[WIP] Enhance workout session management and UI interactions

[Copilot]

Plan to Address PR Review Comments

• Fix potential infinite loop in WorkoutSession useEffect (lines 106-132)
  • Added useRef to track if auto-start has already been processed
  • Prevents unnecessary re-execution when isActive changes
• Add default button style resets to .split-card.clickable CSS
  • Reset border, background, padding, color, text-align, appearance
  • Ensures clickable cards render consistently across browsers
• Clarify completion message text in SplitProgressTracker
  • Changed from "repeat it or start next week's training" to "redo it"
  • More accurate to actual functionality
• Add safety checks for missing callbacks in handleCardClick
  • Added console warnings when callbacks are undefined
  • Prevents silent failures
  • Updated warning messages to be more specific about impact

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