Add manual retry option for failed prompts

Problem

When an error occurs (such as from connectivity issues, OpenAI APIs, or function calls) there’s currently no clear way to recover. To retry, users have to re-enter the same prompt or quit the session and start over from the beginning.

Solution

When an error occurs (regardless of its type) the app should give users the option to manually retry the last prompt, whether it was a system prompt or a user prompt.

Additional context

No response

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