Runtime errors

[exacs]

This PR:

• Adds the property name in all thrown errors to show the class name instead of Error
• Adds an error page in hello-world sample site. (Note: package must be bumped in sample site, will be done in a separate PR)
• Removes console.log from runtime

[Copilot]

Pull request overview

This PR improves error handling and debugging in the Optimizely CMS SDK by adding explicit error names, demonstrating error handling patterns, and cleaning up runtime logging.

• Sets explicit name property on all custom error classes to display the class name instead of generic "Error"
• Adds an error page component to the hello-world sample demonstrating error handling with instanceof checks
• Removes development-time console.log from runtime component rendering

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/optimizely-cms-sdk/src/graph/error.ts	Adds name property to all 5 custom error classes for better error identification
packages/optimizely-cms-sdk/src/react/server.tsx	Removes console.log for missing components; fallback UI already provides visual feedback in dev mode
samples/hello-world/src/app/error.tsx	New Next.js error boundary demonstrating specific error type handling using instanceof checks

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