Relocate the slider control from a separate container below the level
display to inside the level pane itself, positioned above the abacus.
Changes:
- Move slider markup into main level display pane
- Position between level info and abacus display
- Remove separate slider container that was below
- Adjust spacing for better visual hierarchy
Improves UX by keeping the control close to the content it affects.
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Co-Authored-By: Claude <noreply@anthropic.com>