- Point the flake app at the `t3code` binary - Keep `default` mapped to `t3code-desktop`
- Export `t3code-desktop` on all systems - Switch `default` package and app to the desktop build - Keep server package and app available
- Move shared Node module setup into `packages/common.nix` - Rename package entrypoints under `packages/server` and `packages/desktop` - Update flake outputs to expose `t3code-server` as the default