Update node types

[achamayou]

Replaces #7530

[Copilot]

Pull request overview

This PR updates the Node.js type definitions from version 24.2.0 to 25.0.2 and adapts the codebase to accommodate breaking changes in the crypto module's type definitions.

• Updates @types/node dependency to version 25.0.2
• Replaces references to jscrypto.JsonWebKey with the custom JsonWebKey type defined in the project
• Adds type casts to handle type incompatibilities introduced by the Node.js types update

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
js/ccf-app/package.json	Updates @types/node from v24.2.0 to v25.0.2
js/ccf-app/src/polyfill.ts	Imports JsonWebKey type, replaces jscrypto.JsonWebKey references with custom JsonWebKey type, and adds as any casts to key.export() calls to work around type changes