Repair blank project IDs in stored Resume Studio docs

[DaKheera47]

Summary

• Repair existing stored Resume Studio project items with blank or whitespace-only IDs when the document is hydrated.
• Persist the repaired document with a revision bump so old data is normalized on read, not just on import.
• Keep the client-side CUID2 swap from the earlier fix so new item creation no longer depends on crypto.randomUUID().

Testing

• Added unit coverage for hydrating a stored document that contains blank project IDs, preserving existing IDs while generating replacements for missing ones.
• Ran focused server and client tests, plus the full orchestrator test suite, with all checks passing.

[DaKheera47]

Moving way from crypto entirely. we already have cuid2 for ids, just using that consistently