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[BrianHung]

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Note

Adds support for $ absolute/mixed A1 references in the worksheet parser, updates examples to safely overwrite existing XLSX files, and adds a brief Haiku section to the README.

• Parser (xlsx/src/import/worksheets.rs):
  • parse_reference now handles $ absolute/mixed A1 references and uppercases column letters.
  • Adds unit tests for absolute and mixed references.
• Examples (xlsx/examples/...):
  • hello_calc.rs, hello_styles.rs, widths_and_heights.rs: remove existing output file if present before save_to_xlsx; use output_path variable.
• Docs:
  • README.md: add a short “Haiku Interlude” section.

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