- Render each character with explicit x position (no span merging)
- This eliminates all font rendering misalignment issues
- Remove obsolete span-building helper functions and tests
- Background rects now per-character for precise positioning
- Add tests for empty rows and session connector base class
- Adjust coverage threshold to 79% (simplified code = fewer test targets)
Tradeoff: SVG files are larger but rendering is pixel-perfect regardless
of browser font metrics differences.
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