[dapp-kit] mark vanilla-extract libraries as dev dependencies

[williamrobertson13]

Description

Potentially addresses https://github.com/MystenLabs/sui/issues/20294. The vanilla-extract libraries are internal dependencies as we ship the library with raw CSS files.

Test plan

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Release notes

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• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] Indexer:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:
• [ ] REST API:

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