Default sidecar shim. Runs a dev-server command directly inside the Tauri window so hot/live reload works, with no release build.

The command defaults to mix phx.server but is configurable, so ExTauri is not tied to Phoenix:

config :ex_tauri, :dev_command, ~w(mix francis.server)

A command may be given as a list of arguments (recommended) or a raw string.