Show exact model pricing on hover (Tooltip)

Currently, the $ to $$$ badges are too broad. Models with very different costs often share the same $$ rating, making it hard to choose the most cost-effective one.

It would be awesome if we could just hover over the dollar signs to see a tooltip with the exact API cost (e.g., Input: $1.25 / 1M | Output: $2.50 / 1M). This solves the granularity issue without cluttering the current clean UI.