Groups have real usedDiskQuota/quotas fields, same as Users, but the
Groups list schema doesn't expose usage as a column any more than the
Accounts list did — extend the existing account-quota-usage-column
deviation to x:Account/Group too (SCHEMA_DEVIATIONS.md updated).
The isAccountsList gate that resolved/rendered quotaUsage was hardcoded
to viewName === 'x:Account/User', so it silently no-oped for Groups.
Replaced with hasQuotaUsageColumn, derived from whether the resolved
list's own columns include the synthetic quotaUsage column — works for
any list withAccountListColumns patches, not just a hardcoded pair of
view names.
Also: "Unlimited" (no quota configured) now renders as "∞" instead of
the word, matching the size formatting style used elsewhere in the
column.