Hard line breaks inserted into API response text - persists through all copy/export methods

My OS version: macOS 26.3 (25D125)

My BoltAI app version: BoltAI 2 v2.8.1

Are you a Setapp user: No

AI provider & model: Anthropic — Claude Sonnet 4.6

Steps to reproduce the issue:

1. Start a chat and request a multi-paragraph response

2. Observe that the displayed output contains line breaks mid-sentence or mid-paragraph, appearing to align with the display width rather than paragraph boundaries

3. Try each of the following copy/export methods — the line breaks persist in all cases:

   • Copy icon for the entire chat

   • Copy icon for a Markdown artifact

   • Manual text selection and copy

   • File > Export as Markdown

Error message: No error message is displayed. The issue is that hard line breaks are being baked into the response text rather than reflecting the actual API output. Because the breaks survive export to a Markdown file, this rules out a display/rendering issue.