fix: match size with the output

[weilirs]

Updated:

[greptile-apps]

PR Summary

Changed the ConversationHistory component's container height property to maxHeight for improved responsive behavior when content is smaller than the maximum size.

• Modified style property in /src/components/WritingAssistant/ConversationHistory.tsx from fixed height to maxHeight for better container flexibility
• Container now properly shrinks with less content while maintaining the upper size boundary
• Scrolling behavior remains intact with existing overflow-y-auto class

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[weilirs]

also fixate the size of the writing assistant's window to avoid it being too large and overflow like