fix(03-04): on-screen diagnostic probe — WA version/platform, initData char-count, session + location categories

web/src/main.ts

@@ -28,6 +28,7 @@ import { createPositionMarker } from "./map/marker.ts";
 import { createFollowController } from "./map/follow.ts";
 import { createStatusStrip } from "./ui/strip.ts";
 import { buildBootCard, buildDeniedCard, buildSignalLostCard, startGantry, stopGantry } from "./ui/cards.ts";
+import { createProbe } from "./ui/probe.ts";
 import { createRecenterControl } from "./ui/recenter.ts";
 import { getWebApp } from "./telegram/webapp.ts";
 import { watchTheme } from "./telegram/theme.ts";
@@ -97,6 +98,11 @@ async function boot(): Promise<void> {
     if (lastFix !== null && map !== null) follow?.follow(lastFix);
   });
 
+  // DEBUG-ROUND probe: category-only on-screen telemetry for the device
+  // matrix (webview has no dev-tools); removed at the exit.
+  const probe = createProbe(mainEl);
+  probe.set({ wa: wa ? `${wa.version ?? "?"}/${wa.platform ?? "?"}` : "none", initDataChars: wa ? wa.initData.length : null });
+
   // Cards are built once at boot (boot-time locale) and reused across re-runs.
   const bootCard1 = buildBootCard(locale, 1);
   const bootCard2 = buildBootCard(locale, 2);
@@ -182,6 +188,7 @@ async function boot(): Promise<void> {
   }
 
   function renderState(state: LocationState): void {
+    probe.set({ location: state.kind });
     const ageSec = lastFix !== null ? fixAgeSeconds(lastFix, Date.now()) : null;
     const accuracyM = lastFix !== null ? lastFix.accuracyM : null;
     strip.render(state, ageSec, accuracyM);
@@ -233,6 +240,7 @@ async function boot(): Promise<void> {
   async function runFromSession(): Promise<void> {
     renderState({ kind: "validating" });
     const session = await createSession(wa?.initData ?? "");
+    probe.set({ session: session.ok ? "ok" : session.reason, initDataChars: wa ? wa.initData.length : null });
     if (!session.ok) {
       staleHandled = false; // session-first failure is boot-level, not a stale-fix recovery
       renderDenied();