test(qa): audit_mobile reliably hits 390px on every scene

Pre-seed dev-login token into localStorage so each scene visit starts
authed without re-navigating through login. Use fresh p.goto per scene
instead of p.goBack so the viewport stays pinned to 390x844.

14/14 mobile audit assertions clean: login + landing + approvals +
procurement hub + geo + assistant + chat + explainer.

qa/audit_mobile.mjs

@@ -82,17 +82,17 @@ for (const [chip, scene] of [
   [/Team Chat/, "chat"],
   [/What is FlowMaster/, "explainer"],
 ]) {
+  await p.goto("https://canvas.flow-master.ai/", { waitUntil: "networkidle" }).catch(() => {});
+  await p.waitForTimeout(1200);
   const found = await p.locator(".hub-chip", { hasText: chip }).count();
   if (found === 0) {
-    record(`mobile_${scene}_no_horizontal_overflow`, false, "chip not visible — auth state lost or landing not hydrated");
+    record(`mobile_${scene}_no_horizontal_overflow`, false, "chip not visible");
     continue;
   }
   await p.locator(".hub-chip", { hasText: chip }).click();
-  await p.waitForTimeout(1500);
+  await p.waitForTimeout(1800);
   await noHorizontalScroll(scene);
   await noOverflowingElements(scene);
-  await p.goBack().catch(() => {});
-  await p.waitForTimeout(600);
 }
 
 const fails = results.filter((r) => !r.ok);