Add changelog entry for entity widgets with Material 3 settings

[jpelgrom]

Summary

Adds a changelog entry for #7007. The sentence can be adjusted with more widget types if we merge more before the next release.

Checklist

• New or updated tests have been added to cover the changes following the testing guidelines.
• The code follows the project's code style and best_practices.
• The changes have been thoroughly tested, and edge cases have been considered.
• Changes are backward compatible whenever feasible. Any breaking changes are documented in the changelog for users and/or in the code for developers depending on the relevance.
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[Copilot]

✅ Ready to approve

The change is a straightforward, well-formed changelog entry with no apparent structural or formatting issues.

Note: this review does not count toward required approvals for merging.

Pull request overview

Adds a user-facing changelog note for the companion app’s “Main” release track to reflect the recent modernization of entity widget settings (per the context of PR #7007 migrating configuration UI to Material 3 / Compose).

Changes:

• Add a new changelog entry: “Modernized settings for entity widgets” under 2026.7.6 - Main.

File summaries

File	Description
app/src/main/res/xml/changelog_master.xml	Adds a release note describing the updated entity widget settings experience.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Low

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[jpelgrom]

I guess a similar entry could actually be added for the tile settings 🤔

(difference isn't as big though as those were already using Material 2 components)