ec47045c15
Replace _split_oversized_rows() with _regularize_row_grid(). When ≥60% of content rows have consistent height (±25% of median), overlay a uniform grid with the standard row height over the entire content area. This leverages the fact that books/vocab lists use constant row heights. Validates grid by checking ≥85% of words land in a grid row. Falls back to gap-based rows if heights are too irregular or words don't fit. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>