b6bac080bb
- Excel preview detects when a product already has a different STEP file linked - Excel preview detects intra-Excel conflicts (same product, different CAD model names) - Product STEP upload warns when replacing an existing file and shows render count - All warnings are non-blocking (amber badges, toast warnings) - LEARNINGS.md: all open items resolved Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>