Feature: Local Workspace Auto-Save & State Persistence (Offline-First)

[YurMil]

If a user refreshes the browser or closes the tab, the loaded documents, page configurations, and filled forms are lost. A professional web tool should save the session state locally so the user can pick up exactly where they left off.

Technical Proposal:

1. Use IndexedDB (via a lightweight wrapper like idb or localForage) to save the binary File objects of the imported PDFs.
2. Periodically serialize the Zustand store state (documentOrder, pageOrder, pages, documents) to LocalStorage or IndexedDB.
3. On application startup, load the serialized workspace state and re-hydrate the files and object URLs from IndexedDB, displaying the restored canvas.

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