Add an icon on windows + show CWD in notification title

[PurpleMyst]

Summary

Add Windows Toast notifications with icon support and project name in title.

Changes

• feat: Windows Toast icon support

  • Add logo.png as app icon for Windows notifications
  • Use ToastImageAndText02 template with custom image path
  • Resolve icon path for WSL compatibility via wslpath -w

• feat: show project name in notification title

  • Title now shows Pi (projectName) instead of just Pi
  • Project name extracted from current working directory

• fix: PowerShell XML manipulation

  • Switch from GetElementsByTagName to SelectSingleNode to avoid "Collection was modified" errors

• chore: TypeScript setup

  • Add tsconfig.json, @types/node, and typescript devDependencies
  • Add pi-coding-agent.d.ts type declarations
  • Add .gitignore for node_modules/, dist/, logs

Testing

Notifications should display correctly on:

• Windows Terminal with icon and proper title/description
• iTerm2, Kitty, Ghostty/WezTerm via OSC protocols
• tmux passthrough support maintained