Fix shared formula expansion for whole-row and whole-column references

[JunWang-Lin]

Closes #349.

Summary

• avoid panicking while expanding shared formulas that contain whole-column or whole-row references
• adjust whole-column references only along the column axis and whole-row references only along the row axis
• preserve absolute row/column locks and named ranges
• produce #REF! when an adjusted reference moves out of bounds
• add regression tests for cell, whole-column, and whole-row references

Root cause

Shared-formula expansion assumed every parsed reference had both a row and a column coordinate. Valid formulas such as VLOOKUP(G3,A:B,2,FALSE) contain a whole-column reference with no row coordinate, so the expansion path unwrapped None and panicked.

Validation

• cargo +nightly fmt
• cargo clippy --lib -- -D warnings
• cargo test (299 passed, 23 ignored)
• verified the original workbook formula IF(G3="","",VLOOKUP(G3,A:B,2,FALSE))

Note

The second commit restores a missing } in the existing number_formater test module on the current upstream master; without it, the repository cannot be formatted or compiled for validation.