6d67c051f0
The reference footer was anchored to a fixed position near the bottom margin, causing it to overlap with notes text on songs that had both notes and references (e.g., "Die Gedanken sind frei"). Changed renderReferenceFooter to use flow-based positioning from the current y-position after notes/metadata, ensuring the separator line, abbreviation headers, and page numbers always render below the preceding content without overlap. Also updated calculateFooterReservation and MeasurementEngine to match the simplified layout calculation, and added toc.highlight_column to the example songbook.yaml to demonstrate column highlighting. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>