Prediction Market to Sports Odds Converter

About

Chrome extension that appends sportsbook-style odds next to prediction market prices on Polymarket and Kalshi. Shows Decimal, American, and Fractional. Optional fee adjustment (in percentage points) to model effective probability before conversion.

- Finds text like `55%` or `$0.55` and computes:
  - Decimal: 1 / p
  - American: if p >= 0.5 → -(p/(1-p))*100, else ((1-p)/p)*100
  - Fractional: (1 - p) / p as a simplified fraction (approx.)
- Works on SPA updates using a `MutationObserver`.
- Avoids duplicate badges via a data-attribute.