Use theme preference from IDE when embedded instead of preference (#6581)
* Use theme preference from IDE when embedded instead of preference
Currently the theme always comes from the preference and ignores what the IDE passes. Since there's no way to un-set the preference (or change it in the UI when embedded) this may prevent it matching the IDE.
This change always uses the IDE preference when embedded. It requires a change in VS Code to pass embed=true when embedding the sidebar since this was missing originally.