feat: add AI Chart Creation

[HardeepAsrani]

Summary

This PR adds an AI wizard to Visualizer.

• Adds an AI-powered chart builder alongside the classic wizard, with a chooser modal for new charts.
• Introduces a React-based AI Builder flow with data import, prompt presets, reference image support, and D3 live preview.
• Supports D3 rendering + PNG export, plus fullscreen preview and manual code editing.
• Unifies data import (CSV/URL/JSON/DB) using existing source classes and improves error handling.
• Adds optional data extraction flow (CSV) when requested from reference images.

Will affect visual aspect of the product

YES/NO

Screenshots

Test instructions

• Make sure all the features work.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/visualizer-pro/issues/577, https://github.com/Codeinwp/visualizer-pro/issues/571.

[pirate-bot]

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