[DevEX] Easy preview-to-code and cross-file navigation

1. Currently, we need a few clicks to move between preview and code and the more clicks to get back to the exact file we just edited

2. The location is also reset when moving between files

I understand that code editing is secondary to chatting, which might be why it's less accessible

Suggestions

1. Move the code out of “workspace” and allow keeping the preview open while coding

2. Expand Monaco editor to be entire vscode to benefit tabs, search, go to etc.