feat(sheets): add chart data update shortcut

[zhengzhijiej-tech]

Problem

Updating chart data sources required a full chart snapshot or deleting and recreating the chart. This made range and series corrections error-prone.

Changes

• Add +chart-data-update for range and direction updates.
• Add --dim1-index and --dim2-indexes for explicit series selection.
• Support batch-update with per-operation failure handling.
• Sync generated flag definitions and chart reference documentation.

Validation

• go test -count=1 ./shortcuts/sheets/...
• go vet ./shortcuts/sheets/...
• ./build.sh
• Standalone and batch dry-run request verification

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/chart-partial-update

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