fix: h1 visibility test by waiting for network idle

[Copilot]

Proposed changes

The patternhub overview tests fail intermittently because h1 elements are checked before React finishes hydrating. The DefaultPage component uses dynamic imports with SSR disabled, so content only renders after client-side JavaScript executes.

Changes:

• Changed waitUntil from 'domcontentloaded' to 'networkidle' in test helper to ensure JavaScript execution completes before asserting element visibility
• Fixed misleading variable name firstH2 → firstH1 (was already querying h1 elements)

// Before: DOM loaded, but React may not have hydrated
await page.goto(`${path}`, { waitUntil: 'domcontentloaded' });

// After: All network requests complete, React hydrated
await page.goto(`${path}`, { waitUntil: 'networkidle' });

resolves https://github.com/db-ux-design-system/core-team/issues/1512

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Further comments

The networkidle strategy waits until no network connections exist for ≥500ms, ensuring dynamic imports and React hydration complete before tests run. This eliminates the race condition without adding artificial delays.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• www-api.ibm.com
  • Triggering command: /opt/hostedtoolcache/node/24.11.1/x64/bin/node node /home/REDACTED/work/core-web/core-web/node_modules/@ibm/telemetry-js/dist/REDACTED-process.js --log=/tmp/ibmtelemetry-20251203T165307876Z-840652.log --config=telemetry.yml (dns block)
  • Triggering command: /opt/hostedtoolcache/node/24.11.1/x64/bin/node node /home/REDACTED/work/core-web/core-web/node_modules/@ibm/telemetry-js/dist/REDACTED-process.js --log=/tmp/ibmtelemetry-20251203T165628811Z-612582.log --config=telemetry.yml (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Pipeline fix für Step regenerate-snapshots-patternhub</issue_title>
<issue_description>### Beschreibung

Der Test schlägt fehl, weil h1 Elemente auf einigen oder allen overview Seiten nicht konsistent sichtbar sind.
Die Ursache der inkonsistenten h1-Sichtbarkeit auf den overview-Seiten der Breadcrumb-Komponente muss ermittelt und behoben werden.

Der auskommentierte Test-Code-Block muss wieder aktiviert oder angepasst werden.

Datei: showcases/patternhub/tests/default.spec.ts

Akzeptanzkriterien:

• Test aktiviert: Der provisorisch auskommentierte Test-Block in showcases/patternhub/tests/default.spec.ts (Zeilen 32-42 im Diff) wird wieder aktiviert und muss erfolgreich durchlaufen (grün sein).
• Code-Bereinigung: Der erklärende Kommentar (// COMMENTED OUT: This test fails because h1 elements are not consistently visible on all pages) sowie der auskommentierte Code selbst werden aus der Datei entfernt, sobald der Test wieder aktiv ist.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes db-ux-design-system/core-team#1512

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/copilot/fix-h1-visibility-test

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7a11be2

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[Copilot]

Pull request overview

This PR fixes intermittent test failures in the patternhub overview tests where h1 elements were being checked before React completed hydration. The fix changes the Playwright wait strategy and corrects a misleading variable name.

• Changed waitUntil from 'domcontentloaded' to 'networkidle' to ensure JavaScript execution and React hydration complete before assertions
• Fixed misleading variable name firstH2 → firstH1 (was already querying h1 elements)