Fixes:
- A model with no price read $0.00, the same as free usage. A row that shows a token count beside an amount now shows a dash when those tokens could not be priced. That happens when a model is not in the pricing data yet: Claude Opus 5.5 read $0.00 until LiteLLM and OpenRouter listed it on 2026-09-22. The Models tab, the model breakdown, Agents, the Daily and Monthly rows, the usage chart, the heatmap and the usage attribution rows all follow this. In the same places, a positive amount under half a cent now reads <$0.01 instead of $0.00. Totals shown without a token count beside them are unchanged, and they still count unpriced usage as nothing.
