fix(migration): make Electron path test cross-platform

Resolve Electron userData fixtures for macOS, Windows, and Linux so the migration regression test exercises the path selected by the current runner.

packages/node-runtime/src/migrations/electron-data-migration.test.ts

@@ -7,23 +7,20 @@ import { mock, test } from 'node:test'
 test('Electron migration moves persistent system data but leaves legacy temp data untouched', async (t) => {
   const root = fs.mkdtempSync(path.join(process.env.CHATLAB_TEST_TMPDIR ?? os.tmpdir(), 'chatlab-electron-migration-'))
   const originalHome = process.env.HOME
-  const electronUserData = path.join(root, 'Library', 'Application Support', 'ChatLab')
-  const electronDataDir = path.join(electronUserData, 'data')
+  const originalAppData = process.env.APPDATA
+  const appDataDir = path.join(root, 'AppData', 'Roaming')
   const systemDir = path.join(root, 'system')
   const configWrites: Array<{ section: string; key: string; value: unknown }> = []
   t.after(() => {
     if (originalHome === undefined) delete process.env.HOME
     else process.env.HOME = originalHome
+    if (originalAppData === undefined) delete process.env.APPDATA
+    else process.env.APPDATA = originalAppData
     fs.rmSync(root, { recursive: true, force: true })
   })
 
   process.env.HOME = root
-  fs.mkdirSync(path.join(electronDataDir, 'databases'), { recursive: true })
-  fs.mkdirSync(path.join(electronDataDir, 'ai'), { recursive: true })
-  fs.mkdirSync(path.join(electronDataDir, 'temp'), { recursive: true })
-  fs.writeFileSync(path.join(electronDataDir, 'databases', 'session.db'), 'sqlite')
-  fs.writeFileSync(path.join(electronDataDir, 'ai', 'settings.json'), '{}')
-  fs.writeFileSync(path.join(electronDataDir, 'temp', 'stale.tmp'), 'temporary')
+  process.env.APPDATA = appDataDir
 
   await mock.module('@openchatlab/config', {
     namedExports: {
@@ -33,7 +30,30 @@ test('Electron migration moves persistent system data but leaves legacy temp dat
     },
   })
 
-  const { migrateFromElectronIfNeeded } = await import('./electron-data-migration.js')
+  const { getElectronUserDataDir, migrateFromElectronIfNeeded } = await import('./electron-data-migration.js')
+  assert.equal(
+    getElectronUserDataDir({ platform: 'darwin', homeDir: root }),
+    path.join(root, 'Library', 'Application Support', 'ChatLab')
+  )
+  assert.equal(
+    getElectronUserDataDir({ platform: 'win32', homeDir: root, appDataDir }),
+    path.join(appDataDir, 'ChatLab')
+  )
+  assert.equal(getElectronUserDataDir({ platform: 'linux', homeDir: root }), path.join(root, '.config', 'ChatLab'))
+
+  const electronUserData = getElectronUserDataDir({
+    platform: process.platform,
+    homeDir: root,
+    appDataDir,
+  })
+  const electronDataDir = path.join(electronUserData, 'data')
+  fs.mkdirSync(path.join(electronDataDir, 'databases'), { recursive: true })
+  fs.mkdirSync(path.join(electronDataDir, 'ai'), { recursive: true })
+  fs.mkdirSync(path.join(electronDataDir, 'temp'), { recursive: true })
+  fs.writeFileSync(path.join(electronDataDir, 'databases', 'session.db'), 'sqlite')
+  fs.writeFileSync(path.join(electronDataDir, 'ai', 'settings.json'), '{}')
+  fs.writeFileSync(path.join(electronDataDir, 'temp', 'stale.tmp'), 'temporary')
+
   const result = migrateFromElectronIfNeeded(systemDir)
 
   assert.equal(result.migrated, true)

packages/node-runtime/src/migrations/electron-data-migration.ts

@@ -30,13 +30,19 @@ interface StorageConfig {
  * - Windows: %APPDATA%/ChatLab/
  * - Linux:   ~/.config/ChatLab/
  */
-function getElectronUserDataDir(): string {
-  const home = os.homedir()
-  switch (process.platform) {
+export function getElectronUserDataDir(
+  options: {
+    platform?: NodeJS.Platform
+    homeDir?: string
+    appDataDir?: string
+  } = {}
+): string {
+  const home = options.homeDir ?? os.homedir()
+  switch (options.platform ?? process.platform) {
     case 'darwin':
       return path.join(home, 'Library', 'Application Support', 'ChatLab')
     case 'win32': {
-      const appData = process.env.APPDATA || path.join(home, 'AppData', 'Roaming')
+      const appData = options.appDataDir ?? process.env.APPDATA ?? path.join(home, 'AppData', 'Roaming')
       return path.join(appData, 'ChatLab')
     }
     default: