[BUG]: Fix input validation and prevent unnecessary API calls in Text_Input.jsx

[Adilkhan6465]

Bug Description

Problem

The Text_Input component allows API calls even when the input is invalid or incomplete:

• Clicking "Next" without entering text or URL still triggers processing
• Invalid or empty Google Doc URLs may lead to unintended API calls
• Number of questions can be set to 0, which should not be allowed
• Error handling is inconsistent for file uploads and API failures
• Unused state variables add unnecessary clutter to the component

Expected Behavior

• API calls should only be made when valid input is provided
• Either text input, file upload, or a valid Google Doc URL must be present
• Number of questions must be greater than 0
• Errors should be clearly displayed to the user
• Code should not contain unused state or redundant logic

Proposed Solution

• Add validation to prevent empty input submission
• Prevent API calls when question count is 0
• Improve handling of Google Doc URL responses
• Handle file upload errors more safely
• Remove unused state variables to clean up the code

Steps to Reproduce

No response

Logs and Screenshots

No response

Environment Details

No response

Impact

Critical - Application is unusable

Code of Conduct

• I have joined the Discord server and will post updates there
• I have searched existing issues to avoid duplicates