Fix canceled meta description suggestion state

[ekamran]

What?

Fix the Meta Description modal so a canceled regenerated suggestion does not appear when reopening the modal through “Edit description”.

Why?

When a post already had a saved meta description, regenerating a new suggestion and canceling it left that suggestion in component state.

After that, reopening “Edit description” could show the canceled suggestion in the textarea instead of the saved meta description shown in the sidebar.

How?

The panel now tracks whether the modal is opened for editing the saved description or for generating a suggestion.

Suggestions are only passed into the modal while it is in generate mode, and stale suggestion state is cleared when leaving the modal.

Testing Instructions

Automated checks run locally:

npm run lint:js -- src/experiments/meta-description/components/useMetaDescription.ts src/experiments/meta-description/components/MetaDescriptionPanel.tsx tests/e2e/specs/experiments/meta-description.spec.js
npm run typecheck
npm run build
WP_BASE_URL=http://localhost:8888 npm run test:e2e -- tests/e2e/specs/experiments/meta-description.spec.js

Manual verification:

1. Open a post with a saved meta description.
2. Click “Regenerate meta description”.
3. Wait for the generated suggestion.
4. Click “Cancel”.
5. Click “Edit description”.
6. Confirm the modal textarea shows the saved meta description, not the canceled suggestion.

Screenshots/Screencast

Before:

After:

Use of AI Tools

AI assistance: Yes
Tool(s): ChatGPT / Codex
Used for: Repository review, reproduction planning, implementation guidance, test updates, and local verification. I reviewed the changes, tested the behavior locally, and take responsibility for the final submission.

[github-actions]

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Co-authored-by: ekamran <ekamran@git.wordpress.org>
Co-authored-by: dkotter <dkotter@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.57%. Comparing base (64e8032) to head (534bcca).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #653   +/-   ##
==========================================
  Coverage      74.57%   74.57%           
  Complexity      1754     1754           
==========================================
  Files             85       85           
  Lines           7548     7548           
==========================================
  Hits            5629     5629           
  Misses          1919     1919           

Flag	Coverage Δ
unit	74.57% <ø> (ø)

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