Fix meta description no-provider modal

[ekamran]

What?

Prevents the Meta Description modal from opening when no AI provider is configured.

Why?

When clicking Generate Meta Description without a configured AI Connector, the plugin correctly shows the provider warning. However, the Meta Description modal also opened even though generation could not proceed.

This made the UI feel inconsistent with the other no-provider flows, where the user only sees the provider notice and is directed to configure a connector.

How?

• Checks provider availability before opening the Meta Description modal for generation.
• Keeps the existing provider warning and Manage Connectors action.
• Keeps manual editing unchanged when a meta description already exists.
• Updates the existing no-provider E2E test to confirm the modal does not open.

Use of AI Tools

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

Testing Instructions

1. Ensure no AI Connector API key is configured.
2. Enable AI features and the Meta Description Generation experiment.
3. Open a new post in the block editor.
4. Expand the Meta Description panel.
5. Click Generate Meta Description.
6. Confirm the provider warning appears with a Manage Connectors link.
7. Confirm the Meta Description modal does not open.

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/no-provider-degradation.spec.js
• npm run typecheck
• npm run test:e2e -- tests/e2e/specs/experiments/no-provider-degradation.spec.js

Screenshots or screencast

Before

No provider is configured. The warning appears, but the Meta Description modal also opens even though generation cannot proceed.

After

No provider is configured. The same warning appears, but the Meta Description modal stays closed.

[github-actions]

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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.21%. Comparing base (7888332) to head (9a3aa0c).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #558   +/-   ##
==========================================
  Coverage      71.21%   71.21%           
  Complexity      1151     1151           
==========================================
  Files             67       67           
  Lines           5565     5565           
==========================================
  Hits            3963     3963           
  Misses          1602     1602           

Flag	Coverage Δ
unit	71.21% <ø> (ø)

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