chore: update next.js demo and resolve issue in result of recent nextjs version upgrade

[petar-i-todorov]

refs #344

[Copilot]

Pull request overview

This PR updates the Next.js Telerik Reporting demo to resolve compatibility issues introduced by recent Next.js version upgrades. The changes implement dynamic imports with SSR disabled for the Telerik Report Viewer component and update the Kendo UI theme CDN links to the latest version.

Key Changes:

• Implemented dynamic import with SSR disabled for the TelerikReportViewer component to ensure client-side-only rendering
• Updated Kendo UI theme CDN links from version 2022.3.913 to themes/12.0.0 with the classic-opal theme
• Upgraded @progress/telerik-react-report-viewer package from version ^24.24.1218 to ^28.25.1119

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
nextjs-telerik-rv-example/src/app/page.js	Implements dynamic import for TelerikReportViewer with SSR disabled and updates Kendo UI theme CDN references
nextjs-telerik-rv-example/package.json	Updates telerik-react-report-viewer dependency to version ^28.25.1119

Files not reviewed (1)

• nextjs-telerik-rv-example/package-lock.json: Language not supported

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 3 changed files in this pull request and generated no new comments.

Files not reviewed (1)

• nextjs-telerik-rv-example/package-lock.json: Language not supported

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[petar-i-todorov]

Our example is not really compatible with https://demos.telerik.com/reporting/api/reports/ as of now, since the demos REST service relies on version 1203, which is not publicly available.

That said, I tested with a local 1119 service, and it seemed to be working as expected (ignore the error, I was too lazy to add a report to the service):

[ighristov]

no idea what does this line do :)

[ighristov]

Thanks for fixing it, Pepi!