chore: update next.js to version ^15.0.8 for sec vuln remediation

[sahansera]

This pull request updates the next dependency in the package.json file to ^15.0.8. This ensures the project benefits from the latest features, improvements, and security fixes provided by Next.js.

fixes: https://github.com/github/vuln-mgmt/issues/182845#issuecomment-3909829530

[Copilot]

Pull request overview

Updates the project’s Next.js dependency to the v15 line to address a security vulnerability, with corresponding lockfile updates to the resolved Next.js ecosystem packages.

Changes:

• Bump next dependency from ^14.2.35 to ^15.0.8 in package.json
• Update package-lock.json to reflect new resolved versions and transitive dependencies for Next 15

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 2 comments.

File	Description
package.json	Moves the app to Next.js v15 via the next dependency version bump.
package-lock.json	Updates the resolved Next.js version and transitive dependency graph (e.g., SWC packages, sharp-related optional deps, engine constraints).

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