Fix meta description loading state

[Deepam02]

What?

Closes #526

Updates the Meta Description button loading text to "Generating..." and removes the duplicate heading inside the modal.

Screenshots or screencast

Before

After

Recording.2026-05-08.235614.mp4

Use of AI Tools

AI assistance: Yes
Tool(s): Cursor
Model(s): Composer 2
Used for: pair programming.

Changelog Entry

Fixed - Updated Meta Description loading state and removed duplicate heading in modal.

[github-actions]

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Co-authored-by: Deepam02 <deepam02@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: jeffpaul <jeffpaul@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.07%. Comparing base (6a02fe2) to head (fb52a8a).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #527   +/-   ##
==========================================
  Coverage      70.07%   70.07%           
  Complexity      1107     1107           
==========================================
  Files             67       67           
  Lines           5367     5367           
==========================================
  Hits            3761     3761           
  Misses          1606     1606           

Flag	Coverage Δ
unit	70.07% <ø> (ø)

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[Deepam02]

/props-bot