- Remove dominant-baseline: text-before-edge (has Safari compatibility issues)
- Use separate y positions for rect (top of cell) and text (baseline)
- rect_y = padding + row * line_height (top of cell)
- text_y = rect_y + font_size (alphabetic baseline position)
This ensures background rects and text are properly aligned across all
browsers, fixing the half-line vertical offset on cursor blocks.
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