- add byAgentModel endpoint and expandable per-agent model sub-rows in the spend tab
- validate date range inputs with isNaN + badRequest to return HTTP 400 on bad input
- move CostByProject from a local api/costs.ts definition into packages/shared types
- gate providerData query on mainTab === providers, consistent with weekData/windowData/quotaData
- fix byProject range filter from finishedAt to startedAt, consistent with byProvider runs query
- fix WHAM used_percent threshold from <= 1 to < 1 to avoid misclassifying 1% usage as 100%
- replace inline opacity style with tailwind bg-primary/85 class in ProviderQuotaCard
- reset expandedAgents set when company or date range changes
- sort agent model sub-rows by cost descending in ui memo
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