Amazon Q Developer - Error after some time of converting transaction lines into CSV

## Problem
Error after some time of converting transaction lines into CSV

## Steps to reproduce the issue
Highlight a months worth of transactions then ask "Convert each selected line into a comma separated list of date, description, amount, and balance fields". Do this for about 7 months and Amazon Q Developer throws an exception:

Amazon Q: Encountered an unexpected error when processing the request, please try again.

## Expected behavior
Expecting all lines to get converted to CSV

## System details (run `AWS: About` and/or `Amazon Q: About`)

- OS: Windows 11
- Visual Studio Code version: 1.97.2
- AWS Toolkit version: N/A
- Amazon Q version: 1.47.0

Reproduce the failure in Visual Studio Code 1.97.2 with Amazon Q 1.47.0 by selecting several months of transaction lines and requesting CSV conversion. No source files, tests, or entry points are named in the issue, so first trace the Amazon Q request path and identify where the unexpected error occurs; done means all selected lines convert to CSV.

Written by the indexing model from the issue text.