Prevent Duplicate Links to Disable Title Generation

[faisal-alvi]

Description of the Change

This PR fixes a bug in the Classic Editor where the "Disable this ClassifAI feature" link for Title Generation was appearing multiple times in the popup when users generated titles repeatedly.

1. JavaScript Fix: Added $( '.classifai-title-generation__result-disable-link' ).remove(); before generating new titles to clear any existing disable links
2. CSS Fix: Added specific styling for the title generation disable link with proper padding to prevent it from touching the left edge and bottom of the modal

before

after

Closes #982

How to test the Change

1. Enable Title Generation Feature:

   • Go to Tools > ClassifAI > Language Processing > Title Generation > Settings
   • Configure the feature with a valid API provider
   • Ensure user-based opt-out is enabled

2. Test Classic Editor:

   • Create or edit a post in Classic Editor
   • Click "Generate titles" button multiple times (2-3 times)
   • Verify that only one "Disable this ClassifAI feature" link appears in the popup
   • Verify the link has proper spacing (20px padding on left and bottom)

3. Test Block Editor:

   • Create or edit a post in Block Editor
   • Use the Title Generation feature multiple times
   • Verify no regression in Block Editor functionality

Changelog Entry

Fixed - Prevent duplicate "Disable this ClassifAI feature" links in Classic Editor Title Generation popup

Credits

Props @iamdharmesh @faisal-alvi

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.