fix: Update Chrome Web Store crawler selector for user count

Google changed the CWS detail page DOM layout — a new "Add to Chrome"
div was appended as the last child of the header section, causing the
`div:last-child` selector to miss the user count element. The crawler
threw on `weeklyActiveUsers` extraction, which nullified the entire
extension entry in the GraphQL response.

Replace the positional `div:last-child` selector with a text-content
search for the div containing " users", making it resilient to future
DOM reordering. Add a test fixture from the current (Apr 2026) CWS HTML.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: shadoath

src/services/__tests__/fixtures/chrome-web-store/2026-04-17-hmdcmlfkchdmnmnmheododdhjedfccka.html

@@ -62,9 +62,17 @@ export async function crawlExtension(
 
   const weeklyActiveUsersText = tryExtract("weeklyActiveUsers", validateInt, [
     () => {
-      const userCountRow = document.querySelector(
-        "main > * > section:first-child > section > div > div:last-child",
-      ) as HTMLElement | null;
+      // Find the header div whose text contains " users" (resilient to DOM reordering)
+      const headerDivs = document.querySelectorAll(
+        "main > * > section:first-child > section > div > div",
+      );
+      let userCountRow: HTMLElement | null = null;
+      for (const div of headerDivs) {
+        if ((div as HTMLElement).textContent?.includes(" users")) {
+          userCountRow = div as HTMLElement;
+          break;
+        }
+      }
       removeAnchorChildren(userCountRow);
       return (
         userCountRow?.textContent