- Add ten-frames visualization for regrouping concepts
- Stacked vertical layout (top frame = carry, bottom frame = current place)
- Square cells with differentiated borders (0.8pt outer, 0.4pt internal at 30% opacity)
- Place value color coding matches answer boxes
- Ten-frames sized at 90% of cell width for proper alignment
- 2.5pt gap between tens and ones ten-frames for visual clarity
- Add "for all place values" option for ten-frames
- Show ten-frames only for regrouping (default) or for all problems
- Dynamic label updates based on checkbox state
- Indented sub-option UI in config panel
- Improve typography with "New Computer Modern Math" font
- Fix layout calculations
- Remove gutter-based spacing for consistent problem sizing
- Dynamic cell size based on ten-frames option
- Proper height allocation for ten-frames row
- Add cache busting for ten-frames settings in preview
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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