fix: dataset select check

[c121914yu]

No description provided.

[sweep-ai]

Hey @c121914yu, here is an example of how you can ask me to improve this pull request:

@Sweep Add unit tests for the `DatasetSelectModal` component that verify:
1. The correct `activeVectorModel` is computed based on the selected datasets
2. The color of the vector model name changes correctly when it matches/doesn't match the active vector model
3. The warning message appears when selecting datasets with different vector models

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