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When OCR merges adjacent words from different columns into one word box (e.g. "sichzie" spanning Col 1+2, "dasZimmer" crossing boundary), the grid builder assigned the entire merged word to one column. New _split_cross_column_words() function splits these at column boundaries using case transitions and spellchecker validation to avoid false positives on real words like "oder", "Kabel", "Zeitung". Regression: 12/12 GT sessions pass with diff=+0. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>