Make the stop generation button visible during model response.

[manyoso]

This ensures that it is always clear when the response is still being generated and it also makes it easier to stop generation. Seems like a decent solution?

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:rocket:	This description was created by Ellipsis for commit 4fdab841788160d72aadf56699292a88773694dd

Summary:

Moved the stop generation button to a more prominent location and ensured its visibility during response generation in gpt4all-chat/qml/ChatView.qml, with theme property updates in gpt4all-chat/qml/Theme.qml.

Key points:

• Modified gpt4all-chat/qml/ChatView.qml to move the stopButton outside the conversation tray and make it always visible during response generation.
• Updated stopButton visibility conditions to currentChat.responseInProgress && !currentChat.isServer.
• Renamed theme properties in gpt4all-chat/qml/Theme.qml:
  • sendButtonBackground to conversationInputButtonBackground
  • sendButtonBackgroundHovered to conversationInputButtonBackgroundHovered.
• Ensured stopButton is more accessible and easier to use during response generation.

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