Add toggle_label field to AnalysisCardBase for custom subtitle expansion text (#5124)

[shrutipatel31]

Summary:

Adds a serializable toggle_label: str field to AnalysisCardBase that allows
analyses to customize the subtitle expand/collapse toggle button text.

When non-empty, toggle_label replaces the default "See more" text with
a context-specific label (e.g., "Expand to see annotated parameters.").
The field is persisted to both SQA and JSON storage backends, and used by
the notebook HTML template for rendering.

Changes:

• Add toggle_label field + constructor param (default "") to AnalysisCardBase
• Update notebook _to_html() to use self.toggle_label or "See more"
• Add toggle_label nullable column to SQAAnalysisCard
• Update SQA encoder/decoder (all 8 card-type callsites)
• Update JSON encoder for both card and group dicts
• Unit tests

Reviewed By: bernardbeckerman

Differential Revision: D98738752

[meta-codesync]

@shrutipatel31 has exported this pull request. If you are a Meta employee, you can view the originating Diff in D98738752.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.44%. Comparing base (f3e8831) to head (4feedc6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5124      +/-   ##
==========================================
+ Coverage   96.42%   96.44%   +0.02%     
==========================================
  Files         618      618              
  Lines       68921    68971      +50     
==========================================
+ Hits        66457    66521      +64     
+ Misses       2464     2450      -14     

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