fix/chat: Wait for 'ready' before sending theme data. #2371
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We used to inject themes using CSSOM injected by the client. We moved this code to the Agent to share it with VS, etc. and used DOMContentLoaded as the signal to do it. This races with webview React, which may be responding to this signal by DOMContentLoaded, but is not guaranteed to be.
Now we watch for the webview to send the 'ready' event before dispatching the initial theme update message.
Fixes CODY-3796, BUGS-126, BUGS-233, BUGS-154.
Test plan
Manually tested: