Add follow-up questions feature to AI chat

[Muskan244]

Closes #12243

This PR implements a follow-up questions feature to AI chat. After the AI responds to a user's question, the system automatically generates 3-5 relevant follow-up questions that appear as clickable links below the chat.
Changes:

• Added new "Generate follow-up questions" setting in AI preferences
• Created FollowUpQuestionGenerator class to generate questions via AI
• Integrated follow-up generation into AiChatLogic after each AI response
• Added UI component to display clickable follow-up question links
• Questions are cleared when any new message is sent

Steps to test

1. Go to Preferences → AI, enable AI with API key, and check "Generate follow-up questions"
2. Open an entry with a PDF attached and click the "AI chat" tab
3. Send a question and verify that 3-5 clickable follow-up questions appear below the chat
4. Click a follow-up question and verify it sends automatically and new questions appear
5. Disable the setting in preferences and verify no follow-up questions appear

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• I manually tested my changes in running JabRef (always required)
• [/] I added JUnit tests for changes (if applicable)
• I added screenshots in the PR description (if change is visible to the user)
• I described the change in CHANGELOG.md in a way that is understandable for the average user (if change is visible to the user)
• [/] I checked the user documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request updating file(s) in https://github.com/JabRef/user-documentation/tree/main/en.

[ThiloteE]

1. Things I would like you to address in this PR:
   I tried generating follow up questions and it simply works. Great job!
   Only one tiny thing is amiss: I think you should limit the number of follw up questions to three (or maybe add a preference that lets users choose the number and set the default to three). As you can see the questions may be too long for the GUI:
   

2. Possible follow up PR:
   Since we have a user base that does not only speak English, it would be good to expose this instruction as a template in the AI preferences, so that every user can manually translate this instruction to their own language, Here:
   
   Maybe far in the future, we can make it dependent on the set user language, but that's a long shot.

[InAnYan]

What would anyone think about this:

I think there are too many buttons for questions. What if we could hide "Try these examples" as soon as there are follow up questions?

[InAnYan]

Okay, good! But the follow up questions template must be an AiTemplate

[Muskan244]

1. Things I would like you to address in this PR:
   I tried generating follow up questions and it simply works. Great job!
   Only one tiny thing is amiss: I think you should limit the number of follw up questions to three (or maybe add a preference that lets users choose the number and set the default to three). As you can see the questions may be too long for the GUI:

I will limit the number of generated follow-up questions to three by default and will try to add the preference for users too.

2. Possible follow up PR:
Since we have a user base that does not only speak English, it would be good to expose this instruction as a template in the AI preferences, so that every user can manually translate this instruction to their own language, Here:

I would be happy to look into adding this in a follow-up PR.

[Muskan244]

Okay, good! But the follow up questions template must be an AiTemplate

Thanks, I will update the follow-up questions to use an AiTemplate instead of the current inline string.

[Muskan244]

I have implemented these changes:

• Limited the number of generated follow-up questions to three by default
• Added a user preference to customize this limit
• Converted the follow-up questions instruction into an AiTemplate

What would anyone think about this:

I think there are too many buttons for questions. What if we could hide "Try these examples" as soon as there are follow up questions?

I have not worked on this part yet. If you would like me to include it in this PR, please let me know and I will be happy to update it.

[Muskan244]

I have implemented these changes:

• Replaced the number text field with a JavaFX Spinner
• Added tooltip on follow-up questions to view full text
• Updated wording to include “Automatically”, and chained bindings
• Replaced Platform.runLater with UiTaskExecutor.runInJavaFXThread
• Removed unnecessary comments

Let me know if anything else is needed!

[InAnYan]

Codewise looks okay

[InAnYan]

Please change the UI in settings like this:

1. Remove the word Automatically. Just Generate follow-up questions
2. And when the checkbox is not ticked, please disable the number input component, and, if possible, gray out the label "Number of follow-up questions"

The button Reset current template for follow-up questions template doesn't work.

Another UI changes:

Can you please add colons to Try with examples (Try with examples:) and the same for follow-up questions?

And when there are follow-up questions, can you hide the HBox with example questions?

[InAnYan]

But overall, it looks great! Thank you!

[InAnYan]

• Isn't there a JavaFX element for increasing and decreasing numbers?

  • Should we add "Automatically" at the new bullet point? - To be consistent to the other two settings?

Replying to @koppor .

I think Automatically doesn't make sense. The reason why I introduced previous 2 options is because before one should've manually click "Generate summary" or "Embeddings".

Generation of follow-up questions already implies that they are generated automatically.

Though... maybe I was wrong with the wording "Automatically generate embeddings". Need to dive more

[InAnYan]

I tested more, and found that hover is also available. Cool!

[Muskan244]

And when there are follow-up questions, can you hide the HBox with example questions?

I just want to clarify whether this should be done in this PR or in a separate PR, because @koppor commented earlier:

I think there are too many buttons for questions. What if we could hide "Try these examples" as soon as there are follow up questions?

I have not worked on this part yet. If you would like me to include it in this PR, please let me know and I will be happy to update it.

Very OK for me to do that in a separate PR.

If I am mixing up two different things, please let me know.

[InAnYan]

Ah, sorry, now I understand your confusion.

But, IMHO, the review comments that are left are one-liners, so I think it's not hard to incorporate them in this PR

[Muskan244]

Ah, sorry, now I understand your confusion.

But, IMHO, the review comments that are left are one-liners, so I think it's not hard to incorporate them in this PR

Thanks for the clarification. I'll add it in this PR.

[koppor]

I have not worked on this part yet. If you would like me to include it in this PR, please let me know and I will be happy to update it.
Very OK for me to do that in a separate PR.
If I am mixing up two different things, please let me know.

I mis-read your question. Please include it here.

[Muskan244]

I have implemented these changes:

• Removed “Automatically” and now it is “Generate follow-up questions”
• Disabled the number input and grayed out the label when the checkbox is unchecked
• Fixed the “Reset current template" button for follow-up questions
• Added colons to “Try with examples:” and “Follow-up questions:”
• Hid the example questions HBox when follow-up questions are displayed

Let me know if anything else is needed!

[koppor]

During generation, the "try with examples" are still shown. Why? -- I think, it should not.

[Muskan244]

During generation, the "try with examples" are still shown. Why? -- I think, it should not.

Thanks for pointing it out, currently I hide “Try with examples” only when follow-up questions are displayed. When a new message is sent, the follow-up list is cleared in preparation for generating new ones, so the examples reappear during generation.
I’ll update the logic so that “Try with examples” stays hidden while the model is generating follow-up questions as well.