fix reset step state when selecting dataset or notebook

[Felipedino]

This pull request makes a small update to the dataset and notebook selection logic in the DatasetsContent component. Now, when a user selects a dataset or a notebook, the current step is reset to 0, ensuring the UI starts from the initial step for each new selection.

• User experience improvements:
  • Reset the step state to 0 when a dataset or notebook is selected, so the interface always starts from the beginning for each new selection.

[Copilot]

Pull request overview

This pull request fixes a UI state management issue by resetting the step state to 0 when users select a dataset or notebook from the sidebar. This ensures the interface always displays the correct view (dataset/notebook visualization) rather than potentially showing an upload workflow step when clicking on existing items.

Changes:

• Added setStep(0) call in handleDatasetClick function to reset UI step when a dataset is selected
• Added setStep(0) call in handleNotebookClick function to reset UI step when a notebook is selected

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