chore(deps): upgrade to React 19, react-dom 19, lucide-react v1, helmet v8 (v0.11.11 Beta)

- React + @types/react bumped to v19 (merged Dependabot PRs #22, #23, #25)
- react-dom + @types/react-dom aligned to v19 (PR #26 had conflicts; applied manually)
- lucide-react upgraded from 0.309 → 1.16 to satisfy React 19 peer deps (no API changes for our icon usage pattern)
- helmet upgraded 7 → 8; contentSecurityPolicy: false option unchanged
- jest + @types/jest bumped (dev-only, no runtime impact)
- TypeScript clean, Vite build passes, zero new errors

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mikrotik-manager-frontend",
-  "version": "0.11.10-beta",
+  "version": "0.11.11-beta",
   "private": true,
   "type": "module",
   "scripts": {
@@ -20,9 +20,9 @@
     "clsx": "^2.1.0",
     "date-fns": "^3.2.0",
     "leaflet": "^1.9.4",
-    "lucide-react": "^0.309.0",
+    "lucide-react": "^1.16.0",
     "react": "^19.2.6",
-    "react-dom": "^18.2.0",
+    "react-dom": "^19.2.5",
     "react-router-dom": "^6.21.1",
     "recharts": "^2.10.3",
     "socket.io-client": "^4.7.3",
@@ -32,7 +32,7 @@
   "devDependencies": {
     "@eslint/js": "^9.39.4",
     "@types/react": "^19.2.14",
-    "@types/react-dom": "^18.2.18",
+    "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^4.2.1",
     "autoprefixer": "^10.4.17",
     "eslint": "^9.39.4",