The Brand.vue autofill was hitting the endpoint with a raw fetch()
call including manual CSRF header wiring, content-type boilerplate,
and error parsing. Inertia v3 ships useHttp() for standalone HTTP
requests that handles all of that natively — matching the convention
already used elsewhere in the app (YouTubeAnalytics, XAnalytics,
InstagramAnalytics).
Typed the payload and response shape so the composable gives us
type-safe access to the fields we care about. Error handling now
reads from the Inertia exception's response.data.message.
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