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Surface the metering data (PAR-193 foundation) in the UI: AI token usage over time, seat usage vs limit, and per-team/per-workspace rollups for billing reporting (ties into the analytics product, PAR-192). Reads usage_event + tenant.seat_limit from the mirror; charts via recharts (already added). Pairs with Stripe billing for plan/overage display.
Verified LIVE.
usage/page.tsx(settings-gated) readsusage_event+tenant.seat_limit/planvialib/sql/usage.ts(tokens-by-day, tokens-by-model, seats-used, billing) and renders recharts (dependency present) area/bar charts incomponents/UsageCharts. Acceptance met.