apps/mobile/src/features/usage/UsageRouteScreen.tsx   |  81 +++++-
 apps/mobile/src/features/usage/usageProviders.ts      |  20 ++
 apps/server/src/usage/usageAggregation.test.ts        |  25 +-
 apps/server/src/usage/usageAggregation.ts             |  58 ++++-
 apps/server/src/usage/usagePricing.test.ts            |  46 +++-
 apps/server/src/usage/usagePricing.ts                 |  67 ++++-
 apps/web/src/components/usage/UsageModelDialog.tsx    | 166 +++++++++++++
 apps/web/src/components/usage/UsagePage.tsx           | 423 +++++++++++++++++++-------------
 apps/web/src/components/usage/UsagePriceOverrides.tsx |  14 +-
 apps/web/src/components/usage/UsageShareBar.tsx       |  73 ++++++
 apps/web/src/components/usage/usageBreakdown.test.ts  |  39 ++-
 apps/web/src/components/usage/usageBreakdown.ts       |  72 +++++-
 apps/web/src/state/usage.ts                           |  43 ++--
 docs/user/usage.md                                    |   8 +-
 packages/contracts/src/usage.ts                       |  25 +-
 packages/shared/src/usageMerge.test.ts                |  61 +++++
 packages/shared/src/usageMerge.ts                     |  81 ++++++
 17 files changed, 1097 insertions(+), 205 deletions(-)