feat: implement mobile-first responsive design for speed memory quiz
Convert all CSS-in-JS responsive objects to mobile-first inline styles to eliminate CSS specificity conflicts and ensure no-scrolling mobile experience across all game phases. Key improvements: - Setup phase: mobile-friendly 2-column difficulty grid with optimized spacing - Display phase: compact progress indicators and mobile-sized abacus container - Input phase: responsive stats section with flexWrap and mobile button sizing - Results phase: optimized card grids with mobile-first dimensions - All phases: replaced color tokens with hex values, reduced font sizes and padding for mobile 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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