feat(ui): add desktop harness workbench

packages/ui/desktop/scripts/dev.mjs

@@ -0,0 +1,60 @@
+#!/usr/bin/env node
+import { spawn } from 'node:child_process'
+import { dirname, resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const here = dirname(fileURLToPath(import.meta.url))
+const packageRoot = resolve(here, '..')
+const repoRoot = resolve(packageRoot, '../../..')
+const viteUrl = process.env.DSH_DESKTOP_VITE_URL ?? 'http://127.0.0.1:5174'
+
+const vite = spawn(resolve(repoRoot, 'node_modules/.bin/vite'), [
+  '--host',
+  '127.0.0.1',
+  '--port',
+  '5174',
+], {
+  cwd: packageRoot,
+  env: { ...process.env },
+  stdio: ['ignore', 'pipe', 'pipe'],
+})
+
+let electronStarted = false
+let electron
+
+const startElectron = () => {
+  if (electronStarted) return
+  electronStarted = true
+  electron = spawn(resolve(repoRoot, 'node_modules/.bin/electron'), ['src/main.mjs'], {
+    cwd: packageRoot,
+    env: { ...process.env, VITE_DEV_SERVER_URL: viteUrl },
+    stdio: 'inherit',
+  })
+  electron.on('exit', (code, signal) => {
+    vite.kill('SIGTERM')
+    process.exit(code ?? (signal === null ? 0 : 1))
+  })
+}
+
+const pipeVite = (chunk, stream) => {
+  const text = chunk.toString()
+  stream.write(text)
+  if (text.includes('Local:') || text.includes(viteUrl)) startElectron()
+}
+
+vite.stdout.on('data', chunk => { pipeVite(chunk, process.stdout) })
+vite.stderr.on('data', chunk => { pipeVite(chunk, process.stderr) })
+vite.on('exit', (code, signal) => {
+  if (!electronStarted) process.exit(code ?? (signal === null ? 0 : 1))
+})
+
+setTimeout(startElectron, 2500)
+
+process.on('SIGINT', () => {
+  electron?.kill('SIGINT')
+  vite.kill('SIGINT')
+})
+process.on('SIGTERM', () => {
+  electron?.kill('SIGTERM')
+  vite.kill('SIGTERM')
+})