fix: validate dataset name and columns before submission

[balasiddarthan22]

Submitting with an empty name or zero columns reached the backend and returned a cryptic 'Invalid request' error. Now caught on the client with a clear message before the API call is made.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: afb5eda1-27f5-469a-8268-ffdc2696f01c

📥 Commits

Reviewing files that changed from the base of the PR and between 5a2e7c3 and a82709d.

📒 Files selected for processing (1)

• frontend/app/dataset/new/page.tsx

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📝 Walkthrough

Walkthrough

This PR adds pre-flight validation to the dataset creation flow. When a user clicks "Confirm" to create a dataset, the handleConfirm function now checks that the dataset name is not empty and that at least one column has been defined. If either check fails, the function displays an error message and returns early without attempting to call the backend mutation. The changes are localized to the event handler and do not modify the component's state management or API contract.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding validation for dataset name and columns before submission.
Description check	✅ Passed	The description is directly related to the changeset, explaining the problem (empty submission reaching backend with cryptic error) and the solution (client-side validation with clear messages).
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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