Implemented responsive grid system for product form checkboxes to improve UX
when dealing with multiple categories and tags.
Changes:
- Added CSS Grid layout with adaptive columns (1-4 based on screen width)
- Mobile (< 768px): 1 column
- Tablet (≥ 768px): 2 columns
- Desktop (≥ 1200px): 3 columns
- Wide screens (≥ 1600px): 4 columns
- Compact spacing (0.35rem gap) for better density
- Enhanced checkbox styling with hover effects and selected state
- JavaScript fallback for forced grid application and responsive resizing
- Improved form container width (col-12 col-xl-10) for better space usage
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Co-Authored-By: Claude <noreply@anthropic.com>