- New Costs tab with bar chart (All Models) and line chart (By Model)
- Toggle between 14d / 30d / 90d time ranges, filtered client-side
- Bar chart shows cost value on top of each bar
- Line chart uses straight lines with always-visible data points
- Summary cards: total 30d cost, avg/day, top model, trend vs prior period
- Backend: getCostTimeSeries() query grouped by day x model x provider
- All cost values displayed as whole dollar amounts (Math.round)
Christoph Gross
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