Fix: MediaResolver invalid after dimensions change

[axww]

Related Ticket: https://github.com/tinymce/tinymce/issues/9798

Description of Changes:

• Run htmlToData again after dimensions changed to prevent custom MediaResolver rules invalid.

Pre-checks:

• [x] Changelog entry added
• [x] Tests have been added (if applicable)
• [x] Branch prefixed with feature/, hotfix/ or spike/

Review:

• [x] Milestone set
• [x] Docs ticket created (if applicable)

GitHub issues (if applicable): https://github.com/tinymce/tinymce/issues/9798

Summary by CodeRabbit

• Bug Fixes
  • Improved the media embed functionality to ensure proper synchronization between embed content and generated HTML, resulting in more reliable embed handling in the editor.

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Walkthrough

The media plugin's Dialog component now conditionally enriches data with a source extracted from embed HTML during dialog updates. When an embed value exists, the source is derived via HtmlToData conversion before passing to dataToHtml; otherwise, the original data is used.

Changes

Cohort / File(s)	Summary
Media Dialog Embed Enrichment modules/tinymce/src/plugins/media/main/ts/ui/Dialog.ts	Added conditional logic to enrich data with source extracted from embed HTML (via HtmlToData.htmlToData) when computing embed HTML during dialog updates.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

• Understanding the purpose of source enrichment from embed HTML and verifying it doesn't introduce unintended side effects on the embed generation flow
• Confirming the conditional logic correctly handles both truthy and falsy embed values

Pre-merge checks

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Fix: MediaResolver invalid after dimensions change' directly matches the PR's stated objective of fixing MediaResolver becoming invalid after dimension changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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[axww]

Submit this PR again due to long time hold. Please check my issue which reproduced this bug: https://github.com/tinymce/tinymce/issues/9798 Need your help with changelog, I'm not familiar with it. Please review, many thanks!!