🧹 Refactor: Remove any cast in catch block in app/karta/page.tsx

[marcin2121]

🎯 What: The code health issue addressed was using an unsafe error as any cast in the catch block of app/karta/page.tsx.
💡 Why: This improves maintainability and type safety by properly type-narrowing the error object using error instanceof Error instead of bypassing TypeScript checks with any.
✅ Verification: Verified by running npm run lint and npm run build to ensure no errors or build issues were introduced. Also requested code review which passed.
✨ Result: The codebase is now cleaner, safer, and follows better TypeScript typing practices without altering runtime functionality.

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PR created automatically by Jules for task 11405355949876712290 started by @marcin2121

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