Declare meta on all 18 mutation hooks: meta.successMessage (toast.* key)
on every discrete user action, meta.suppressErrorToast where the consuming
component already renders the error inline. Corrected useUpdateFieldDefinition
to suppress (FieldForm renders update.isError as form.rejected inline).
Add an RTL+MSW integration test wiring the real MutationCache via
makeQueryClient() + ToastRegion: success toast, catch-all error toast, and
suppressed-no-toast. Tidy the toast Close aria-label to t("common.close")
with en/sv parity.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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