better dev script (#1961)

script/artcraft/unix_dev.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+# Start the desktop frontend and Rust/Tauri watcher together on macOS or Linux.
+set -euo pipefail
+
+root_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/../.." && pwd)"
+frontend_path="${root_dir}/frontend"
+
+if [[ "${1:-}" == "--help" || "${1:-}" == "-h" ]]; then
+  cat <<'HELP'
+Usage: ./script/artcraft/unix_dev.sh
+
+Starts Vite with React/CSS hot reload and Tauri with Rust rebuild/restart.
+Finds and binds a free loopback port starting at ARTCRAFT_DEV_PORT (default: 5193),
+then passes that exact URL to Tauri. HMR shares the frontend port.
+Rust uses native Tauri IPC and does not need a second HTTP port.
+Ctrl-C stops this launcher's frontend, Rust watcher, and desktop app.
+
+Requires Node.js 20+, npm, Rust, cargo-tauri 2, and Tauri platform prerequisites.
+Installs frontend dependencies only when the local Vite installation is missing.
+Run this command instead of running the two legacy dev scripts together.
+HELP
+  exit 0
+fi
+
+if [[ $# -ne 0 ]]; then
+  echo "Unknown argument: $1 (see --help)" >&2
+  exit 1
+fi
+
+source "${root_dir}/script/common/frontend_preflight.sh"
+frontend_preflight "${frontend_path}"
+
+if ! command -v cargo >/dev/null || ! cargo tauri --version >/dev/null 2>&1; then
+  echo 'ERROR: Install Rust and the Tauri CLI: cargo install tauri-cli --version "^2" --locked' >&2
+  exit 1
+fi
+
+cd "${frontend_path}"
+if [[ ! -f node_modules/vite/package.json ]]; then
+  # Do not use the legacy install helper: its failure recovery deletes caches.
+  npm install
+fi
+
+exec node "${frontend_path}/scripts/unix-dev.mjs"