Expands whiteout detection to handle:
- White rectangles (RGB >= 0.95) - correction tape / white-out
- Black rectangles (RGB <= 0.05) - redaction / censoring
- Other solid fills (very dark or very light) - potential covering
Adds color_type to covered text results for better logging.
Logs now show breakdown by cover type (white, black, other).
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Co-Authored-By: Claude <noreply@anthropic.com>
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