0.1.2

Improve PTY cwd handling; add postinstall

Validate and resolve session working directory: prefer a provided customCwd only if it exists, otherwise fall back to USERPROFILE/HOME and 'C:\' for Windows. Minor formatting cleanup in electron/main.ts (devTools line). Add a package.json postinstall script to run `electron-builder install-app-deps` so native Electron dependencies are installed after package install.