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gsxdsm f41732d04b FN-6652: add live token usage timeline

Adds live token-over-time analytics and charting to Command Center.

- Add optional token analytics time-series buckets with hour, day, and week granularity.
- Surface live-polled token series data through the Command Center tokens API.
- Render an animated, reduced-motion-safe tokens-over-time chart with granularity controls.
- Cover analytics bucketing, API query parsing, and Command Center chart behavior with tests.

Files changed:
 .changeset/fn-6652-token-usage-over-time.md        |   5 +
 docs/dashboard-guide.md                            |   4 +-
 .../core/src/__tests__/token-analytics.test.ts     |  76 ++++++++++++
 packages/core/src/index.ts                         |   2 +
 packages/core/src/token-analytics.ts               |  65 ++++++++++-
 .../components/command-center/CommandCenter.css    |  24 +++-
 .../components/command-center/CommandCenter.tsx    |  12 +-
 .../__tests__/CommandCenter.test.tsx               |  39 ++++++-
 .../command-center/__tests__/charts.test.tsx       |  44 +++++++
 .../components/command-center/areas/TokensArea.tsx |  46 +++++++-
 .../command-center/areas/__tests__/areas.test.tsx  | 128 ++++++++++++++++++++-
 .../app/components/command-center/areas/areas.css  |  57 +++++++++
 .../command-center/areas/useAnalyticsArea.ts       |  26 ++++-
 .../command-center/charts/TokenSeriesChart.tsx     |  52 +++++++++
 .../components/command-center/charts/charts.css    |  76 ++++++++++++
 .../register-command-center-routes.test.ts         |  38 +++++-
 .../src/routes/register-command-center-routes.ts   |  15 +++
 17 files changed, 691 insertions(+), 18 deletions(-)

Fusion-Task-Id: FN-6652

Fusion-Task-Lineage: ebfd1b5d-5b6c-48ef-bce3-f18bbc1605fa

2026-06-18 15:27:57 -07:00