Update subtitle rendering in notebook Analysis Cards (#5112)

[shrutipatel31]

Summary:

Matches the web UI change from D97406631 for notebook (Jupyter/Bento) rendering of Ax analysis cards.

Before: Subtitles were hidden behind a clickable

/

element with an info icon - users had to click to reveal the subtitle text.

After: Subtitles are now shown as visible, secondary-styled text directly beneath the title, line-clamped to a single line. A "See more"/"See less" toggle appears automatically when the subtitle text overflows, allowing users to expand and collapse the full text.

Key changes to html_card_template in analysis_card.py:

• Replaced
  /

  with always-visible

  using CSS -webkit-line-clamp: 2

• Added a "See more"/"See less" toggle that is shown only when the subtitle is actually clamped (detected via scrollHeight > clientHeight in a requestAnimationFrame callback)
• The inline script uses document.currentScript.previousElementSibling to locate its sibling card element and querySelector to find the subtitle and toggle within it, avoiding the need for unique DOM IDs or any Python-side bookkeeping
• Removed the info icon CSS (content: "ℹ️") and hover-to-reveal interaction

Differential Revision: D98690381

[meta-codesync]

@shrutipatel31 has exported this pull request. If you are a Meta employee, you can view the originating Diff in D98690381.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.40%. Comparing base (bdcfdbe) to head (590fc2e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5112      +/-   ##
==========================================
- Coverage   96.40%   96.40%   -0.01%     
==========================================
  Files         613      613              
  Lines       68142    68142              
==========================================
- Hits        65694    65693       -1     
- Misses       2448     2449       +1     

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