Change username color in chat with power level color (#2282)

* add active theme context

* add chroma js library

* add hook for accessible tag color

* disable reply user color - temporary

* render user color based on tag in room timeline

* remove default tag icons

* move accessible color function to plugins

* render user power color in reply

* increase username weight in timeline

* add default color for member power level tag

* show red slash in power color badge with no color

* show power level color in room input reply

* show power level username color in notifications

* show power level color in notification reply

* show power level color in message search

* render power level color in room pin menu

* add toggle for legacy username colors

* drop over saturation from member default color

* change border color of power color badge

* show legacy username color in direct rooms

src/app/components/message/layout/Base.tsx

@@ -24,6 +24,10 @@ export const Username = as<'span'>(({ as: AsUsername = 'span', className, ...pro
   <AsUsername className={classNames(css.Username, className)} {...props} ref={ref} />
 ));
 
+export const UsernameBold = as<'b'>(({ as: AsUsernameBold = 'b', className, ...props }, ref) => (
+  <AsUsernameBold className={classNames(css.UsernameBold, className)} {...props} ref={ref} />
+));
+
 export const MessageTextBody = as<'div', css.MessageTextBodyVariants & { notice?: boolean }>(
   ({ as: asComp = 'div', className, preWrap, jumboEmoji, emote, notice, ...props }, ref) => (
     <Text