Allow selection of color temp on cwww or rgbww light device via v3 web server

[davidcoulson]

Component name

web_server

Link to component documentation on our website

https://esphome.io/components/web_server/

Describe the enhancement

With 2026.7.4 when I have a rgbww or cwww light device I can select brightness or color (if rgb) via the ESPHome web interface, but not color temperature. There is also nothing that shows current color temp in whatever unit is appropriate (assuming K vs mireds for UX?)

Use cases

Would allow for testing/change of light settings via web interface without needing to use HA API to adjust color temp.

Anything else?

This works fine via HA API, just seems to be missing from web_server

[github-actions[bot]]

🏷️ I've automatically added the component: web_server label to help categorize this feature request.