

### Bug Fixes
- 🧩 Fixed temp file race conditions during concurrent processing — temp files now use unique IDs with input filename + timestamp + random suffix instead of just a timestamp, preventing collisions.
- 📋 Fixed Canva CSV export — expanded columns from ["File", "Title", "Keywords"] to ["Filename", "Description", "Keywords", "Categories", "Editorial", "Mature content", "Illustration"] to match Canva's required template, with default values for the new fields.

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