Add new field "fix grammar" in Content Resizing Features.

[turtlepod]

Description of the Change

This PR adds a new "Fix grammar and spelling" option to the Content Resizing feature. Users can now correct spelling errors and grammatical mistakes in paragraph blocks directly from the block editor toolbar, alongside the existing "Expand this text" and "Condense this text" options.

See Issue #820

Key Changes:

• Added fix_grammar_prompt property and default prompt to ContentResizing feature class
• Added new settings field "Fix grammar and spelling" in the feature settings UI
• Updated REST API endpoint to accept fix_grammar as a valid resize_type parameter
• Added "Fix grammar and spelling" menu item to paragraph block toolbar controls
• Updated all provider implementations (OpenAI ChatGPT, Azure OpenAI, Google AI Gemini, xAI Grok, Chrome AI, and Ollama) to handle the new fix_grammar resize type
• Updated JavaScript/React components to handle the new feature, including modal titles and state management

Benefits:

• Provides users with a quick way to improve content quality directly within the editor
• Maintains consistency with existing expand/condense functionality
• Supports all existing AI providers without requiring additional configuration
• Uses customizable prompts, allowing users to tailor the grammar correction behavior

Verification Steps:

1. Navigate to ClassifAI → Language Processing → Content Resizing settings
2. Verify the new "Fix grammar and spelling" prompt field appears alongside existing prompt fields
3. Enable the Content Resizing feature and select a provider
4. Create or edit a post with paragraph blocks containing intentional spelling/grammar errors
5. Select a paragraph block and click the AI icon in the toolbar
6. Verify "Fix grammar and spelling" option appears in the dropdown menu
7. Click "Fix grammar and spelling" and verify the modal opens with corrected suggestions
8. Test that the feature works with all supported providers (OpenAI, Azure OpenAI, Google AI, xAI Grok, Chrome AI, Ollama)

Issue #820

How to test the Change

1. Backend Settings:

   • Go to WordPress admin → ClassifAI → Language Processing → Content Resizing
   • Verify the feature can be enabled and a provider selected
   • Verify the new "Fix grammar and spelling" prompt field appears in the settings
   • Save settings with a custom prompt and verify it persists

2. Block Editor Integration:

   • Create a new post or edit an existing one
   • Add a paragraph block with intentional spelling/grammar errors (e.g., "This is a test sentance with erors.")
   • Select the paragraph block
   • Click the AI icon (🤖) in the block toolbar
   • Verify three options appear: "Expand this text", "Condense this text", and "Fix grammar and spelling"
   • Click "Fix grammar and spelling"
   • Verify a modal opens showing grammar-corrected suggestions
   • Select a suggestion and verify it replaces the original content

3. Provider Compatibility:

   • Test with each supported provider (OpenAI ChatGPT, Azure OpenAI, Google AI Gemini, xAI Grok, Chrome AI, Ollama)
   • Verify grammar correction works consistently across all providers
   • Verify error handling works if a provider is unavailable or misconfigured

4. Edge Cases:

   • Test with empty paragraph blocks
   • Test with very long paragraphs
   • Test with paragraphs containing special characters or HTML entities
   • Test with multiple paragraph blocks selected (feature should be disabled)
   • Verify permissions are properly checked (users without edit_post capability cannot use the feature)

Changelog Entry

Added - New feature
Changed - Existing functionality
Deprecated - Soon-to-be removed feature
Removed - Feature
Fixed - Bug fix
Security - Vulnerability
Developer - Non-functional update

Added - "Fix grammar and spelling" option to Content Resizing feature, allowing users to correct spelling and grammatical errors directly from paragraph block toolbar

Credits

Props @davidchandra

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

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[peterwilsoncc]

This is testing well.

It would be good to have some E2E tests added for the sub-feature for each of the providers.

The feature has tests in the files tests/cypress/integration/language-processing/resize_content-[provider name].test.js using the mocked response in tests/test-plugin/resize-content.json.

Tests aside, the code looks good. Thank you.

[dkotter]

Apologies for not adding a comment on this but Jeff and I discussed this PR during our UAT yesterday and before we proceed more on this PR, there needs to be a decision on where best this particular functionality (grammar fixing) belongs. Right now this is added as part of the Content Resizing Feature and not sure that makes the most sense. Also not sure if it's a big enough feature to be a "stand-alone" Feature.

Worth some discussion on the best approach for this and any other content-type manipulations (think spell check, tone change, clarification, etc).

[turtlepod]

@dkotter I agree—it feels a bit misplaced in the content resizing section. I think creating a new section called “Content Manipulation” would make more sense.

[dkotter]

@dkotter I agree—it feels a bit misplaced in the content resizing section. I think creating a new section called “Content Manipulation” would make more sense.

Yeah, I think lots of options to consider here: Content Generation, Copywriting, Content Editing, probably many others. I think we need to figure that part out but also figure out what types of features should live within that bucket (both in terms of existing Features and new Features we may add in the future)

[jeffpaul]

Perhaps rename "Content Resizing" to "Text Transformations" or "Authoring Tools" or "Writing Tools" that then includes Expand, Condense, Fix grammar (and potentially later Clarify, Professionalize, Summarize, Bulletize, whatever)?