Fix Page Scanner URL host resolution for traditional pages in UVE

[Copilot]

Proposed Changes

Traditional pages were sending scanner URLs as admin-origin + path, which made same-path pages across different hosts indistinguishable and produced reports for the wrong page. This update makes scanner URL construction host-aware for traditional pages while preserving headless behavior.

• Host resolution logic
  • Updated getRequestHostName to resolve in this order:
    1. params.clientHost (headless, unchanged)
    2. page site.hostname (traditional pages)
    3. window.location.origin fallback
• Scanner entrypoint wiring
  • Updated DotEmaShellComponent $seoParams to pass pageAsset.site.hostname into host resolution so both Geo and A11y scanner flows receive the correct page host.
• Focused coverage
  • Added/updated unit tests for:
    • clientHost precedence
    • hostname-only and full-URL hostname handling
    • fallback behavior
    • $seoParams.requestHostName on traditional pages (no clientHost)

const requestHostName = getRequestHostName(
  this.uveStore.pageParams(),
  this.uveStore.pageAsset()?.site?.hostname
);
const pageUrl = `${requestHostName}${currentUrl ?? '/'}`;

Checklist

• Tests
• Translations
• Security Implications Contemplated (add notes if applicable)

Additional Info

Security/trust boundaries are unchanged: backend proxy behavior is the same; this PR corrects frontend URL selection so scanner requests target the actual edited page host for traditional pages.

Screenshots

Original	Updated
N/A (network payload behavior change)	N/A (network payload behavior change)

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:

• opencollective.com
  • Triggering command: /opt/hostedtoolcache/node/24.14.1/x64/bin/node /opt/hostedtoolcache/node/24.14.1/x64/bin/node /home/REDACTED/work/core/core/core-web/node_modules/document-register-element/node_modules/.bin/lightercollective /home/REDACTED/work/core/core/core-web/libs/portlets/edit-ema/portlet/src/lib/utils/utils.spec.ts (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)