Update account

Updates a connected social account's display name or username override.

For X/Twitter accounts on usage-based billing, also accepts an xCapabilities object to toggle background API operations that incur X API pass-through costs. Both fields are opt-in (default false) — when off, no analytics syncs or DM polling are performed for that account, and no API call is metered for those operations. Publishing and deleting posts are always available regardless of these toggles. Setting xCapabilities on a non-X account returns 400.