Add view in room link in thread root event

[germain-gg]

Design

• @janogarcia to choose the icon to use in this context

Figma file: Flow – Thread actions (figure 03b)

Requirements

Implement a context menu item to "view in room". This options only applies to the root event of the thread as it is the only event that lives both in the main room timeline and the thread sidebar.

[janogarcia]

@gsouquet Flattened and optimized. view-in-room.svg.zip