Clean Svelte based Text Editor with simple markup

This is a minimal Svelte + Vite scaffold for the IA Editor UI prototype.

Quick start (PowerShell):

npm install
npm run dev

Notes:

• This is a web dev scaffold. For a native desktop app wrap with Tauri later (recommended) or use Electron.
• File persistence currently uses localStorage. We'll swap to real filesystem when integrating Tauri.
• The editor uses a mirrored highlight layer so markup markers (like **, #, -) remain visible while styled.