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1. Header detection: Add 25% cap to single-cell heading heuristic.
On German synonym dicts where most rows naturally have only 1
content cell, the old logic marked 60%+ of rows as headers.
2. IPA de/all mode: Use "column_text" (light processing) for non-
English columns instead of "column_en" (full processing). The
full path runs _insert_missing_ipa() which splits on whitespace,
matches English prefixes ("bildschön" → "bild"), and truncates
the rest — destroying German comma-separated synonym lists.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>