Solid chat icon

[kerryarchibald]

Figma: https://www.figma.com/file/gkNXqPoiJhEv2wt0EJpew4/Compound-Icons?type=design&node-id=1098-28211&mode=design&t=UfapfbEDa7Muwp3T-0

Video rooms need to link the chat/timeline from the room header. Other room header icons are all solid.

EW issue: element-hq/element-web#26181

EW fix: (using custom css to make existing chat icon solid)

https://www.figma.com/file/gkNXqPoiJhEv2wt0EJpew4/Compound-Icons?type=design&node-id=3092-21&mode=design&t=FeubIJWLyiD3mcLi-0

[americanrefugee]

I created a new icon and room header component for video rooms to show a solid chat icon button. Do you need anything else?