fix: replace simulated AuthPortal with real passkey/OAuth sign-in

fix: replace window.print() with html2pdf.js for direct PDF export

feat: implement passkey auth, OAuth, Paddle payments, and email DI

feat: replace simulated features with real implementations

feat: implement unique guest accounts via device UUID and claiming flow

fix: replace fake Math.random() token tracking with real token counts from AI API responses

Resolve all security vulnerabilities, bug fixes, and print watermarking configurations based on product review

refactor: safe editor folding, centralize api client headers, sync cloud preferences, and add tests

fix: resolve QR scanner and shared link routing issues by parsing full href and fixing activeDocId race condition

feat: make realtime AI tools hideable, add layout toggle, and ensure dropdowns are fully theme aware

feat: add close buttons to Folder Sidebar, Sync Logs, AI Panel, and Live Preview

refactor: Modularize frontend App.tsx into custom hooks and components and resolve Vite import.meta types