Update chart/graph colors and fonts to match brand palette

- Remap all hardcoded D3 chart colors from indigo/bright to brand teal/muted palette
- Update background, border, and text colors in JS to match CSS variables
- Replace Inter font references with Public Sans in SVG text elements
- Add clipPath to homepage treemap to prevent text overflow
- Set --text to #FFFFFF, --radius to 0px to match supermodel.com
- Align font fallback stacks with supermodel.com

Author: jonathanpopham