Reference between frontend and backend causes VSCode build problems

[aaronpowell]

There's a direct project reference between the frontend and backend projects and this causes a problem in VS Code when you try to launch both debuggers at the same time as it becomes a race condition on who is writing the DLLs first, causing one of the debugger commands to fail.

Given #170 is underway, is it worth moving away from having two separate projects and using a single project based on the new Blazor app type that is coming in .NET 8?