066724318a
## Summary - Reworked the product creation modal around warp/weft yarn ratio tables. - Added yarn selection, create-yarn entry points, ratio validation feedback, and ratio-based weight calculation. - Updated frontend service/types coverage and tests for the product workflow. ## Why The product creation flow previously did not guide users through structured warp/weft yarn ratios, making it easy to enter incomplete or invalid ratio data. The new flow makes the yarn composition explicit and blocks invalid product submission. ## Impact Users can select existing yarns or create yarns while adding a product, edit ratio values per row, and calculate batch weights once both yarn sides are valid. ## Validation - `pnpm test` - `pnpm build`