✨ Complete UI redesign of UploadSalesDataStep to match beautiful recipe step pattern:
- Add "Why This Matters" info box with icon and explanation
- Replace summary section with clean progress indicator showing count and success state
- Change product list from vertical layout to responsive 2-column grid
- Implement custom checkboxes with visual checkmark instead of native inputs
- Separate edit form into gradient-background section (matching recipe templates)
- Update file format guide colors from hardcoded blue to CSS variables
- Clean up actions sections and remove unnecessary comments
- Add emojis for visual interest (❄️ refrigeration, 🧊 freezing, 🌿 seasonal, 📊 sales)
- Improve spacing, hierarchy, and overall visual consistency throughout
The AI suggestions step now has the same beautiful, modern, and easy-to-use
UI/UX as the recipe step, providing a consistent onboarding experience.
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