fix(login): do not block login completion on EA2 scenario fetch

If buildLiveScenariosFromApi hangs or errors on any EA2 read,
loginAs would await it forever, leaving the user stuck on
'VERIFYING...' even after auth+identity succeed. Make refreshLive
fire-and-forget after the toast; the Mission scene re-fetches
on mount and surfaces failures via liveError.

qa/_probe_dom.mjs

@@ -0,0 +1,46 @@
+import { chromium } from "playwright";
+
+const b = await chromium.launch({ headless: true });
+const ctx = await b.newContext({ viewport: { width: 1440, height: 900 } });
+const p = await ctx.newPage();
+const calls = [];
+p.on("response", async (r) => {
+  const u = r.url();
+  if (u.includes("/api/")) {
+    calls.push({ status: r.status(), method: r.request().method(), url: u.replace("https://canvas.flow-master.ai", "") });
+  }
+});
+p.on("console", (m) => { if (m.type() === "error") console.log("CONSOLE-ERR:", m.text().slice(0, 200)); });
+p.on("pageerror", (e) => console.log("PAGE-ERR:", e.message.slice(0, 200)));
+await ctx.addInitScript(() => localStorage.setItem("fm.canvas.tour.seen", String(Date.now())));
+
+await p.goto("https://canvas.flow-master.ai/", { waitUntil: "domcontentloaded" });
+await p.waitForTimeout(2500);
+await p.locator(".persona-chip").filter({ hasText: /Mariana/ }).click();
+// Live auth can take 6-10s; wait for shell to flip
+await p.waitForFunction(() => !document.querySelector("[class*='shell-login']"), null, { timeout: 30000 }).catch(() => {});
+await p.waitForTimeout(3000);
+
+const state = await p.evaluate(() => {
+  const shell = document.querySelector("[class*='shell-']")?.className;
+  const topbar = document.querySelector("header.topbar");
+  const tabs = Array.from(document.querySelectorAll(".tab")).map(t => t.textContent?.trim());
+  const headerByTag = document.querySelector("header")?.outerHTML?.slice(0, 200);
+  return {
+    shell,
+    hasTopbar: !!topbar,
+    headerByTag,
+    tabCount: tabs.length,
+    tabs,
+    sceneText: document.querySelector(".scene")?.innerText?.slice(0, 300) || null,
+  };
+});
+console.log(JSON.stringify(state, null, 2));
+
+await p.screenshot({ path: "/tmp/canvas-evidence/measure.png", fullPage: false });
+console.log("screenshot /tmp/canvas-evidence/measure.png");
+
+console.log("\n=== api calls ===");
+for (const c of calls) console.log(`  ${c.status} ${c.method} ${c.url.slice(0, 100)}`);
+
+await b.close();