UI updates staged behind debug mode flags. Initial new views added in app.tsx, rendered based on the current debug setting. Updates tailscale/corp#14335 Signed-off-by: Sonia Appasamy <sonia@tailscale.com>
Also allows us to use absolute import paths (see change in index.tsx). Updates tailscale/corp#13775 Signed-off-by: Sonia Appasamy <sonia@tailscale.com>