- AccountsView: display email under account name by checking extra.email
and credentials.email in addition to extra.email_address; OpenAI OAuth
stores email under the 'email' key while Anthropic uses 'email_address'
- AccountUsageCell: add per-account refresh button to the OpenAI OAuth
usage section, identical to the existing Anthropic OAuth pattern;
reuses loadActiveUsage, activeQueryLoading, and the activeQuery i18n key