Fix XLSX save after deleting formatted columns

[freddy-bio]

Deleting a column with a custom width leaves its stable column ID in ColInfoManager. XLSX save then calls fetch_col_idx(...).unwrap() for that deleted ID and panics with ColIndexUnavailable, so an otherwise valid workbook cannot be exported.

Remove the deleted column's formatting when DeleteCols runs, and skip orphaned column metadata in the XLSX writer so already-affected in-memory workbooks can also save. A regression test covers save/reload after deletion and saving after undo/redo.

Validation: cargo test -p logisheets_controller --lib (473 passed); cargo fmt --all -- --check.

[vercel]

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[ImJeremyHe]

@freddy-bio Thanks for your contribution. May I ask why this PR is closed?

[freddy-bio]

hey, thanks to you.

I apologise, Codex did this automatically, and I didn't test it as didn't have time, so I proceeded to close it. Sorry about this.