fix: TECH-9140 file validation#239
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TECH-9140 file type validation
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TECH-9140 file type validation
Summary
This PR adds client-side file validation before storing uploaded files in the upload flow state.
For uploads that proceed to column mapping, only .csv and .xlsx files are now accepted. Unsupported files such as .doc, .docx, .png, or .pdf are rejected immediately with a clear error message, preventing users from advancing to the mapping step with invalid files.
Unstructured uploads continue to allow their broader set of image and document formats, and no longer run header detection logic that only applies to structured/mapping uploads.