fix(harness): export each Excel GT sheet as its own PDF

[developer0hye]

What changed

scripts/macos/export_excel_pdfs.applescript now hides every other visible sheet (chart sheets included) around each per-sheet save as, then restores exactly the sheets it hid, so each <id>-sheet-NNNN.pdf contains exactly one worksheet.

Why

Excel's AppleScript save as is a workbook-level command — applied to a worksheet it still delegates to the workbook's SaveAs, and a PDF SaveAs always exports every visible sheet. The per-sheet loop therefore wrote N whole-workbook copies, and public_visual_audit.rs concatenated them with pdfunite: every multi-sheet GT page count and text-length baseline was inflated by the sheet count (a 10-sheet workbook exported 230 GT pages for a real 23).

Key changes

• hideOtherVisibleSheets: walks every sheet of the workbook, matches by name (object-specifier equality is unreliable), hides only currently-visible sheets, returns their names. Hidden/very-hidden sheets are never touched; the current sheet stays visible, so the at-least-one-visible-sheet rule can't trip.
• restoreSheetVisibility: restores exactly the recorded sheets before the next iteration's visibility check.
• Both handlers wrap Excel terminology in their own tell application block (they sit outside the main tell).
• Convention decided per the issue's open question: all visible sheets, one PDF per sheet, matching what the converter renders and the existing pdfunite combine step in public_visual_audit.rs (unchanged).

Verification

Ran the fixed exporter through real Excel on the 10-sheet tests/fixtures/xlsx/office2pdf_repository_workbook.xlsx:

• 10 per-sheet PDFs, page counts 1, 5, 3, 1, 1, 6, 1, 2, 1, 2 — sum exactly 23 (before: every PDF was the whole 23-page workbook)
• each PDF samples to its own sheet's text; all file sizes distinct
• osacompile clean; Excel quit cleanly

Known trade-off: structure-protected workbooks now fail loudly at the first hide instead of silently producing duplicated GT — preferable for a ground-truth exporter.

No Rust code touched; the default cargo test suite is unaffected (harness-only change consumed by the #[ignore]d visual audit on macOS).

Related: #616

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