chore: remove regenerator-runtime dependency and update react-intersection-observer to 9.11.0 (#3247)

## Remove regenerator-runtime dependency

### Summary
Removes obsolete `regenerator-runtime` dependency that's no longer
needed with our modern Vite + ESNext build setup.

### Changes
- ❌ Remove `regenerator-runtime` dependency and import
- ⬆️ Update `react-intersection-observer` to `^9.11.0`

### Why?
- Our TypeScript targets `ESNext` and browserslist targets modern
browsers
- Vite handles necessary polyfills automatically  
- No generator functions used in codebase
- Modern browsers support async/await natively

### Impact
- Smaller bundle size
- One less dependency to maintain
- No breaking changes

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- New Features
  - No user-facing features added.
- Refactor
  - Removed legacy polyfill import to streamline app initialization.
- Chores
  - Upgraded react-intersection-observer to ^9.11.0.
  - Removed regenerator-runtime dependency to reduce bundle overhead.
- Impact
  - Slightly faster startup and smaller bundle size.
  - No changes to public APIs or user workflows.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: dzienisz

webapp/package-lock.json

@@ -45,15 +45,14 @@
     "react-google-recaptcha-v3": "1.9.5",
     "react-gtm-module": "^2.0.11",
     "react-helmet": "^6.1.0",
-    "react-intersection-observer": "^9.10.1",
+    "react-intersection-observer": "^9.11.0",
     "react-list": "^0.8.17",
     "react-markdown": "^8.0.4",
     "react-qr-code": "^2.0.7",
     "react-query": "^3.39.3",
     "react-router-dom": "^5.2.0",
     "recharts": "2.1.9",
     "reflect-metadata": "^0.1.13",
-    "regenerator-runtime": "^0.13.9",
     "sockjs-client": "^1.6.1",
     "use-context-selector": "^1.3.9",
     "use-debounce": "^10.0.0",

webapp/package.json

@@ -14,7 +14,6 @@ import { QueryClientProvider } from 'react-query';
 import { BrowserRouter } from 'react-router-dom';
 import { SnackbarProvider } from 'notistack';
 import 'reflect-metadata';
-import 'regenerator-runtime/runtime';
 
 import { GlobalLoading, LoadingProvider } from 'tg.component/GlobalLoading';
 import { GlobalErrorModal } from 'tg.component/GlobalErrorModal';