError } from './diag.js';
+import { recordError, installTrafficMeter } from './diag.js';
 
 const RESTORE_GRACE_MS = 1500;
 const JOIN_DELAY_MS = 350;
@@ -346,6 +346,8 @@ function installGlobalErrorHandlers() {
 
 async function boot() {
   installGlobalErrorHandlers();
+  // what this page downloads, by category, for the 问题反馈 report's traffic line (diag.js; nothing is sent anywhere)
+  installTrafficMeter();
   // touch / hover / fullscreen classes, zoom-gesture blocking, rotation re-layout (ui/device.js, css/devices.css)
   installDeviceSupport();
   // A page restored from the back/forward cache has a dead socket and a stale token choice: start over.