Add script for running Electron in development mode and update package.json and main.cjs accordingly

scripts/run-electron-dev.cjs

@@ -0,0 +1,67 @@
+const { spawn } = require('child_process')
+const path = require('path')
+const waitOn = require('wait-on')
+
+const projectRoot = path.resolve(__dirname, '..')
+const electronBinary = require('electron')
+const relaunchExitCode = 75
+const startupResources = ['http://localhost:5173', 'tcp:8000']
+const env = {
+  ...process.env,
+  VITE_DEV_SERVER_URL: process.env.VITE_DEV_SERVER_URL || 'http://localhost:5173',
+  HEIMGEIST_DEV_WRAPPER: '1',
+  HEIMGEIST_DEV_RELAUNCH_CODE: String(relaunchExitCode),
+}
+
+async function waitForDependencies() {
+  await waitOn({
+    resources: startupResources,
+    timeout: 120000,
+  })
+}
+
+function sleep(ms) {
+  return new Promise((resolve) => {
+    setTimeout(resolve, ms)
+  })
+}
+
+function runElectronOnce() {
+  return new Promise((resolve) => {
+    const child = spawn(electronBinary, ['.'], {
+      cwd: projectRoot,
+      env,
+      stdio: 'inherit',
+    })
+
+    child.on('exit', (code, signal) => {
+      resolve({ code, signal })
+    })
+  })
+}
+
+async function main() {
+  await waitForDependencies()
+
+  while (true) {
+    const { code, signal } = await runElectronOnce()
+
+    if (signal) {
+      process.kill(process.pid, signal)
+      return
+    }
+
+    if (code === relaunchExitCode) {
+      await sleep(750)
+      await waitForDependencies()
+      continue
+    }
+
+    process.exit(code ?? 0)
+  }
+}
+
+main().catch((error) => {
+  console.error('Failed to launch Electron dev wrapper:', error)
+  process.exit(1)
+})