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Fix invalid or duplicate SKU values in Shopify CSV

SKU values should be consistent, non-empty for tracked variants, and unique when required by your workflow.

Before and after example

Handle,Variant SKU
summer-tee, SKU-001 
summer-tee,SKU-001

Handle,Variant SKU
summer-tee,SKU-001
summer-tee,SKU-001-B

1. 1. Remove leading and trailing whitespace from SKU cells.
2. 2. Replace blanks with a deterministic SKU format.
3. 3. Eliminate accidental duplicates.

Duplicate or malformed SKUs can break downstream inventory syncing even when import completes, so fix them before upload.