Function writeSheet

writeSheet(
    transactions: Transaction[],
    sheetName: string,
    sheetId: string,
): Promise<void>
Writes transaction data to a specified Google Sheet. This function performs the following operations:
1. Validates the required configuration settings.
2. Clears existing data from the target sheet.
3. Writes the provided transaction data to the sheet.
Parameters
- transactions: Transaction[]
  Array of transaction rows to write to the sheet.
- sheetName: string
  Name of the target Google Sheet (e.g., "expenses", "incomes").
- sheetId: string
  Google Spreadsheet ID where the sheet is located.
Returns Promise<void>
Promise Resolves when data is successfully written.

Throws
Error If configuration is invalid, sheet clearing fails, or writing data fails.
- Defined in src/features/googleSheetService.ts:129