Program Mode Improvements (Issue #7 Feedback)

Added:
• Program duplication via long-press menu
• Edit sets/interval in confirm screen before starting
• Auto-scroll to newly added exercise
• "Add exercise" button fixed at bottom
• "Previous Record" button in Program mode
• Delete confirmation dialog for programs

Improved:
• Swipe-to-delete animation
• Program/Challenge buttons now update set count

Fixed:
• Save process stability
• Interval settings now saved correctly
• Start countdown now respects program settings
• Program screen accent colors unified