Redesign the OCR viewer interface with a modern developer-tool aesthetic:
- New color system with layered surfaces and indigo accents
- Dark mode with deeper tones and refined contrast
- Branded navigation with official OCR logo (inline SVG)
- Improved card, table, and accordion components
- Subtle animations with prefers-reduced-motion support
- System font stack (no external dependencies)
- color-mix() with proper fallbacks for older browsers
- Responsive layout improvements
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