Memory crash due high memory usage

### What happened?

[ACTION REQUIRED] 📎 PLEASE ATTACH THE EXPORTED CHAT HISTORY JSON FILE TO THIS ISSUE IF YOU FEEL COMFORTABLE SHARING IT.

### What did you expect to happen?

[bug-report-history-1783784298347.json](https://github.com/user-attachments/files/29926987/bug-report-history-1783784298347.json)

### Client information

* **CLI Version:** 0.50.0
* **Git Commit:** 8d9733d53
* **Session ID:** 0dba6383-a5d0-4102-aefb-27dcb2196ad7
* **Operating System:** linux v22.22.2
* **Sandbox Environment:** no sandbox
* **Model Version:** gemma-4-31b-it
* **Auth Type:** gemini-api-key
* **Memory Usage:** 7.08 GB
* **Terminal Name:** VTE(8400)
* **Terminal Background:** #1c1c1f
* **Kitty Keyboard Protocol:** Unsupported

### Login information

_No response_

### Anything else we need to know?

_No response_

Start by reproducing the memory crash in CLI version 0.50.0 using the attached exported chat history JSON and the reported Linux environment. Inspect the behavior around the 7.08 GB memory usage; done means the same workload no longer crashes or reaches excessive memory usage.

Written by the indexing model from the issue text.