CONV-081: Add upload loading state

[menvil]

Show 'Uploading…' label and disable input while upload/store runs.

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Summary by cubic

Adds an upload loading state to the dashboard converter: shows "Uploading…" and disables the file input while upload or storeUpload run. Prevents double submissions and meets Linear CONV-081.

^{Written for commit ca36bbf. Summary will update on new commits.}

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