fix(hooks): add error handler to useSSE

[Tmalone1250]

Closes Issue #44

Summary

• Added an error event listener to the EventSource instance in the useSSE hook (src/hooks/useSSE.ts).
• Logs SSE connection errors to the console (console.error) to prevent silent failures and aid in debugging.

Why

SSE connection failures were previously unhandled, making it difficult for developers to diagnose connectivity issues and leaving users unaware of why live updates might have stopped. This fix ensures that errors are at least surfaced in the console.

Test plan

• Verified via reproduce_issue_44.test.tsx that the error listener is correctly registered during hook initialization.
• Build check: npm run build (including tsc -b) - SUCCESS.
• Manual check: Simulated network disconnection in the browser and confirmed the SSE connection error message appears in the console.

Attachments

pre_fix_failure.log
post_fix_success.log