Prevent duplicate workshop-page view transitions during hash navigation

[Copilot]

Hash-based navigation could open nested <details> before switching the active workshop page, briefly creating an invalid transition state with duplicate view-transition-name: workshop-page. This triggered aborted View Transitions and console errors across workshop pages.

• Runtime navigation ordering

  • Reordered hash-navigation flow in scripts/lib/page-template.js so page switching (showWorkshopPage) happens before expanding nested details (openDetailsAncestors) for non-page anchors.
  • Applied the same ordering to both hashchange handling and in-page hash-link click handling.

• Regression coverage

  • Updated the focused docs runtime test in scripts/build-docs.test.js to assert the new call order in generated output for both navigation paths.

• Illustrative change

  // before: openDetailsAncestors(target); showWorkshopPage(...)
  showWorkshopPage(target, scrollPage && isPageTarget);
  if (!isPageTarget) {
    openDetailsAncestors(target);
  }

• Fixes [workshop-playwright-qa] __root__: 1 QA finding(s) — navigation #2385