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Rebuilt Excel parser

We rebuilt our Excel parser from scratch with major improvements:

  • New Rust-based parser — significantly faster parsing on large files.
  • Hidden content control — new options to control handling of hidden rows, columns, and sheets.
  • Formula handling — configure how formulas are evaluated or preserved during parsing.
  • Improved LLM-based layout segmentation — better detection and segmentation of tables, figures, and sections within sheets.