* get `stop()` from useChat and use it
* Implement abort signal in `generate-v4` API
* Enhance `onStop` functionality in AIAssistant to store partial message when aborted
* Update dependencies in AIAssistant to include `updateMessage` in effect hook (lint warning fix)
* change onStop prop to be required in AssistantChatForm
* add comment for saving partial AI responses
* remove redundant text size class
* Make onStop prop optional in AssistantChatForm and conditionally render stop button
* Add loading spinner to stop button in AssistantChatForm
* simplify opacity handling for submit button
* Add tooltips
* Improve UI error handler for assistant panel
* Small tweak
* Filter out any tool calls that are streaming in generate-v4, happens when aborting the assistant while a tool is being called
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Co-authored-by: Joshen Lim <joshenlimek@gmail.com>
