[Bug]: broken logo on default frontend page (pimcoreadmin → pimcorestudioui)

[elements-team]

Expected behavior

<!-- before -->
<img src="/bundles/pimcoreadmin/img/logo-claim-gray.svg" ... />
<!-- after -->
<img src="/bundles/pimcorestudioui/img/logo-purple.svg" ... />

### Actual behavior

Template references `/bundles/pimcoreadmin/img/logo-claim-gray.svg`.
`PimcoreAdminBundle` (classic Admin UI) is no longer installed in Pimcore 2026.1 — replaced by Studio UI.
`public/bundles/pimcoreadmin/` does not exist → 404.

**File:** `templates/default/default.html.twig:105`

### Steps to reproduce

Install a fresh 2026.1 project and open the default frontend page

[markus-moser]

https://github.com/pimcore/studio-ui-bundle/tree/2026.x/public/img
https://github.com/pimcore/skeleton/blob/2026.x/templates/default/default.html.twig#L105

[jdreesen]

@markus-moser shouldn't the alt tag (alt="Logo claim grey") also be updated?

[markus-moser]

@jdreesen you are right, will add it

[markus-moser]

@jdreesen thanks for the hint and checking the PRs