[Bot] #11 fix: prompt text box width

[freepilot-bot]

commit a89c3ed
Author: freepilotbot 215356755+freepilot-bot@users.noreply.github.com
Date: Sun Jun 8 23:20:38 2025 +0700

Fix prompt text box width issue by removing flex layout

- Replace flex layout with vertical stacking for prompt section
- Move prompt label and copy button above the text area instead of beside it
- Remove flex-grow constraint that was causing text area to become too wide with long sentences
- This prevents the text box from expanding beyond container boundaries when prompt text is lengthy

Fixes: prompt text area becoming too wide with long sentences