Feature/cms 13 upgrade

[drazenstankovic]

CMS 13 upgrade

[gemini-code-assist]

Code Review

This pull request upgrades the project to .NET 10 and Optimizely CMS 13, replacing legacy Dojo/Dijit widgets with native ES6 JavaScript modules, dropping the search-provider package, and cleaning up numerous unused sandbox features and blocks. Feedback on these changes highlights a malformed markdown link for the .NET Platform badge in the README and the use of a placeholder project GUID in the solution file.

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[sonarqubecloud]

Quality Gate passed

Issues
77 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud