Update/screencasts

[jeffpaul]

What?

This PR adds in screencasts for the new features in 0.4.0. Assuming this is good to go, I'll look to port the same changes directly to SVN (as we don't yet have the readme updater action in place here).

Copilot summary

This pull request updates the feature list in the readme.txt file to better reflect the current AI capabilities and user interface flows. The changes reorganize and expand the descriptions of available features, especially around image generation and review notes.

Feature list updates:

• Added descriptions for "Generate Image" flows in both the post editor and media library, clarifying where image generation features are accessible.
• Introduced a new item describing "Generate Review Notes" flows in the post editor sidebar, highlighting this additional AI-powered feature.
• Moved and expanded the "Generate Alt Text" feature to the image block settings, specifying its location and functionality.

General improvements:

• Renumbered and reorganized the list to accommodate new features and ensure clarity for users reviewing the plugin's capabilities.

Why?

How?

Use of AI Tools

None, all human demos generated.

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: jeffpaul <jeffpaul@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.

[dkotter]

This screenshot could be updated to show the latest settings UI where we have broken Experiments into two categories

[jeffpaul]

Updated in c4658e8.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.72%. Comparing base (9e88ddc) to head (4ff94a9).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #281   +/-   ##
==========================================
  Coverage      57.72%   57.72%           
  Complexity       567      567           
==========================================
  Files             36       36           
  Lines           2933     2933           
==========================================
  Hits            1693     1693           
  Misses          1240     1240           

Flag	Coverage Δ
unit	57.72% <ø> (ø)

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