- Added condition to check if `action.payload.hasDone` is true, then update the hash of the last two messages in `state.messages`.
- Fixed the `splice` method in `deleteMessage.fulfilled` to correctly remove the message from `state.messages`.
- Updated `stopGenerating` dispatch in `ChatPanel.tsx` to include the message in the payload.
- Modified the delete message action in `MessageHeader.tsx` to handle the case when `item.hash` is not present.
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