Update the "Generate Excerpt" button to indicate when excerpt generation is in progress.

[iamdharmesh]

What?

Closes #380

Updates the “Generate Excerpt” button to say Generating... when excerpt generation is happening.

Why?

While we have a loading state on these buttons, updating the text makes it more clear and matches how we do things in other places.

How?

Updates the “Generate Excerpt” button to show Generating... while excerpt generation is in progress.

Use of AI Tools

N/A

Testing Instructions

1. Check out this PR branch and run npm i && npm run build.
2. Add a valid AI connector.
3. Turn on excerpt generation.
4. Create a post.
5. Find the Add an excerpt… button in the post status sidebar and click it to open the popover.
6. Click the Generate excerpt button in the popover.
7. Ensure the text updates to Generating....
8. Once the excerpt is generated, make sure the button updates to Re-generate excerpt.
9. Click it again and ensure the button text updates to Generating....

Testing Instructions for Keyboard

Screenshots or screencast

Screen.Recording.2026-04-09.at.10.51.25.AM.mov

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.75%. Comparing base (cf3f12a) to head (1cb9c5f).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #389   +/-   ##
==========================================
  Coverage      65.75%   65.75%           
  Complexity       763      763           
==========================================
  Files             53       53           
  Lines           3863     3863           
==========================================
  Hits            2540     2540           
  Misses          1323     1323           

Flag	Coverage Δ
unit	65.75% <ø> (ø)

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[dkotter]

We should probably apply these same changes to the inline button:

ai/src/experiments/excerpt-generation/components/ExcerptInlineButton.tsx

Lines 32 to 34 in cf3f12a

	const buttonLabel = hasExcerpt
	? __( 'Re-generate excerpt', 'ai' )
	: __( 'Generate excerpt', 'ai' );