fix: improve response handling by using a temporary file for markdown…

[Abourass]

This pull request refactors how the ask function in functions/ask.fish handles and stores AI responses. Instead of accumulating the response in a variable, it now streams the output to a temporary file, improving memory usage and reliability when handling large or streamed responses. The temporary file is cleaned up after use.

Response handling improvements:

• Streams each chunk of the AI response directly to a temporary file (response_file) instead of appending to the response_text variable, which is more efficient for large responses.
• Reads the full response from the temporary file into response_text after streaming, ensuring the complete response is available for further processing.

Resource management:

• Creates a temporary file at the start of the function to store the response and removes it at the end to prevent resource leaks. [1] [2]