LinkedIn renders label text twice in nested spans, producing
"Question? Question?" instead of "Question?". The old dedup only
caught exact concatenation (ABCABC); now also handles space-separated
duplicates by comparing left/right halves at the midpoint space.
Applied to all 4 copies: extractLabel, _extractLabel, normalizeLegend,
_normalizeLegend.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>