Brand autofill on the workspace settings page already captured the site logo
and rendered a preview beneath the URL, but the update flow never persisted it.
The store flow attached it via LogoAttacher; the update flow was missing all
three legs: the form field, the request rule, and the controller attach.
- BrandTab: add logo_url to the useForm payload so autofill can set it and the
form submits it.
- UpdateWorkspaceRequest: validate logo_url (nullable url) — FormRequest strips
any unvalidated key, so without a rule it was silently dropped.
- WorkspaceController::updateSettings: pull logo_url out of the validated data
(it is not a column) and attach it through LogoAttacher, mirroring store.
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