AI Test Search and Suggest Update

[pengyin-shan]

This PR is for #434 and #439. It updates the suggestion scoring system to include more results and introduces the trial version of the LLM-based search experience. Additionally, it incorporates layout adjustments following the latest design changes and fixes several minor bugs.

How to Test

1. Navigate to the search page. The keyword search should be the default mode:

2. Test the suggestion dropdown behavior: Start typing in the keyword search field. The suggestion dropdown should now correctly overlap the Geo search box on the map, fixing a previous issue:

3. Verify keyword search functionality: Perform various searches to confirm that keyword search still works as expected:

4. Switch to AI-based search mode: Click the "Chat" button to switch to AI search:

5. Test AI-based search: Type a question (e.g., "What is the greenspace condition in Champaign, IL?") and search.
   While searching, the mode switch, search, and clear buttons should be temporarily disabled to prevent conflicts caused by multiple triggered searches:

6. Review AI search results: You should now see the AI-generated results:

7. Switch back to keyword search: You can return to keyword search mode and test functionality as needed.

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[mradamcox]

@pengyin-shan based on the latest demo, I have some thoughts about the map integration. To me, the ideal solution to the location/bbox search is not to have ChatGPT generate the Solr params for this (as you currently have it), but instead to have the ChatGPT results trigger a selection in the geocoding widget, assuming that is possible. That would take care of selecting the place in the map, zooming to it, and adding the bbox filter, instead of short-circuiting straight to the solr query, like the current setup. Do you think that is something you could explore before we merge this? Just wanted to put the idea out there.

[mradamcox]

Overall, this is really cool, and looking really good. I'm sure we'll have some design changes to make, and more to do on the map integration, but it's in plenty good enough shape to merge into our development branch now.