🧹 [code health improvement] Reuse safeRollbackSavepoint in updateCellBatch

[google-labs-jules]

• 🎯 What: The inline rollback savepoint logic in updateCellBatch was duplicated and hardcoded.
• 💡 Why: By reusing the safeRollbackSavepoint method, this improves readability, reduces duplication, and makes error handling more maintainable.
• ✅ Verification: Ran npm run test which passes, and verified with bun build src/core/engine/wasm/WasmDatabaseEngine.ts --no-bundle to ensure no typescript errors.
• ✨ Result: Reduced duplicate code.

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PR created automatically by Jules for task 17299708239335160897 started by @zknpr

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Project	Deployment	Actions	Updated (UTC)
sq-lite-explorer	Ready	Preview, Comment	Jun 13, 2026 5:39pm