TypeError when attempting to Generate Fix from Review Details

## Problem
When attempting to generate a fix from the Amazon Q Review Details view, receiving a TypeError indicating an invalid path argument.

## Steps to reproduce the issue

1. Start a `/review` command in VSCode
2. Right-click on an inconsistent issue
3. Select "Amazon Q: View Details"
4. Click the "Generate Fix" button

Receiving error: `[error] aws.amazonq.generateFix: TypeError: The "path" argument must be of type string. Received undefined [ERR_INVALID_ARG_TYPE]`

## Expected behavior:
The Generate Fix button should create a fix for the selected issue without throwing a path-related error.

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

OS: Darwin arm64 24.5.0
Visual Studio Code extension host: 1.102.2
Amazon Q: 1.85.0
node: 22.15.1
electron: 35.6.0

Start by reproducing the Generate Fix flow in the VSCode extension using the listed review steps and system versions, then trace the generateFix request to identify where the undefined path is introduced. Done means the Generate Fix button creates a fix for the selected review issue without the path-related TypeError.

Written by the indexing model from the issue text.