CONV-083: Add dashboard upload flow smoke tests

[menvil]

Add size assertion and required-validation guard to upload smoke suite.

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Summary by cubic

Add smoke tests for the dashboard upload flow (CONV-083) to verify file size display and required validation. Tests check the "KB" size label after upload and ensure no file record is created when submitting without a file, keeping the step on upload and showing a required error.

^{Written for commit 3ff4da0. Summary will update on new commits.}

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