Fix: Merge qaPairs for 'all type' questions to avoid forEach error (#221)

[ts-31]

Summary:
This pull request fixes the "forEach" error that occurs when generating "all type" questions. The error was caused by the code trying to iterate over a non-existent "output" key in the qaPairs data from localStorage.

What Was Changed:

• Modified the useEffect hook to explicitly merge data from the keys "output_boolq", "output_mcq", and "output_shortq" when the question type is "all type".
• Added proper checks to ensure that each key exists and is an array before calling .forEach.

Testing:

• Tested locally by generating questions with the "all type" option.
• Verified that no error is thrown and that questions from all types are merged correctly.

Closes #221

[Aditya062003]

Hey, I believe this issue is already being worked on!