fix: chat widget is black again

[juliankepka]

Not a pretty fix. The widget renders into a closed shadow root, so no stylesheet from the host
page can reach inside. I tried globals.css with !important and it stays white. Custom properties
do inherit through the boundary, but the bubble icon isn't themed through one: the widget hardcodes
.c7-bubble svg { stroke: white; }.

So the only option on our side is patching attachShadow to force the root open and inject an
override (the async → defer switch makes sure our patch runs first).

Proper fix belongs upstream: that stroke: white should be black, or driven by a custom property so
it can be themed from outside. Happy to drop this workaround once that exists.

[juliankepka]

Unfortunately this wasn't a good solution. I should have informed myself better about the
implications of dangerouslySetInnerHTML. At this point I don't see a way to fix it on our side and
will have to look at the chat widget upstream, with its shadow root.