docs(sheets): strengthen lark-sheets references for common editing pitfalls

[zhengzhijiej-tech]

What

Strengthens six lark-sheets skill references with targeted guidance for common spreadsheet-editing pitfalls observed when driving sheets through the CLI. Documentation-only — no code or schema changes.

Changes

• write-cells — sanity-check units / dimension conversion / quantity factors before formula writes (a formula can run clean yet be off by a constant factor); keep derived output off original data columns to avoid clobbering source data.
• core-operations — prefer live formulas for derived values even when "live update" isn't explicitly stated; scope rewrite/transform precisely so rows/columns that should stay unchanged are kept 1:1; treat header-stated format rules as checklist items; confirm the artifact file actually exists before finishing; write back bare values from local scripts.
• visual-standards — apply border/header formatting on explicit request and identify the real header row; keep font size consistent with the source.
• range-operations — keep total column width within A4 for printing.
• read-data — dedup/compare long numbers via raw values rather than CSV formatted display (scientific notation collapses distinct numbers and causes false duplicates).
• chart — format date/number axes via source-cell number_format; place charts outside the data area so they don't cover existing data.

[coderabbitai]

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