Multiple tabs/accounts/auto-refresh funneled straight to Anthropic and tripped 429. Add a 120s TTL cache keyed by access token with in-flight promise dedup, serve the last good read on soft failure, and thread a force flag through getUsageForProvider for manual refresh. Also lower the dashboard poll cadence (180s to 600s) and stable group-by-provider so connection order stops jumping.
Co-Authored-By: Claude <noreply@anthropic.com>