Harden assessor fallback after Zillow photo failure

skills/web-automation/scripts/real-estate-photo-common.test.mjs

@@ -1,7 +1,11 @@
 import test from "node:test";
 import assert from "node:assert/strict";
 
-import { normalizeImageCandidates, runWithOperationTimeout } from "./real-estate-photo-common.js";
+import {
+  isPageClosedError,
+  normalizeImageCandidates,
+  runWithOperationTimeout,
+} from "./real-estate-photo-common.js";
 
 test("normalizeImageCandidates keeps distinct Zillow photo URLs and strips query strings", () => {
   const result = normalizeImageCandidates(
@@ -85,3 +89,15 @@ test("runWithOperationTimeout rejects stalled work and runs timeout cleanup", as
 
   assert.equal(cleanedUp, true);
 });
+
+test("isPageClosedError detects transient browser-session closure errors", () => {
+  assert.equal(
+    isPageClosedError(new Error("page.evaluate: Target page, context or browser has been closed")),
+    true
+  );
+  assert.equal(
+    isPageClosedError(new Error("Execution context was destroyed, most likely because of a navigation")),
+    true
+  );
+  assert.equal(isPageClosedError(new Error("No Zillow image URLs were found")), false);
+});